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ENGINEERED I-JOISTS PRODUCT MANUAL UPDATED MAY 2020 BUILDING BETTER FLOORS

BUILDING BETTER FLOORS · meyjoist - BuiLding Better FLoors meyJOISt is an engineered timber I-Joist supplied by Meyer timber® primarily used for floor and roof applications. available

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Page 1: BUILDING BETTER FLOORS · meyjoist - BuiLding Better FLoors meyJOISt is an engineered timber I-Joist supplied by Meyer timber® primarily used for floor and roof applications. available

Page 1

engineeredi-joists

P R O D U C T M A N U A LU p dat e d M ay 2020

BUILDING BETTER FLOORS

Page 2: BUILDING BETTER FLOORS · meyjoist - BuiLding Better FLoors meyJOISt is an engineered timber I-Joist supplied by Meyer timber® primarily used for floor and roof applications. available

Page 2 www.meyertimber.com.au

SEE IMPORTANT NOTICE AND WARNING ON PAGE 17

meyjoist rAnge

tABLe oF Contents

meyjoist - BuiLding Better FLoorsmeyJOISt is an engineered timber I-Joist supplied by Meyer timber® primarily used for floor and roof applications. available in long lengths, they are lightweight, easy to install and have generous web hole allowances for wiring, plumbing, and air conditioning ducting. this product manual contains all the information needed to specify and install a complete solution using meyJOISt. a separate meyJOISt Installation Reference Sheet is also available and includes common details and installation requirements in a handy double sided flyer.

QUALITy & PERFORMANCE• Technicalsupport–experiencedengineeringsupport, simply call your local Meyer timber® office.• ‘Offtheshelf’convenience–readilyavailable,exstock via a building merchant, simply cut to length and install.• Termite protected – meyJOIST incorporates H2-S termite protection across the range for areas of australia south of the tropic of Capricorn.

meyJOISt range & sizes 2

meyJOISt spans 3

typical floor layout 4

meyJOISt specification/installation 5

Supports 6

Intermittentblocking 7

Temporarytopflangerestraint 7

application of construction loads 8

meyJOISt support using hangers 9

meyJOISt set-downs for wet areas 10

NotchingandCutbackswithmeyJOIST 10

Web holes for meyJOISt 11

IHSmeyJOISTholesupport 13

Cantilevers for Balconies 14

Joists supporting parallel loadbearing walls 15

Method for framing cantilevers supporting 16 loadbearing walls

Lateral stability 16

Tiedowns 17

Productfaultsanddisclaimer 17

detail F1 - F22 18 - 22

meyJOISt for use as rafters 23

DetailR7-R26 24-26

Fireandacoustics 27

Software for floor design / meypLaN 28

Table 1: Dimension and Shape Figure 1: meyJOIST Sizes

MJ200 45 200 45 2.7MJ240 45 240 45 2.9

MJ240 63 240 63 3.7

MJ240 90 240 90 4.9

MJ255 63 255 63 3.8MJ300 45 300 45 3.3MJ300 63 300 63 4.0MJ300 90 300 90 5.2MJ360 63 360 63 4.4MJ360 90 360 90 5.6MJ400 90 400 90 5.8

Overall depth(mm)

meyJOIStSection Code

Flange Width (mm)

Mass (kg/m)

Spring: 1/1000Moisture content: 8-15%Depth: -0, +2mmWidth: -0, +3mm

Low Profile meyJOIST

Economy meyJOIST depth

Wet area set-down for MJ300

Most common meyJOIST depth

For larger span capabilities

Longest spanning meyJOIST

Flange Width 45mm 63mm 90mm

Jois

t dep

th

400m

m36

0mm

300m

m25

5mm

240m

m20

0mm

Page 2

Page 3: BUILDING BETTER FLOORS · meyjoist - BuiLding Better FLoors meyJOISt is an engineered timber I-Joist supplied by Meyer timber® primarily used for floor and roof applications. available

Page 3

meyjoist sPAns

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Information contained in this publication applies for floor joists used in residential applications. For more information refer to designIt® (or other) software. Use of software will provide a wider range of options and allow more optimum design.

DESIGN CRITERIA & LOADINGThe values given in these figures have been developed by experienced timber design engineers in accordance with AS1720.3:2016.ForotherdesigngeometryandloadingconditionsincludingallowablecantileversthefreedesignIT®(orother) software should be used for specification.

FLOOR RIGIDITyIntheselectionoffloorjoistsizesforagivenspan,specifiersshouldusetheabovemaximumjoistspansforguidanceandinadditiontakeintoaccounttheintendedoccupancyoruseofthefloor.Floorssupportingpartitionwalls,thoseconstructedusing more rigid flooring or including ceiling battens will have improved dynamic performance. these factors may also be takenintoconsiderationinselectionoffloorjoistsize.

Figure 2: meyJOIST Maximum Span Recommendations

Notes:1. Spans refer to ceiling attached to underside of meyJOISt, for ceiling not attached refer designIt® (or other) software.2.Continuousspanvaluesabovearebasedonamax15%variationorspancombinationtogive12mmaximumlength.3.Spansbasedon35mmendbearingand70mmintermediatebearinglengths.4. Spans for apartment floors do not apply to communal areas or corridors. Refer to software or contact Meyer timber® for more information

DOMESTICFLOORS

Joist Spacing450mm

Live Load: 1.5kPa/1.8kN

DOMESTICFLOORS

Joist Spacing 600mm

Live Load: 1.5kPa/1.8kN

APARTMENTFLOORS

Joist Spacing 450mm

Live Load: 2kPa/1.8kN

meyJOISTSection Code

meyJOISTSection Code

meyJOISTSection Code

SPAN (M)

SPAN (M)

SPAN (M)

Dead Load: 40kg/m2 (Normal Areas)

Dead Load: 40kg/m2 (Normal Areas)

Dead Load: 80kg/m2 (Normal Areas)

Dead Load: 100kg/m2 (Heavy Areas)

Dead Load: 100kg/m2 (Heavy Areas)

Dead Load: 150kg/m2 (Heavy Areas)

3.0 4.0 5.0 6.0 7.0 3.0 4.0 5.0 6.0 7.0

3.0 4.0 5.0 6.0 7.0 3.0 4.0 5.0 6.0 7.0

3.0 4.0 5.0 6.0 7.0 3.0 4.0 5.0 6.0 7.0

SINGLe SpaN

CONtINUOUS SpaN

MJ200 45MJ240 45MJ240 63MJ240 90MJ255 63MJ300 45MJ300 63MJ300 90MJ360 63MJ360 90MJ400 90

MJ200 45MJ240 45MJ240 63MJ240 90MJ255 63MJ300 45MJ300 63MJ300 90MJ360 63MJ360 90MJ400 90

MJ240 45MJ240 63MJ240 90MJ255 63MJ300 45MJ300 63MJ300 90MJ360 63MJ360 90MJ400 90

Page 4: BUILDING BETTER FLOORS · meyjoist - BuiLding Better FLoors meyJOISt is an engineered timber I-Joist supplied by Meyer timber® primarily used for floor and roof applications. available

Page 4

BrACkets: Fixing: FLooring:

haveagapbetweenjoistandbottomofbracket.A6gx30mmlongwaferheadscrewisrecommendedfrom underneath to pull joist down.

keep1-2mmgap at end.

secure joists to lower frames or sub-floor adequately to prevent movement.

use correct fasteners (consult flooring documentation).Screwsorringshanknails are highly recommended.

- apply adhesive in accordance with adhesive manufacturers recommendations.- Install flooring before adhesive formsaskin.-Completemechanicalfixingofthe sheetwithintheworkingtimeof the adhesive.- Follow the flooring manufacturers recommendations relating to gluing of sheet grooves.

fixinternal and external walls above to joists adequately to prevent movement.

skewnailjoiststobeams/ packersbeforeinstallingbrackets.

use adhesive sparingly or allow it to form askinpriortoflooringsheetinstallation. miss joists with fasteners so they

rub against the side of the joist.

HOW TO MINIMISE THE POTENTIAL SQUEAkS IN FLOOR SySTEMS

A handy 2-page meyjoist installation reference sheet is also available and can be supplied as a

hard copy to site upon request.

Connection to steelbeams (detail F4, page 18)

BracketsformeyJOIST(page 9)

Cantilevers for Balconies (page 14)

temporary restraint (page7)

meyJOISt web holes for services (page 11)

Cantilevers supporting loadbearing walls (page 16)

LateralRestraint(page7)and transfer of Bracing

Forces (page 16)

Bearing at supports(page 6)

tYPiCAL FLoor LAYout

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SQUeaKy FLOORSBROCHURE

INStaLLatIONREFERENCESHEET

Page 5: BUILDING BETTER FLOORS · meyjoist - BuiLding Better FLoors meyJOISt is an engineered timber I-Joist supplied by Meyer timber® primarily used for floor and roof applications. available

Page 5

meyjoist sPeCiFiCAtion / instALLAtion (General Requirements)

there are some aspects of both specification and installation that can be regarded by designers and builders as basic requirements. these should be adopted for installation in the absence of other or additional requirements that may be specified in the design documentation. Requirements that fit into this category are defined and detailed in this section called ‘General Requirements’.

