Marketing TecBeam Installation Guide

BEAM

Strong, lightweight composite structural ‘I’-Beam.

BEAM

Installation Guide

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ContentsThis Installation Guide has been prepared as a source of information to provide general guidance to consultants – and in no way replaces the services of the professional consultant and relevant engineers designing the project.

It is the responsibility of the architectural designer and engineering parties to ensure that the details in this Installation Guide are appropriate for the intended application.

The recommendations of this guide are formulated along the lines of good building practice, but are not intended to be an exhaustive statement of all relevant data.

Introduction 3

1.1 General Notes 3

1.2 Web Hole Alignment 3

1.3 Strongbacks (SB) 4

1.4 Blocking & Bracing 8

1.5 Load Spreaders 9

1.6 Bearing Support 10

1.7 Web Stiffeners 11

1.8 Internal Walls 13

1.9 Trimming, Notching or Docking 13

1.10 Connection and Fixing Details 14

IntroductionTECBEAM™ is a composite structural ‘I’-Beam which has a continuous galvanized steel web and timber flanges resulting in a lightweight beam with structural properties closely resembling those of a steel beam rather than a solid beam. TECBEAM™ is designed and manufactured in Australia by licensed fabricators and holds worldwide patents for its technology.

1.1 General NotesConventional framing practices can also apply to TECBEAM™ installations: however, to gain maximum benefit from using the TECBEAM™ system, builders are strongly advised to take advantage of its unique features by adopting the following guidelines.

To meet the requirements of the Building Code of Australia (BCA), all works must comply with AS 1684.2-1999 and where applicable with TECBEAM™ Installation Guidelines.

For details not covered in this manual, please refer to either: TECBEAM Australasia P/L, local TECBEAM™ fabricator or a registered structural engineer.

1.2 Web Hole Alignment For installation of strongbacks (SB) and services

To achieve alignment of web holes, for the installation of strongbacks and services, TECBEAM™ joists have been colour marked at one end, called the COMMON END. Refer to the Floor Framing Plan for set out reference lines (RL)

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Strongback Strongback

Common end

Common end

1.3 Strongbacks (SB)Strongbacks have been proven to:

• significantlyreducefloorvibration

• loadshareaconcentratedload

• bemoreeffectivethansolidblocking

• actasinternalsupportbeams

1.3.1 General• Beforesecuringwedges,ensurestrongbacksarebelow15%MoistureContenttoavoidsqueakyfloors

• MinimumMGP10grade

• Ifhighercomfortlevelsfromfloorvibrationarerequired,useMGP12,F17,LVLorincreasethenumberofstrongbacks

Recommended Sizes

• T25series–140x45

• T30series–190x45or200x45LVL

• T35series–190x45or200x45LVL

• Forhigherloading,steelsectionscanbeusedasstrongbackorinternalbeams;refertoTECBEAMAustralasiaorastructuralengineer

Restrictions

• Formaximumefficiency,avoidcuttingholeswithadiametergreaterthanonethirdthedepthofthestrongback

• Forlongjoistspans,planthelocationofservicesandpositionofstrongbackstoavoidcuttingasmuchaspossible.Thisistokeepfloorvibrationundercontrol

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Strongback

Pair of wedges

1.3.2 Installation• Strongbacksmustbesecuredtightwithapairofwedgesateachjoist;itisrecommendedwedgesaregluedand

nailed. See 1.3.4 Wedges

• Whereapointloadoccurs,locateastrongbackthroughthewebholeclosesttothepointloadandlongenoughtofix through at least two joists each side of the joist carrying the load

• Installstrongbackswithaminimumlapofone(1)bay

• Lapsinstrongbacksmaybeinstalledin

a) the same hole or b) the next adjacent hole

• Min.strongbackslengths:2100mmfor450crsand2400mmfor600crs

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a) Strongbacks overlap in same hole (3 & 4) or

b) Strongbacks overlap in next adjacent holes (1 & 2)

Strongback

Support

POINTLOAD(>500kg)

Web Stiffener

Strongback

Min. overlap = 1 bay

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1.3.3 SpecificationsMinimum recommendations for vibration control

• Installonerowofstrongbacksmidspanwherethejoistsarewithin0.75mto1.5mofthetabulatedspan.

• Wherethejoistspanisover6morwithin0.75mofthetabulatedspan,installtworowsofstrongbacks;placedapproximately at one third points of the joist span.

• Forcontinuousspans–addaStrongbackintheshorterspanevenifitislessthanthespansindicatedabove.

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Within0.75–1.5mofmaxtabulatedspan

Strongback

Mid

span

Within0.75mofmaxtabulatedspanorspanover6m

Strongback

Strongback

1/3

of sp

an1/

3 of

span

1/3

of sp

an

SPAN

SPAN

1.3.4 Wedges• Wedgesareusedtosecurethestrongbacktoeachjoist.Looseorpoorlyfittedwedgesmayresultinthefloor

squeaking

• Itisrecommendedthatwedgesareinstalledinpairs,hammeredhardagainsttheopposingwedgethenglued&nailed

• MustbedrywithaMoistureContent<15%beforefixing

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Timber wedges glued and nailed or screw fixed, centred about the web

(Alternative: wedges can be fixed on top of web)

1.4 Blocking & Bracing (in the floor plane)

• TECBEAM™joistsdonotrequireintermediateblockingwherethereiseitherfullfloorsheetingandceilinglining,orstrongbacks (Note: Strongbacks are more effective than solid blocking)

• Installblockinginthefollowinglocations:

a) at cantilevers along the support line and in alternate bays at the outer end if no trimmer is indicated, b) alongallsupportlines–maximumspacing1.8m,c) incontinuousspans–alongintermediatesupports,d) under partition walls running parallel to the joists.