Other aspects are categorised as ‘Installation details requiring design and specification’(pages14-17)becausetheyneedselectionand individual specification in the design documentation to ensure the design intent is communicated to the builder.

this product manual provides a variety of details specific to the use of meyJOISt floor systems for houses and similar buildings. details contained in this publication have been appropriately engineer designed and/or tested to determine their suitability. In addition, many details in aS1684 and other industry publications are equally applicable to meyJOISt as for conventionaltimberjoistedfloors–usethem.Wedohowever,cautionagainstanyassumptionthatdetailspublishedforother I-Joist products are suitable or sufficiently complete for use with meyJOISt.

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STORAGEPriortoinstallation,meyJOISTshouldbestackedonlevel bearers,atleast150mmclearofthegroundandkeptdry.

JOIST LAyOUTIn all cases it is assumed that installation will be carried out in accordance with a joist layout drawing showing the location, size(sectioncode)andmaximumspacingsofjoiststogetherwithreferencetoanyspecialrequirementsnotincludedinthisguide as ‘general requirements’.

JOIST PLACEMENTJoistsshouldbeaccuratelyplacedatnotmorethanthenominatedmaximumcentretocentrespacingsoastoprovidethesupport required for flooring and load bearing walls or posts. Joist placement must be so as to clear any obstructions that mayoccurthroughthefloorsuchasplumbing,drainagepipesorairconditioningductwork.

FIxING TO SUPPORTSJoistsaretobefixedaccuratelyinpositionatsupportsusingnailsorscrewsasperDetailF5.Nailthroughflangesusingaminimumof2/3.06Øx75mmlongnailsat least40mmfromtheendofthejoist.Screwsupto14g(6.3mm)x75mmlongcanalsobeusedforfixingtosupports.Whenusingscrewsitisstronglyrecommendedtopre-drilltheholewithadrillbitequivalenttothesizeofthescrewshanktopreventsplitting.Seealso‘Supports’sectioninthismanualforfurtherinformation.

FIxING OF SHEET FLOORINGItisrecommendedthatsheetflooringbesecuredtojoistsusingself-drillingType17screwsorring/twistshanknails.Nailsshould be 2.8mm diameter nails, hand driven or 2.5mm diameter nails, machine driven. Nail or screw spacing should be at centres recommended for the particular flooring type. Where nail centres are less than 50mm it is good practice to stagger their location so as to avoid the possibility of splitting. Flooring adhesive must used in conjunction with fasteners to minimize anychanceoflongtermfloorsqueak.

Table 2: Fixing of Sheet Flooring (Particleboard, OS’Floor, Plywood etc.)

Flooring Thickness: 15 - 22mm 25mmRecommended Nail/Screw Lengths: 50mm 65mmSimpson Strong-Tie® Quik Drive Screw Code: WSV50SA (10gx50) WSNTL212SA Complies to AS1860.2

HB Fuller Flooring Adhesiveswww.hbfuller.com.au

Strong Drive™ SUBFLOOR ScrewRibbed flat head, twin lead thread, sharp point.Yellowzinc.#3squaredriveorT25Torxdrive.8g x 32mm (WSC114SA)10g x 50mm (WSV50SA)8g x 65mm (WSNTL212SA)8g x 75mm (WSV3S)

Page 6: BUILDING BETTER FLOORS · meyjoist - BuiLding Better FLoors meyJOISt is an engineered timber I-Joist supplied by Meyer timber® primarily used for floor and roof applications. available

Page 6 www.meyertimber.com.au

suPPortsSupports shall be level, dry and have at least the rigidity implied by good framing practice and/or the design criteria specified for supporting components in aS1684. (a moisture barrier is recommended where support is directly to masonry orbrickwork).BracketsavailableforusewithmeyJOISTarelistedin table 4.

JOIST INSTALLATION TOLERANCESFigure 3: Install Joists Plumb

Figure 5: Blocking and Bearing at Supports

Table 3: Blocking and Bearing at Supports

Figure 4: Install Joists Straight

BLOCkING & BEARING AT SUPPORTS (FOR GRAVITy LOADS)

SUPPORT ON FULL meyJOIST FLANGE WIDTH.USE FULL SUPPORT WIDTH WHERE POSSIBLE.

Required Bearing (mm)End Supports

Sheet Roof

Tile Roof

Sheet or Tile Roof

≤ 450mm Joist Spacing 600mm Joist Spacing 600mm Joist Spacing≤ 450mm Joist SpacingIntermediate Supports (continuous spans)Load at Supports

Floor Loads Only

Concentrated loads from jamb studs or posts

Floor loads plus compression load from a two storey load bearing wall

supporting roof and upper floor

Floor loads pluscompression load from a

single storey load bearing wall supporting roof only

*Orprovidebearingasforjoistssupportingfloorloadsonlyandinstallcontinuousblocking,‘rimboard’orboundaryjoisttosupportroofandwallloads

Inadditiontotheabove,installcompressionblocksasperDetailF18

InstallcontinuousmeyJOISTblocking

InstallcontinuousmeyJOISTblockingInstallintermittentblockingorequivalent*-See Figure 6

Installintermittentblockingorequivalent-See Figure 6≥ 30mm ≥ 30mm ≥ 45mm

≥ 45mm≥ 45mm*

≥70mm*

≥70mm*

≥ 90mm*

≥70mm

≥70mm

≥70mm ≥70mm≥70mm ≥70mm

Maximum1mmper 300mm joist depth

FloorLoadsOnly

endSupport

endSupport

endSupport

endSupport

FloorLoadsOnly

IntermediateSupport

IntermediateSupport

FloorLoadsOnly

≥ 30mm ≥ 30mmeach joist

45-70mm

ContinuousBlocking

Floor + Single Storey Walland Roof Loads

Floor + Single Storey Walland Roof Loads

IntermittentBlocking

45-70mm 45-90mm

Straight to within 1mmper metre of span

See Table 3 for bearing requirement based on loading/spacing as well as double storey and concentrated load supports.

• Bearingshouldbeprovidedtothefullwidthofthe meyJOISt bottom flange.• It is good practice to bear over the maximum available width of supports.• Use of web stiffeners can reduce the required bearing however this needs to be specified in the design documentation.• Continuous blocking provides support for load bearing walls directly aligned above supports. at end supports,‘rimboard’orboundaryjoistscanbeused asanalternativetocontinuousblockingtosupporta load bearing wall.• designIT® (or other) software may give reduced bearing requirements for specific cases.

Page 7: BUILDING BETTER FLOORS · meyjoist - BuiLding Better FLoors meyJOISt is an engineered timber I-Joist supplied by Meyer timber® primarily used for floor and roof applications. available

Page 7 www.meyertimber.com.au

the fundamental requirement is to install joists plumb and hold them upright at supports.Thesimplestandmosteffectivewayofachievingthisistoinstallsquare cut meyJOIST blocking but alternative methods suchas the use of ‘rimboard’, boundary joists, metal strap/brace orplywood closures are acceptable. Installation of these is shown inDetailsF1,F2,F3andF17.

Note:Intermediateblocking(midspan)isnotrequiredandcanbeasourceofannoyingnailcreaksinthefinishedstructure.

Forbestperformance,thetopflangeofmeyJOISTshouldbeheldstraightbetweensupports–(nomorethan1mmpermetreof span deviation from straight).

Beforeloadingjoistsandattachmentofflooring:• Installblocking(orequivalent)atsupportsasdescribedabove,andbetweensupports,installtemporarybattensbraced backtoapointofrigidity(nomorethan2.5metresapart)toholdthetopflangeofeachjoiststraightbetweensupports.• Forinstallationofflooring,progressivelyworkacrossthefloorremovingbattensasrequired.

Ifthereisnoflooringorwallplatetorestrainthetopflangepermanentlyatsupportpointstheneithercontinuousblocking,rimboardorboundaryjoistsarerequired,orapermanentbattenfixedtothetopofthejoistswith2/3.06Øframingnailsatevery joist.

Figure 6: Intermittent Blocking (or Equivalent) at Supports

Figure 7: Temporary top flange restraint

Maximum1800mm*Nail wall plates or flooring to each joistandtoeachblockingpieceFlooring

temporary BattenBlocking(orequivalent)

at supports

Bracketsaresuitableforproviding restraint

2.5mm

aximum

2.5mm

aximum

Wall plate or

temporary Batten

Blockingatintervalsnotexceeding1800mm* along the line of support

Blockingorequivalenttojoistsat or near the edges of the floor

*Blocking in pairs at 3600mm maximum spacing is equally acceptable

interMittent BLoCking (or equivalent)

teMPorArY toP FLAnge restrAint

Page 8: BUILDING BETTER FLOORS · meyjoist - BuiLding Better FLoors meyJOISt is an engineered timber I-Joist supplied by Meyer timber® primarily used for floor and roof applications. available

Page 8

MATERIAL STACkED OVER LOADBEARING WALLS UNDER:-Supportstohaveblockinginstalledover.- Loadbearing walls to be perpendicular to joists.- Material to be perpendicular to joists.- Material to be located centrally over support wall.-Quantityaspermaterialguidancex2.5.

MATERIAL GUIDANCE:Maximumstackedmaterials:- 15 sheets of 19mm particleboard flooring.-18sheetsof18mmOS’FLOOR.-27sheetsof10mmplasterboardlining.-Othermaterialsuptoamassof200kg/m2

MATERIAL PERPENDICULAR TO meyJOIST AWAy FROM SUPPORTS

MATERIAL PARALLEL TO meyJOIST AWAy FROM SUPPORTS

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APPLiCAtion oF ConstruCtion LoAds

meyJOISt floor systems will be required to support short term loads during construction for items such as materials (sheet flooring, plasterboard, tiles, etc.) or tools. Once the joists have been erected in accordance with the meyJOISt installation referencesheetorthismanual,lateralrestraintblockinghasbeeninstalled,andfloorsheetingortemporarybattensareinplace, short term loads can be applied. the best location to place heavy items of material is directly over internal loadbearing walls underneath. Where this is not possible, construction loads can be located as shown in Figure 8 below.

WARNING: Lateral Restraint blocking and Floor sheeting (or temporary battens)MUST be installed before applying any construction loads.

Support wall

Support wall

Support wall

Support wall

Figure 8: Application of Construction Loads

temporary battensor floor sheetinginstalled

temporary battensor floor sheetinginstalled

Parallelstackedmaterialrequirements:- Loaded on bearers spaced at 600crsmaximum.- Bearers to span minimum 4 joists.- Bearers to be temporarily secured to all joists.- Quantity as per material guidance below.-Nomaterialtobestackedon joists supported by hangers.

Perpendicularstackedmaterialrequirements:- Material to span minimum 2 joists.- Quantity as per material guidance below.-Nomaterialtobestackedonjoists supported by hangers.

Blocking(or equivalent)at supports

Blocking(or equivalent)at supports

CONStRUCtION LOadFACTSHEET

pReFaB It CaSSetteFLOORBROCHURE

Page 9: BUILDING BETTER FLOORS · meyjoist - BuiLding Better FLoors meyJOISt is an engineered timber I-Joist supplied by Meyer timber® primarily used for floor and roof applications. available

Page 9

BracketCode

BracketCode

JD4 DESIGN CAPACITy Nd,j (kN)

JD4 DESIGN CAPACITy Nd,j (kN)

NaILS

NaILS

NaILS

SCReWS

SCReWS

FixingtoBearer

Floor live load case

Floor live load caseFixingtoBearer

All IJT Hangers 6 6.1

MH5090 8 4 5.7 6.1 MH50120 14 6 9.9 9.1 MH50140 16 8 11.3 12.1 MH50180 22 10 15.0 15.0 MH50220 26 12 15.0 15.0 MH70135 16 8 11.3 12.1 MH70235 28 12 15.0 15.0

meyJOISTSection

Code

Top Mount Hanger Code7

Face Mount Hangers

Numberof Nails toBearer1,2,3

Full Depth Hanger Code4

Partial Depth Hanger Code4,5

MJ200 45 8 IJF20050 MH50140 IJT20050 MJ240 45 10 IJF24050 MH50180 IJT24050 MJ240 63 10 IJF24065 MH70235 IJT24065 MJ240 90 10 IJF24090 FB90200* IJt24090 MJ255 63 10 IJF24065 MH70235 N/A MJ300 45 12 IJF30050 MH50220 IJT30050 MJ300 63 12 IJF30065 MH70235 IJT30065 MJ300 90 12 IJF30090 FB90200* IJt30090 MJ360 63 16 IJF36065 MH70235 IJT36065 MJ360 90 16 IJF36090 FB90200* IJt36090 MJ400 90 N/a N/a FB90200* Lt400/90*

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meyjoist suPPort using HAngers

Table 4: Joist Hangers for meyJOIST

Notes:1.NailingspecifiedisforbracketsfacefixedtoJD4(orbetter)timberbearerorwalingplate.2.Bracketstobeinstalledstrictlyinaccordancewithbracketmanufacturers’recommendations.3.NailsforMH,IJF,andIJTserieshangerstobe3.75Øx35mmlongflatheadnails.4.12gx35mmlongType17HexheadscrewsaresuitabletobeusedforIJFseriesbrackets.Use50%ortherequirednails(4minimum)todevelopequivalenthangercapacities. SeeTable7forMHseriesbrackets.5.Partialdepthfacemounthangerstobeinstalledwithwebpacking-installasforwebstiffenersreferDetailF6.6.NailingspecificationappliesforjoistsusedinhousessupportingflooronlywithfloorDeadLoadnotexceeding100kg/m2.7.Topmounthangerspanlimitedto6.6m(40kg/m2)or5.4m(100kg/m2)atmaximum600ccspacingsupportingfloorloadsonly.8.Bracketsmarkedwith*areavailablefromPryda.

HangerCapacitytablenotes:1.Table4notesaboveapplyforTable5,Table6,andTable7.2.DesignCapacityValuesarefor1.2G+1.5Qloadcase(k1=0.69).3. Refer Meyer timber® for other load cases and joint groups.

Figure 9: Joist Hangers

Table 5: Face Mount I-Joist Hanger Capacities

Figure 10: Angle Bracket for Oblique Joists

Table 6: Top Mount I-Joist Hanger Capacities

Table7: Partial Depth Joist Hanger Capacities

Face mount (IJF) JoistHanger

top mount (IJt)JoistHanger

PartialHeightJoistHanger Fixthroughbracket

into bottom flange

Fixtopflangeto beam

Meyer timber®AngleBracket

BracketCode

JD4 DESIGN CAPACITy Nd,j (kN)NaILS

FixingtoBearer

Floor live load case

IJF20050 8 5.7 IJF24050 10 7.1 IJF24065 10 7.1 IJF24090 10 7.1 IJF30050 12 8.5 IJF30065 12 8.5 IJF30090 12 8.5 IJF36065 16 11.3 IJF36090 16 11.3

Page 10: BUILDING BETTER FLOORS · meyjoist - BuiLding Better FLoors meyJOISt is an engineered timber I-Joist supplied by Meyer timber® primarily used for floor and roof applications. available

Page 10

meyjoist set-downs For wet AreAs

notCHing And Cut BACks witH meyjoist

meyJOISt section sizes can be used to create set-down areas and allow for fall in the finished surface to prevent ponding within the building envelope. this is most common in regions such as bathrooms.

the MJ255 63 has been specifically designed to compliment the 300mm deep meyJOISt range for this purpose. the set-down area rarely occurs over the full length between supports so those sections utilizing the set-down joist which are outside thewetareaneedtoberaised.TheMJ25563allowsforastandard45mmpackertobeusedtoachievethis.

Meyer timber® has the production capability to detail and manufacture these set-down joists. By chemically bonding the packerasrequiredtotheset-downjoistinthefactorytherewillbelittlechanceoffuturesqueaksorseparation.Alternatively,thepacking canbe supplied loose and installedon site. Caremustbe taken toensure that sufficient adhesive isusedbetween thepackerandset-down joist topreventanychanceof squeaks. It isalso recommended that longerflooringfastenersareusedforsiteinstalledpackerstoensurepenetrationthroughthepackerintotheset-downjoist.Alternativelythepackershouldbescrewedtotheset-downjoist.

Flanges may not be notched, planed or bored exceptasnotedbelow:

1. at end supports only, one or both flanges maybenotchedtoamaximumdepthof 12mm(perflange)asshowninDetailF7.

2. at end supports flanges may be chamfer cut but not beyond the line of the support.

3. Donotboreholesthroughflanges.Holes up to 6mm for installation of nails or screws at supports are allowed.

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Table 8: Set-down Joists Figure 11: Set-down for 300mm Floor Depth

200mm N/a N/a240mm 200mm 40 (ripped)300mm 255mm 45 (standard)360mm 300mm 60 (ripped)400mm 360mm 40 (ripped)

meyJOISt Set-down depth

meyJOIStFloor depth

PackerThickness(mm)

70x45Packer

33x45Packer

Set DownArea

MJ300 45

MJ300 45

MJ255 63MJ255 63MJ255 63

Figure 12: Flange notching

Figure 13: Notching/Cut Backs/Holes with meyJOIST

DO NOT OVERCUT

Flange notching to occur at end supports only

≤ 12mm

≤ 12mm

≤ 12mm

≤ 12mm

≤ 12mm

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weB HoLes For meyjoistHolesmaybecutthroughthewebofmeyJOISTprovidedtheyarelocatedwithinthecentralpartofthespanasspecifiedusing Figure 14, in conjunction with tables 9, 10 and 11. the tables specify allowable hole locations for some sizes of circular and rectangular holes. these limitations should be assumed to apply in the absence of alternative specification in the design documentation.

For particular load and support conditions or other hole sizes and shapes, alternative allowable hole positions may be specified using the designIt® or other software.

Figure 14: Circular and Rectangular Holes

Table 9: Circular Holes at 450mm Joist Spacing

Notes:1.Tableappliesforfloorjoistssupportingfloorloadsonlynotexceeding100kg/m2deadloadand1.5kPa/1.8kNliveload.2. “Intermediate” refers to internal supports of continuous span joists. all other cases shall be treated as “end” supports.3.Holelocationsclosertosupportsmaybepossibleforsomeloadandsupportconditions;refertodesignIT®(orother)software.4. General hole information to be adhered to as detailed in Figure 14 of meyJOISt product Manual.5. Values not applicable for joists supporting large concentrated loads - refer designIt® (or other) software.

No holes over 40mmin red zones

endsupport

endsupport

300

yX

y

D L H

X

300 300300 300Min

Larger of2d or 2L Intermediate

Support

Cantilever

Maximum40mmholein cantilever span

40mm holes allowed incentre of web with 100mmbetween holes

25mm holes allowedanywhere in web with50mm between holes

NO MORE THAN 3 HOLES ABOVE 75mm IN ANy ONE SPAN

meyJOISTSection

Code

MJ200 45 122

177

282

5.8

322

5.9

6.46.7

162

222

MJ240 45

MJ240 63

MJ240 90

MJ255 63

MJ300 63

MJ300 90

MJ360 63

MJ360 90MJ400 90

MJ300 45 4.9

5.3

Span(m)

MaximumHole

Diameter(mm)

Span(m)

Min. Distance ‘X’ from End Supports (mm)Hole Diameter (mm) Hole Diameter (mm)

Min. Distance ‘Y’ from Intermediate Supports (mm)

80 80110 110125 125150 150

3.03.6

3.6

4.0

4.3

3.6

4.2

4.7

3.5

4.0

5.0

4.0

4.5

4.9

300

300 N/S N/S

300

300

300

500

700

300

700800900

700

900

1100

700

900

1200

300300600

1000 1300

300 300

600

400 800

300 600

500 900

900 1300

500 900

800 1200

1200 1600

300

300

450

600 900

12001450

1700

1500

170020001700

1950

2300

850

1200

1700

300

500

300

650

300

600

900

3.5

4.1

4.0

4.5

4.9

4.5

5.0

5.6

5.0

5.5

6.1

4.5

5.0

5.8

5.5

5.9

5.5

6.3

5.5

6.0

6.7

6.8

7.3

7.7

Holeslargerthan32mmdiameteraretobecentredwherepossiblewiththeholeedgeaminimumof3mmawayfromtheflange.

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Page 12

meyJOISTSection

Code

MJ200 45 122

177

5.4

322

282

300

300

300

6.0

5.5

6.3

300

700

162

222

MJ240 45

MJ240 63

MJ240 90

MJ255 63

MJ300 63

MJ300 90

MJ360 63

MJ360 90

MJ400 90

MJ300 45 4.6

4.9

Span(m)

MaximumHole

Diameter(mm)

Span(m)

Min. Distance ‘X’ from End Supports (mm)Hole Diameter (mm) Hole Diameter (mm)

Min. Distance ‘Y’ from Intermediate Supports (mm)

80 80110 110125 125150 150

3.0

3.3

3.3

3.6

3.9

3.6

4.0

4.3

4.0

4.4

4.7

3.5

4.0

4.5

300

300

N/S N/S

300

300

300

300

300300

300300

600

700

300600

300

500

800

300

300

300

700 800 1000

300

300 900

1000

500 1100

300

300 1000

600 1200

400 700 1300

300

650

400 700 1250

300

700

300 500 1000

600 900 1450

300 900 800 1400

1100 1700

500 1200

1100 1700

1600 2100

800 1400

1400 1950

1900 2400

700

800 1300

1400 1900

300

600

300

300

600

300

500

900

300

400

900

1300

300

450

800

300

800

1300

500

1100

1600

300

500

1100

3.0

3.9

3.0

4.0

4.6

3.5

4.5

5.2

4.0

5.0

5.7

3.5

4.5

5.4

4.5

5.0

4.0

5.0

5.9

4.0

5.0

5.5

6.3

5.4

6.5

6.1

6.9

7.2

3.54.04.54.94.04.85.34.55.05.55.85.05.55.95.06.06.46.06.7

4.55.05.55.95.05.56.35.05.56.06.75.56.06.85.56.57.36.57.7

3.03.54.04.64.04.54.94.04.55.05.44.55.05.55.05.56.06.06.3

3.04.04.55.04.05.05.94.05.05.56.35.05.56.55.06.06.96.07.2

8001200145017001200145023501200145018002100500750950300450750

300

5001000500750950500750

10001200

300

600

300950

12501600950

16002200950

1600190023507009501700300950

1350550900

300

400550300500700450600850

1000

Table 10: Circular Holes at 600mm Joist Spacing

Table 11: Rectangular Holes (200mm high x 300mm long or smaller)

Notes:1. table applies for floor joists supporting floor loads only not exceeding100kg/m2 dead load and 1.5kPa/1.8kNliveload.2. “Intermediate” refers to internal supports of continuous span joists. all other cases shall be treated as “end” supports.3.Holelocationsclosertosupportsmay be possible for some load and support conditions;refertodesignIT®(orother) software.4. General hole information to be adhered to as detailed in Figure 14 of meyJOISt product Manual.5. Values not applicable for joists supporting large concentrated loads - refer designIt® (or other) software.6.Maximumholeheights: MJ300 = 222mm MJ360 = 282mm MJ400 = 322mm

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Joist Spacing 450mm Joist Spacing 600mmmeyJOIST

SectionCode

Span (m) Span (m)Span (m) Span (m)Distance x (mm) Distance x (mm)Distance y (mm) Distance y (mm)

Min. Distance ‘Y’ from Intermediate Supports (mm)

Min. Distance ‘Y’ from Intermediate Supports (mm)

Min. Distance ‘X’ from End Supports (mm)

Min. Distance ‘X’ from End Supports (mm)

MJ300 45

MJ300 90

MJ300 63

MJ360 63

MJ360 90

MJ400 90

Notes:1.Tableappliesforfloorjoistssupportingfloorloadsonlynotexceeding100kg/m2deadloadand1.5kPa/1.8kNliveload.2. “Intermediate” refers to internal supports of continuous span joists. all other cases shall be treated as “end” supports.3.Holelocationsclosertosupportsmaybepossibleforsomeloadandsupportconditions;refertodesignIT®(orother)software.4. General hole information to be adhered to as detailed in Figure 14 of meyJOISt product Manual.5. Values not applicable for joists supporting large concentrated loads - refer designIt® (or other) software.

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Page 13

iHs - meyjoist HoLe suPPortWhere holes are required to be located in areas not normally permitted using the standard tables, meyJOISt members can potentiallybestrengthenedusingIHSholesupportbrackets:

• ForusewithMJ240andMJ300seriesmeyJOIST.• Suitablewheretheedgeofaholeisonly50mmfromthefaceofthesupport(orasnotedinTable12).• Suppliedinasetof2tobeusedonbothsidesofasinglejoistorasinglesideoftwojoists.

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Table12showsallowabledistancesfromsupportsforIHSbracketsusedindomestichouses.ContactMeyerTimber®foranyvariations to loading, spans or distances not shown.

Table 12: Minimum Allowable Distances (mm) for IHS Reinforced Holes

Notes:1. “Intermediate” refers to internal supports of continuous span joists. all other cases shall be treated as “end” supports.2.ValuesinbracketsrefertodoubleIHSconfiguration.OthervaluesrefertosingleIHSconfiguration.3.100kg/m2valuestobeusedunderwetareas.40kg/m2 values to be used in other cases.4.Theabovevaluesarebasedonthemaximumspanthateachjoistcansupportwithmaximumholesizeasnoted.5. allowable distance is measured from inside of support to edge of hole.6. Values not applicable for joists supporting large concentrated loads - refer designIt® (or other) software.7.Alldimensionsinmm.

INSTALLATION• EachIHSconsistsof2setsofinterlockingplateswhichcanbeusedonasinglesideoronbothsidesofameyJOISTmember.• Theouteredgeoftheholemustbeatleast50mm(orasnotedintheTableabove)fromtheinsidefaceofthesupport.• HolescanbecutintothemeyJOISTwebbeforeorafterinstallationoftheIHS.• HolesmustfitwithintheinternalapertureoftheIHS(maximumholelength250mm).• OpenorclosetheIHStotherequiredwidth,ensuringthatthetwosectionsoverlapbyatleastonerowofnails (minimum overlap of 45mm).• PlacetheIHSontothemeyJOISTsothatthetopandbottomslidingflangesarealignedverticallycentralontothetop and bottom flanges of the meyJOISt.• IHStabsshouldbefacingoutwards.• Install3.75Øx35mmlongmeyJOISTconnectornailsthroughallroundholesintothetopandbottomflangesofthe meyJOISt.• RepeattheabovestepsontheoppositefaceifadoubleIHSisrequired.

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STANDARD FLOOR (Dead Load = 40 kg/m2, Live Load = 1.5kPa/1.8kN)

HEAVy FLOOR (Dead Load = 100 kg/m2, Live Load = 1.5kPa/1.8kN)

MJ240

MJ240

MJ300

Support1 Maxholesize(dxw)

450mm joistspacing

600mm joistspacing

600mm joistspacing

450mm joistspacing

Maxholesize(dxw)Support1

end (X) 50 200 (50)

500 (50)150 (50)

5050

800 (50)

1150 (400)

1600 (1000)

1350(700)

5050850 (50)

750(50)

1300 (600)

150x250

150x250

200x250

200x250

end (X)

end (X)

end (X)

Intermediate (y)

Intermediate (y)

Intermediate (y)

Intermediate (y)MJ300

Overlappingplate installed

Overlapping plates on both sides of the joint installed

50mm from the face of the bearing to the hole edge

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CAntiLeVers For BALConiesBalconycantilevers,subjecttoexternalweatherexposurecanbeprovidedusingH3preservativetreatedoutriggersasperdetails F11 and F12. For weather proofed applications meyJOISt may be cantilevered to provide balcony support as per detail F13.

Outriggers can be seasoned stress-graded timber or Mt-LVL, either nested against the meyJOISt web and bearing on the top of the bottom flange or placed adjacent to the meyJOISt bearing directly on the support. diagrams illustrating these configurations are shown below. It is strongly recommended that outriggers be H3 preservative treated regardless ofwhether the balcony is weather protected or not.

Someoptionsforoutriggersareincludedinthefollowingtable.ThesehavebeendeterminedusingmaximummeyJOISTspanswithadeadloadof100kg/m2andliveloadof2kPa/1.8kNonthebalconycantilever.Forotherfloorloadsorpotentialoutrigger sizes refer to designIt® or other software.

Table 13: Cantilevers for Balconies

Figure 15: Cantilevers for Balconies

H3preservativetreated

Outrigger

end trimmer

Blocking

Waterproofmembrane/flashing

and painting/stainingrecommended

Singledouble

External Outrigger

Adjacent Outrigger

Nested Outrigger

(Adjacent Outrigger configuration shown)

Outrigger Options

Nested Outrigger (Detail F12)Maximum Balcony

Cantilever (m)Joist Spacing

(mm)meyJOIST section

200mm deep meyJOIStMJ200 45

240mm deep meyJOIStMJ240

300mm deep meyJOIStMJ300

360mm deep meyJOIStMJ360

400mm deep meyJOIStMJ400 90

Adjacent Outrigger (Detail F11)

450 0.8

600 0.7

450 1.1600 1.0450 1.4600 1.3450 1.7600 1.6450 2.0600 1.9

2/90x45F7H3 140x45F7H3

2/140x45F7H3 190x45F7H3

2/190x45F7H3 240x45F7H3 2/240x45F7H3 290x45F7H3 2/290x45F7H3 Notrecommended

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Page 15

meyJOIST Section

Code

Tile Roof and Ceiling (90 kg/m2)Roof Load Width

Maximum Single Span (m) Maximum Continuous Span (m)1.8m 1.8m3.6m 3.6m6.0m 6.0m

MJ200 45

MJ240 45

MJ240 63

MJ240 90

MJ255 63MJ300 45MJ300 63

MJ300 90

MJ360 63MJ360 90MJ400 90

2.2 1.6 N/S 2.0 1.3 N/S 2.7 2.2^ 1.4^ 2.7# 1.7# N/S

3.0 2.1 1.4 2.7 1.7 N/S

3.3 2.4 1.6 3.1 1.9 1.3

3.2 2.3 1.5 3.0 1.8 1.2

3.1 2.5^ 1.9* 3.3# 2.0# 1.3#

3.5 2.9^ 1.9^ 3.7# 2.3# 1.5#

4.0 3.3 2.2 4.2# 2.6# 1.8#

4.1 3.3* 2.4* 4.6# 2.9# 1.9#

4.5 3.7* 2.7* 5.3# 3.3# 2.2# 4.8 4.0* 2.9* 5.7# 3.6# 2.4#

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joists suPPorting PArALLeL LoAdBeAring wALLsIn some instances meyJOISt members will be located directly under loadbearing walls and are required to support single storey wall and roof loads. table 14 and table 15 below provide allowable spans for both sheet and tile roof support. For other circumstances such as using double meyJOISt sections or for support of two storey floor and roof loads refer to designIt® (or other) software. the tables below dO NOt apply where girder trusses or jamb stud loads from large openings are supported on floor joists. Contact the Meyer timber® design office for advice.

Table 14: Joist Supporting Parallel Load Bearing Walls – Sheet Roof

Table 15: Joist Supporting Parallel Load Bearing Walls – Tile Roof

Notes:1.Suitable for floor dead load to 100kg/m2 (1.5kPa/1.8kN live load)andmaximumjoistspacingof600mm.2.Minimum45mmendbearingor70mmintermediatebearing unless noted ^(90mm bearing) or #(70mm bearing + web stiffeners).3.Webstiffenerswhererequiredaretobeinstalledinaccordance with detail F6.4. Continuous span bearing for intermediate supports only. For end supports of continuous spans use single span bearing values.5. Suitable for Wind Classifications up to and including N3.

Notes:1.Suitable for floor dead load to 100kg/m2 (1.5kPa/1.8kN live load)andmaximumjoistspacingof600mm.2.N/Sindicatesmaximumspanislessthan1.2m.3.Minimum 45mm end bearing or 70mm intermediate bearing unless noted ^(90mm bearing) or *(45mm bearing+webstiffeners)or#(70mmbearing+webstiffeners).4.Webstiffenerswhererequiredaretobeinstalledinaccordance with detail F6.5. Continuous span bearing for intermediate supports only. For end supports of continuous spans use single span bearing values.6. Suitable for Wind Classifications up to and including N3.

meyJOIST Section

Code

Sheet Roof and Ceiling (40 kg/m2)Roof Load Width

Maximum Single Span (m) Maximum Continuous Span (m)1.8m 1.8m3.6m 3.6m6.0m 6.0m

MJ200 45

MJ240 45

MJ240 63

MJ240 90

MJ255 63MJ300 45MJ300 63

MJ300 90

MJ360 63MJ360 90MJ400 90

2.7 2.3 1.9 3.1 2.2 1.6 3.2 2.7 2.4 4.1# 2.9# 2.1#

3.5 3.0 2.6 4.1 2.9 2.1

3.9 3.4 2.9 4.8 3.4 2.4

3.7 3.2 2.8 4.6 3.2 2.3

3.8 3.3 2.8^ 4.8# 3.5# 2.5# 4.2 3.6 3.1 5.2# 3.9# 2.8# 4.6 4.1 3.6 5.7 4.6# 3.3# 4.7 4.2 3.7^ 5.8# 5.0# 3.6# 5.1 4.6 4.1 6.2# 5.7# 4.2# 5.4 4.9 4.4^ 6.5# 6.0# 4.4#

Pre-FABriCAted meyjoist AVAiLABLe tHrougH MeYer tiMBer®

Meyer timber® has the detailing and fabrication ability toprovideprecisiondocked to lengthmeyJOISTdirect tosite. With further builder co-ordination any holes through meyJOISt and LVL beams can be assessed and included. Based on builder location preference, the design of penetrations is done in-house to ensure large hole are in suitablepositions.Holescanincludeverticallyslottedholestoallowfordrainagefall,roundholesforexhaustventsandround/rectangular holes for air conditioning ductwork.Contact Meyer timber® directly for more information.

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MetHod For FrAMing CAntiLeVers suPPorting LoAd BeAring wALLsSome or all of meyJOISt cantilevered to support a load bearing wall may require reinforcement. this requirement needs to be considered in design and specified in the design documentation. details for reinforcement are given in details F21 and F22.

Regardless of whether reinforcement is required or not, cantilevers with span greater than the joist depth are to be installed withcontinuousblockingatthecantileversupportandatrimmingjoist(orequivalent)providingloaddistributionattheendsofthecantileveredjoists.Theuseofatrimmingjoisthelpstobothstiffenthecantileverandlimitlongtermdifferentialdeflections. For installation see detail F15 or detail F15a.

Short cantilevers (LC<d)mayneedreinforcementbutintermittentblockingonlyisneededatthecantileversupportandthetrimmingjoistneednotbeincluded–seeDetailF14.

LAterAL stABiLitYLateralwindandearthquakeforcesdeterminedfortheupperstoreymustbetransferredthroughthefloortothetopplate(andthebracingsystem)ofthelowerstorey.Wheretheseforcesareperpendiculartothedirectionofjoists,intermittentblockingorthefixingsto‘rimboard’orboundaryjoistsmaynotbeadequatetotransferthefullextentoftheforces.Toachievethetransferoflateralforcesitisrecommendedthatsufficientblockingbeinstalledtoresistrackingforcesfromthebracingunits.Figure18showsanexampleofhowtotransfertheseloadsthroughthefloordepthforhighcapacitybracingsystems.

Figure 16: Method for Framing Cantilevers Supporting Load Bearing Walls

Figure 17: Racking Loads

Laodbearing wall

dd

Loadbearing wall

Intermittentblocking

Short Cantilever (See Detail F14)

Racking loadsneed to betransferredthrough floorsto the lowerstorey wallbracing system

Long Cantilever (See Detail F15 or F15a)

Continuousblocking

Lc > dLc < d

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Page 17

tie-downIn general, tie down details applicable for solid timber joists asspecifiedinAS1684canalsobeusedwithmeyJOISTexceptthat bolting through the flanges of meyJOISt is not permitted.

detail F9 shows how internal bracing walls may be tied down to a meyJOISt floor system.

PRODUCT FAULTS

Faults in manufacture do sometimes occur and faulty product may from time to time reach the market despite eventhe most stringent controls of the manufacturing process and quality. Please let us know if you receive any productthat you have concerns with – call your local Meyer Timber® office even if you have solved the problem and a claim‘is not worth the hassle’.Wewant toknowso thatwecandobetter.Better still,email thesupport linewithanyqueriesat: [email protected] (VIC/taS) or [email protected] (NSW/aCt/QLd).

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Figure 18: Example of Continuous Blocking and tie-down for high capacity bracing units (eg. > 3.4kN/m)

DO NOTbolt throughmeyJOISTflanges

Securebottomplatetoblockingas per aS1684 requirements

Tie-downsatextremitiesofupper storey bracing panels

Secureblockingtotopplate to match capacity of upper storey bottom plate toblocking

IMPORTANT NOTICE AND WARNING: While the products in this document possess the characteristics described, no representation is made that the products will be effective in all locations and circumstances. Much depends upon building design, construction practices and the environment in which the products are used. Statements about the attributes and performance characteristics of the products are made on the assumption that the products are properly stored, handled, installed, used and maintained in their relevant application. You should not rely solely on this document when using meyJOIST. Meyer Timber® recommends obtaining professional building advice which takes into account your particular circumstances and site conditions. Failure to install meyJOIST products in accordance with applicable building regulation requirements and instructions may lead to personal injury, loss or damage and may adversely affect the performance of the products.

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Detail F1

Blocking with meyJOIST

meyJOISTblockingsecured using minimum3/3.06Øx75mmlongframing nails topand bottom

Upperwallplate/battenfixedtojoistsand/orblocking

Detail F2

Blocking with steel strapping

Upper wall plate/battenfixedtojoists

Fixstrappingwith3/2.8Øx30mmlongconnector nails tojoist and supports

30x0.8mmgalvanised steelstrap (or equivalent)

Detail F3

Sheet bracing secured towall plates or battens using2.5Øx30mmlongflatheadnails at 150mm centres

Sheet bracing length to beminimum 2 joist spacings

Upperwallplate/battenfixedtojoistsand/orblocking

Detail F4 70x35(min)packerfixedtotopofsteel

Webstiffenerfixedusingnails(not screws)

Face mount (IJF)joist hanger

Steel Beam

top mount (IJt)joist hanger

35mmthick(min)solid timber cutneatly betweensteel flanges andfixedtopackers

allowablesheetbracing:-7mmF8Plywood- 4mm F22 plywood-4.8mmHardboard-6mmOS’Brace

70x35(min)packersfixedto steel

partial heightjoist hanger

Hanger fixing options for meyJOIST to steel

Detail F5

Blocking with sheet bracing

Fixing at supports

Minimum 40mmend distance

ensure adequatebearing length

3.06Øx75mmlongframingnailsthrough flanges. typical one each side of web

Web stiffener installation

Double joist web stiffenersOther notes as per Detail F6

Detail F6 Detail F6a

3mm gap

Nail/Screwboth webs tostiffener

Minimum webstiffenerthicknessistwice that given fordetail F6

No gap

3.06Ø clenchnails or 12gType17Hexhead screws

meyJOISt flange width 45 63 90Stiffenerthickness 18 27 393.06Ønaillength 50 75 10012g screw length 45 65 90(14g)

≤300 deep use 3 nails or 2 screws each side>300 deep use 4 nails or 3 screws each side

Page 18

Note:Alldimensionsinmm.

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12mm(maximum)

12mm(maximum)

Steel

do not tapercut joist pastline of support

meyJOIST flange notching

DO NOT OVERCUT

Flange notching to occurat end supports only

Notch must end within 5mm of support

Detail F8

meyJOIST web notching for steel

≤300 deep use 4 nails or 2 screws each side>300 deep use 5 nails or 3 screws each side

Notch as perDetailF7permissible

portion may be removedwithin line of support only

No gap

3mm gap

Steel

3.06Ø clench nails or 12gType17Hexheadscrews as per detail F6

Maximum1/2joist depth

Detail F7

Detail F9

Internal bracing wall tie-down

Bridging piecerecommended undereach end of bracingunits where nominaltie-down specified

Bracing wall

Fastener - seetable below

Fastener design Uplift2/3.6Øx75mmnails NominalM12bolt&washer 13kN

3/2.8Øx50mmlong framingnails each side

90x35packermin200mm long

90x45MGP10bridging piece

90

Detail F10

meyJOIST / meyJOIST connection

top mount (IJt)joist hanger

25x0.8mmgalvanisedsteeltiestrapfixedtoeachmemberwithminimum3/30x2.8mmflatheadnails

Detail F11

Adjacent Outrigger

Minimum1.5xSc Sc

20

No gap

Outrigger

meyJOISt

Plywoodpackertop and bottom

50 typ.60

30

2rowsof12gType17Hexheadscrews or galvanised flat headnails at 150mm centres as shown

≤300deep7nailsor4screwseachend>300 deep 9 nails or 5 screws each end

meyJOISt flange width 45 63 90Packerthickness 18 27 392.8Ø nail length 50 65 N/a12gscrewlength 50 65 75*

all dimensions in mm* denotes 14g screw

Page 19

Allfixingsthroughwebandpackerintooutrigger.

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Detail F12

all dimensions in mm* denotes 14g screw

2060

30

50 typ.

meyJOISt

Outrigger

No gap

Timberblocks(tomatch meyJOIStflangethickness)

≤300deep7nailsor4screwseachend>300 deep 9 nails or 5 screws each end

double outrigger nailing to match as shown for single outrigger.

2rowsof12gType17Hexheadscrewsor galvanised flat head nails at 150mm centres as shown

Minimum1.5xSc Sc

Outrigger Single doubleOutriggerthickness 35 45 35 45Nail(min.2.8Ø)length 40 50 75 9012gscrewlength 45 50 75* 90*

Nested outrigger installation

meyJOIST cantilever for internal or weather proofed balcony application

meyJOIST short cantilever support

Detail F13

Detail F14

Lc≤ d

d

Loadbearing wall

Joistbackspannotless than 2 timesthe cantilever span

meyJOISt or solidblockingforallcantilevered joists

Usefulldepthblockingorcompressionblocksto transfer roof loadsto support

ForexternalusemeyJOISTfloorjoistsmust be protected from becoming wetby a fully waterproof coveringend trimmer

65mmminimum bearingCantile

ver span

Intermittentblocking

When specified installreinforcement as perdetail F21 or detail F22

Page 20

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Detail F17

Rimboard or boundary joist with meyJOIST

Detail F15 Detail F15a

Detail F16

meyJOIST long cantilever supportwith underbatten

meyJOIST long cantilever supportwith end trimmer

Cantilever sheet bracing end trimmer installation

Continuousblockingto cantilever joists

Loadbearing wall Load bearing wall

Continuousblocking

dd

Continuous trimmingjoist or sheet bracingframed closureattached to the endsof all joists - seedetail F16

When specified installreinforcement as perdetail F21 or detail F22

Sheet bracing secured towall plates or battens using2.5Øx30mmlongflatheadnails at 150mm centres

Allowablesheetbracing:-7mmF8Plywood- 4mm F22 plywood-4.8mmHardboard-6mmOS’Brace

When specified installreinforcement as perdetail F21 or detail F22

Flooring

Continuous wall plate or battenaboveandbelowandfixedtoeachmeyJOISTwith2/3.06Øx75mmlong framing nails

plywood or hardboard joined overtimber cleat and nailed withminimum 4 nails

Loadbearing wallWall bottom plate

Flooring

Splice between joists usingsame material 1 framing nail per flange.

Length to have 30mmmeyJOISt penetration

meyJOISt bearingto be as per

supporting floor only

Rimboard(17mm)orboundary joist

Face mount (IJF)joist hanger

35-45mmthickendtrimmer

Wall tie downto end trimmerby others

Underbatten

See Detail 15a foralternative option

See Detail 15 foralternative option

Lc > d

Lc > d

Page 21

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Detail F22

Detail F18

Detail F21

Cantilevers supporting loadbearing walls - Type 2 reinforcement

Cantilevers supporting loadbearing walls - Type 1 reinforcement

Installation of compression blocks

One or more compressionblocksofsimilarcombinedcross sectional area to that ofthe supported jamb stud or post

Loadbearing wallaligned under

15mm F11 structuralplywood cut to samedepth as joist

15mm F11 structuralplywood both sidescut to samedepth as joist

Nail plywood reinforcementtoflangesusing2.5Øx50mmlong flat head nails at 100mm centres

Nail plywood reinforcementtoflangesusing2.5Øx50mmlong flat head nails at 100mm centres

Type 1 - 15mm minimum dd F11 Structuralplywood nailed to one side of each joist- ply to full depth of joist- Face grain horizontal-Nailfixedasdetailed

Type 2 - 15mm minimum dd F11 Structuralplywood nailed to both sides of each joist- ply to full depth of joist- Face grain horizontal-Nailfixedasdetailed

*Plywood web stiffeners ofsuitable thickness availableas accessory product

*Plywood web stiffeners ofsuitable thickness availableas accessory product

All dimensions in mm* denotes 14g screw

All dimensions in mm* denotes 14g screw

Minimum1.5xSc

Minimum1.5xSc

Sc

Sc

100

100

Plywoodwebstiffeners*

Plywoodwebstiffeners*

Face grain direction

Face grain direction

plywood webstiffeners*

plywood webStiffeners*

12gType17Hexheadtimberscrewsorgalvanisedflatheadnailsthroughstiffener,webandintoouterstiffener(3 places, minimum 3 screws or 5 nails each)

12gType17Hexheadtimberscrewsorgalvanisedflatheadnailsthroughstiffenersbothsides(3 places, minimum 3 screws or 5 nails each)

Single nail to flangeas shown

Jamb stud or post

Compressionblockcut 1mm longerthan joist depth

meyJOISt flange width 45 63 90Webstiffenerthickness 18 27 39Nail(min.3.06Ø)length 75 90 9012gscrewlength 50 65 75*

meyJOISt flange width 45 63 90Webstiffenerthickness 18 27 39Nail(min.3.06Ø)length 75 90 9012gscrewlength 50 65 75*

Page 22

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Page 23 www.meyertimber.com.au

meyjoist For use As rAFtersmeyJOISTmayalsobecomepartofaveryeffectiveandeconomical roofsystem,particularlywhere lowpitchroofswithceilingdirectlyattachedtotheundersidearebeingdesigned.meyJOISTraftersallowtheflexibilityofhavingprovisionfortheinstallationofductingandelectricalservicesthroughtheweb,whilstofferingampleroomtoincludeinsulation.

meyJOISt may be used for pitched roofs up to 35 degrees if special attention is paid to connection and tie-down. It is importantthattheconnectionofraftersincludesfortheeffectsofwindloadingaswellasdead,liveandsnowloadswhereapplicable.

Rafter tie-downusing looped over straps is recommendedwhilst bracing requirements do not differwith the use of ameyJOISt roof system.

ManyoftheconstructiondetailsdonotdifferwhethermeyJOISTisusedasraftersorfloorjoists.Wherethefollowingrafterdetailsarespecifiedinsoftwareoutputstheassociatedfloordetailscanbeused:DetailR1 –Joisthangersforceilingjoists:SeeTable4.DetailR2 –Nailingdowntosupports:SeeDetailF5.DetailR3 –LateralRestraint–blockinginstallation:SeeDetailF1.DetailR4 –Carportpurlins–bracketinstallation:SeeTable4(Partialdepthhangersonly).DetailR5 –Restraintatsupportsbracedwithmetalstrap:SeeDetailF2.Tobeinstalledevery2ndrafter(minimum).DetailR6 –Restraintat supportsusingblocking: SeeDetail F1.Maximumblocking spacing1.8mor3 rafter spacings, whichever is greater.DetailR15 –Raftertie-down:Usingloopedsteelstrap:SeeDetailR13.DetailR24 –Rafteroverhang:Horizontalsoffitwithraftersbirdsmouthedatsupport:SeeDetailR9.DetailR25 –Webstiffening/packingforrafters:SeeDetailF6.

RAFTER SPAN TABLES

ThefollowingspantableshavebeenpreparedinaccordancewithAS1720.3:2016andarebasedonthefollowingdesigncriteria:

designIT®allowsforthedesignandspecificationofmeyJOISTraftersforotherapplicationsincluding:

• Raftersareforahouse.• The bottom flange is restrained by ceiling or ceiling battensatmaximum600mmcentres.• Thetopflangeisrestrainedbyroofbattensatmaximum 900mm centres.

• Roofmassdoesnotexceed40kg/m2, i.e. sheet roof and ceiling.• WindClassificationsuptoandincludingN3.• Permanent load serviceability design limit: span/300 or 20mm for main span and 10mm for overhang value.

• Roofmassfrom10kg/m2to90kg/m2.• Fullrangeofwindclassifications.• Rafters where continuous restraint is not provided to the bottom flange.• Overhangswithhorizontalsoffits.

• Facefixingtoridgebeamsanddetailsforbirdsmouthing over supports.• Alternatefixingdetails.• ContinuousSpans

Table 16: meyJOIST Single Span Residential Rafters (Sheet roof and ceiling)

Note:Span refers to the distance between the centerline of the supports, measured along the roof pitch. Span valuedesignedwithzerooverhang.Overhangvalueisdesignedinconjunctionwithmaximumspan.

Rafter spacing (mm)

600

Span (m) MJ200 45 5.1 1.1 4.5 1.1

MJ240 45 5.8 1.3 5.3 1.4

MJ240 63 6.4 1.4 5.9 1.5

MJ240 90 7.0 1.6 6.4 1.7

MJ300 45 6.8 1.6 6.2 1.7

MJ300 63 7.3 1.7 6.6 1.8 MJ300 90 7.9 2.0 7.2 2.0 MJ360 63 8.1 2.0 7.4 2.1 MJ360 90 8.7 2.3 8.0 2.4 MJ400 90 9.2 2.6 8.4 2.6

Span (m)OH (m) OH (m)

900meyJOIST

SectionCode

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Bevelled timberbearing plate -refer to detail R10

Birdsmouth cut tobear fully on top ofplate. Minimum bearing 45mm

3-4mm gap

Webstiffenerinstalled as perdetail F6

Bevel cut flange to bear fullyon top plate - minimumbearing 45mm

For rafters withoverhangs seeseparate detailsprovided

DO NOT CUTBEyOND FLANGE

FLANGE MUSTNOT OVERHANG

SUPPORT

Horizontalsoffitcut permitted ifrequired

For tie down refer tosoftware output forrequirements

3.06Øx75mmlongframing nail on each side

Minimum bearing length not less than45mm or as specified by software output

Install bevelled timber bearingplate - ensure tie downcontinues through to top plate

Install pryda mini-grip(or similar) both sidesandfixwithnailsasspecified

Roof Rafter Installation of mini-gripspitch Spacing (mm) (or similar)≤10o ≤1200 Not required >1200 Fixedwith2nailspertab10oto35o ≤1200 Fixedwith4nailspertab >1200 Fixedwith5nailspertab

Fix2/90x35 MGp12(one to eachside) tightagainst bottomflange. Clenchnail with tworowsof3.15Øx90mm long flathead nails at60mm centres

Bevelled timberbearing plate -refer to detail R10

Fix70x35MGP10(oneeachside) using two rows of3.06Øx75mmlongframingnails at 100mm centres

Fascia

Fascia

Maximumoverhangas specified

Overhang span

permitted bevel cut details

Suggested cuttingof bevelled plate

Notching at high end not allowed

Flange must notoverhang support

45mmminimumbearing

60

70

45

30

30

equal to overhangspan but not less

than 600mm

750mmmaximumoverhang

100

Rafter overhang:sloping soffit with bevelled plate support

Rafter overhang:sloping soffit with rafters birdsmouth at support

Rafter overhang:horizontal soffit with bevelled plate support

Detail R8Detail R7

Detail R9 Detail R11

Rafter bevel cut to supports

Detail R10

Fixing and support using bevelled plate

For roof pitches greater than 35o seek engineers advice.Nails as specified by mini-grip manufacturer.

Page 24

Page 25: BUILDING BETTER FLOORS · meyjoist - BuiLding Better FLoors meyJOISt is an engineered timber I-Joist supplied by Meyer timber® primarily used for floor and roof applications. available

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Detail R17

Intermediate lateral restraint for rafters:using battens and blocking

Detail R13 Detail R16

Detail R14

Rafter tie-down - using looped steel strapRafter support at ridge:

supported on a bevelled plate

Rafters support at ridge: face fixed to ridge beam

Bracketsrequired- see detail R10

Bevelled timberbearing plate -refer to detail R10

For tie down refer tosoftware output forrequirements

3.06Øx75mmlong framingnail on each side

30x0.8mmor25x1.0mmgalvanised mild steel straps looped over rafter and nailed to supports as specifed in the software output

30x0.8mmor25x1.0mmgalvanised mildsteelstraptieasshown.Fixat eachendwith7connectornails

30x0.8mmor25x1.0mmgalvanisedmildsteelstraptieasshown.Fixat eachendwith7connectornails

For 2nd Multigriplocate at top as shown

Locate Multigrip asshown

Ridge beam

InstallationofMultigrips:- Install with split toward middle of beam depth- For MJ200 and MJ240 use 1 Multigrip each side- For MJ300 and deeper use 2 Multigrips each side- Nail to each member as specified in the program output - distribute nails uniformly

Webpackinginstallas per detail F6

Variableslopebracketsmaybeused where available - refer to manufacturer’sspecifications

meyJOISTblocking

2/3.06Øx75mmlongframing nails per rafter

4/3.06Øx75mmlongframingnailsperblockingpiece (distribute evenly)top and bottom

Blocking3600mmmaximumspacing

Install intermediate battens andblockingatmid-span,thirdpointsor quarter points as specified bysoftware output

=

=

Roof batten

Roof battens

Fascia

70x35MGP10under batten

pryda Multigrips(or similar) on both

sides as specified below

Page 25

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Page 26 www.meyertimber.com.au

Detail R26

Nested rafter outrigger

Detail R18

Detail R23

Intermediate lateral restraint for rafters:using ‘hit and miss’ blocking

Blocking Detail

Lateral restraint for rafters:ceiling providing restraint to bottom flange

12gx50mmlongType17Hexheadscrew(TYP)

Blockingeverysecond rafter spacing

Fascia

Ceilingdirectlyfixedto underside

Ceilingfixedtotopof bottom flange

Ceilingbattens(max.600mmspacing)fixed

to underside

Packer

35mmTimberPacker

50

5060

15

30150

15

20

Fascia

3-4mmexpansion

gap

Webstiffener

Packing/stiffenerinstall as detail F6(see Section view)90x45MGP12

outrigger

Overhang

(maximum750

mm)

Minimum1.5

xoverha

ng

Minimum 5nails at each endUse flat head galvanised nails with sufficient

length to penetrate the receiving outrigger by at least 30mm

Outrigger installed in contact with top flange of meyJOISt

Note:Tiedownnotshownforclarity.Refer to software output requirements.

Section(at support)

9mm structuralplywood

SeeblockingDetail

2.5Øx40mmlongflathead nails at 100mm centres

Install‘hit&miss’blockingatmid-span,thirdpointsorquarter points as specified by software output

Roof batten

Roof batten

meyJOISt

Roof batten

meyJOISt

meyJOISt

Ceiling

Ceiling

CeilingCeiling batten

70x35MGP10

100maximum

100

=

=

Page 26

Rafter and TrussFastening System

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Fire And ACoustiCs – CLAss 2 And 3(MuLti-residentiAL) BuiLdingsTheNationalConstructionCode(NCC)isAustralia’sprimarysetoftechnicaldesignandconstructionprovisionsforbuildingsandisavailabletodownloadfreefrom:www.abcb.gov.au.Thereare10separateclassesofbuildingsintheNCCwhichrelatetotheirpurpose. meyJOISt is commonly used in Class 1 buildings (or houses) where the main consideration is structural suitability. Floor systems using meyJOISt, in combination with specific floor coverings and ceiling systems, can also be used in Class 2 or 3 buildings (multi-residential) where the systems must also meet minimum requirements for both fire and acoustics. It can also be used for all other classes of buildings such as retail, school, residential care or office buildings if it meets the fire-protected timber requirements of the BCa. these requirements are outlined in the Building Code of australia (BCa) Volume 1 which is part of the NCC.

FIRESection C in the BCa Volume 1 outlines the performance requirements for fire resistance and Specifications C1.1 outlines the deemed-to-Satisfy (dtS) Fire-Resisting construction requirements of building elements, including floors. this is typically described as a Fire Resistance Level (FRL) represented by the time in minutes for three fire test failure criteria - structural adequacy, integrity, andinsulation.Table17providesrequirementsforfloorsystemsinClass2or3buildings.

Notes:1. the use of fire-protected timber is mandatory for 4-storeys and above, in accordance with C1.13 of BCa (NCC 2019). the floor/ceiling system must also have a resistance to the incipient spread of fire (RISF) ≥ 45mins where 2 layers of 13mm thickfireprotectivegradeplasterboardwillcomply.2.ClauseC1.1Clause3.10(c)providesaconcessionforbuildingsfittedwithsprinklers.3. Fire-protective coverings can be 13mm fire-protective grade plasterboard or 12mm fibre cement. 4. Clause C1.5 allows 2-storey Class 2 and 3 buildings to be considered as type C construction if each sole-occupancy unit has its own direct access to a road or an open space.

ACOUSTICSas part of dtS Requirements of the BCa Volume 1, floors separating sole-occupancy units or a sole-occupancy unit from a plant room, lift shaft, stairway, public corridor/lobby etc must provide insulation against transmission of airborne and impact (structure-borne) generated sound sufficient to prevent illness or loss of amenity to the occupants. table 18 summarises the code requirements.

the acoustic performance of a floor system is dictated by the type of floor coverings in combination with the ceiling systems, withoutmuchrelianceonthetypeofjoistsystem.Carpetwithfoamunderlaysarewellknownfortheirabilitytominimizeimpactnoise. typically, ceiling systems would comprise of acoustic underlays, furring channels on resilient mounts and fire-rated ceiling.

THERMAL INSULATIONas part of the deemed-to-Satisfy provisions of the energy efficiency requirements of the BCa, internal floors must achieve a minimum R value of 2.0 for most areas in australia.

Figure 19 illustrates a typical example. For more information on using meyJOIST in apartments and multi-residentialconstruction, contact the Meyer timber® design office.

FIRE - BCA (NCC 2019) DTS Requirements for Floors

ACOUSTIC - BCA (NCC 2019) DTS Requirements for Floors

Deemed to Satisfy Provision(Laboratory performance)

Rw + Ctr

(airborne Sound)dnt,w + Ctr

(airborne Sound)Ln,w

(Impact Sound)Lnt,w

(Impact Sound)

Verification Method(In-situ performance)

Fire Resistance Levels (FRL) Class 2 and 3 BuildingsWith Sprinklers

Type ofConstruction

No. ofStoreys

4 or more a 90/90/90 ^1 N/a

30/30/30 or fire protective covering^3

30/30/30 or fire protective covering^3 30/30/30 or fire protective covering^3

30/30/30 or fire protective covering^3

3 a 60/60/60 ^2 90/90/90

2

2

B

C^4

Without Sprinklers

≥50 ≤62 ≤62≥45

Note: Below are examples for reference only. Tested system configurations need to be specified in the documentation and approved by the regulatory authorities.

Floor Covering:Bareflooring:Ln,w=60-62≤62Timberfloor+acousticunderlay:Ln,w=54-56≤62Carpet+acousticunderlay:Ln,w=40-50≤62

Rw+Ctr = 51-54 > 50 (for all floor covering types)

Flooring (minimum):19mmparticleboardor18mmOS’FloororequivalentCeiling lining:

FRL 90/90/90 - fire rated plasterboard (2/16mm)FRL 60/60/60 - fire rated plasterboard (1/16mm + 1/13mm)FRL 30/30/30 - fire rated plasterboard (1/13mm) Furring channel: on resilient mounts

meyJOIST: (minimum 240mm deep)

Insulation (cavity infill): R2.5 glasswool or equivalent

Figure 19: A Typical BCA DTS Compliant Floor System for Class 2 or 3 Buildings

Table 17: NCC2019 FRL Requirments for Floors

Table 18: NCC2019 Acoustic Requirements for floors

the required FRL is usually achieved in a system through use of fire rated linings such as plasterboard, fibre cement board or fire rated fabrics.

Page 28: BUILDING BETTER FLOORS · meyjoist - BuiLding Better FLoors meyJOISt is an engineered timber I-Joist supplied by Meyer timber® primarily used for floor and roof applications. available

Page 28

DISCLAIMER

The information contained in this document is current as May 2020 and is based on data available to Meyer Timber® at the time of going to print. Meyer Timber® reserves the right to change the information contained in this literature without prior notice. It is important that you call Meyer Timber® to confirm that you have the most up to date information available or refer to www.meyertimber.com.au.

Meyer Timber® has used all reasonable endeavours to ensure the accuracy and reliability of the information contained in this document. This information does not replace professional advice and we recommend that professional advice should be obtained specific to your circumstances. To the extent permitted by law, Meyer Timber® will not be liable for any inaccuracies, omissions or errors in this information nor for any actions taken in reliance on this information.

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plan your floor system estimating and delivery with this web based database specifically developed by Meyer timber®. It has never been easier with meypLaN:•the system is live - minimises admin delays to get your quote backfaster.

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