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Blocking in alternate bays

1.5 LoadSpreaders (or rimboards)

• Wherejoistsareoffsetfromloadbearingstuds,PlywoodLoadSpreaders(orrimboards)canbeusedinsteadofextrastuds, wall plate blocking or a double top plate

• Loadspreadersshouldbeminimum12mmF11constructionplywood,cuttotheexactjoistdepthandfittedtightbetweenthewallplateandflooring

• Installjoistswitha15mmsetbackfromtheoutsidefaceofthewallframe.Fixeachoffsetjoistwithaminimum8/40x2.8mmnails

• LoadSpreadersshouldspanatleastthreestudsorminimum1350mm

• Offsetjoistscarryingloadsinadditiontonormalresidentialfloorloads,mayrequireextrafixings–refertostructuralengineer

• PlywoodLoadSpreadersalsoprovidein-floor-planebracing,eliminatingendblocking,orcrossstrapping

• Whenusedasendbracingonly,the15mmsetbackisnotrequired;fixwithaminimumoffournailsperjoist

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Rim Board nailed at ends of TECBEAM™ joists

1.6 Bearing Support• Recommendedminimumbearinglength:45mm

Alternately,TECBEAM™joistscanbestaggeredatinternalloadbearingwallsforfull90mmbearing

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Blocking as specified

45mmbearing

90mmLBW

45mm

90mm

Blocking as specified

90mmbearing

90mmLBW

1.7 WebStiffeners (or web blocks)

• arerequiredtotransfershearloadsintooroutofthesteelweb

• areusedtobracethewebinhighloadcases

1.7.1 Minimum Requirements:• MinimumSize:70x35seasonedtimber,tightfittingbetweentimberflangesoneachsideofthewebandnailed

together

• Minimumnailing: T25–8/65x2.7mm

T30–8/65x2.7mm

Web stiffeners are required at:

a) the ends of all joists

b) the support line for cantilevers

c) at the supporting walls, beams, posts, in continuous spans

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Flooring

Strongback

b) Support line for cantilevers

Blocking every third bayWeb Stiffener each side of TECBEAM™ joists

a) End of joist

Timber packer

Intermediate support

Blocking at alternate bays

Web Stiffener each side of TECBEAM™ joists

d) underpointloadsexceeding500kg

e) perimeter walls

• Underperimeterloadbearingwalls,asingleTECBEAM™joistfittedwithextrawebstiffenersreplacestwosolidtimberjoists

• Recommendedwebstiffenerspacing:

MetalRoofs: 1350mmcrsTileRoofs: 900mmcrsupto10mspanHeavierLoads:600mmcrs

Note: If a web hole occurs over the support, add a pair of web stiffeners as close to the support as possible but covering the steel web sufficiently to fix the minimum nailing required through the web.

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Web Stiffener

Web Stiffener

Strongback

Support

Web Stiffener

POINTLOAD(>500kg)

1.8 Internal Walls (non load-bearing)

CrossingFloorJoists–Forasinglewallwithinthemiddlehalfofthejoistspanandalsowithin300mmofthetabulated span, one of the following measures is required:

• addanextrajoistevery1800mmcrsor

• reducejoistspacing,e.g.600mmto450mmcrs,450mmto350mmcrs,or

• upgradetonextjoistsize

Note: for additional walls crossing the joists, check with TECBEAM Australasia or a structural engineer

ParalleltoFloorJoists–Whereawallcoversover65%ofthejoistspan,checkthefollowing:

• Joists@600crs–ifthespaniswithin500mmofthetabulatedspan,addanextrajoistunderthewall

• Joists@450crs–ifthespaniswithin900mmofthetabulatedspan,addanextrajoistunderthewall

Notes:

1.Installastrongbackatmidspan2100mmlongtoevenoutdeflections

2.Supportwallslocatedbetweenjoistswitheithershortstrongbacksorsolidblocking@1800mmcrs

1.9 Trimming, Notching or Docking• Trimming,notchingordockingispermissableonlyatendsupports

• The“CommonEnd”hasapairofeither140mmor190mmwidewebstiffenersfittedwiththesteelwebsetback70mmor90mmrespectively.Thisfeatureallowsforthetimbertrimming,notching,ordocking

1.9.1 Restrictions on Notching:Bottom Flanges

TECBEAM™joistbottomflangescanbenotchedupto15mmandnolongerthan100mm.Ifgreaternotchingisrequired, refer to TECBEAM Australasia, or a structural engineer.

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Trip-L-grip or skew nailing

Web blocking in alternate bays

100mmMax.

15mmMax.

Top Flanges

Canbenotchedtothefulldepthoftheflangeandhalfthewidthofthestiffener.

1.10 ConnectionandFixingDetails• Generally,standardtimberframingconnectorsandframingmethodsaresuitablewithTECBEAM™joists

• Forhigherloadcapacityapplications,heavydutyconnectorsmaybenecessary(refertoastructuralengineer)

1.10.1 Connection to Timber Beams• Undernormalfloorloads,StandardJoisthangersareusedtoconnectTECBEAM™joiststotimberbeams

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Timber beam

Standard joist hanger


70/95mm

140/190mm

• WhereTECBEAM™joistscarryhigherloadse.g.doublejoistatstairvoid,acombinationofajoisthangerononejoist and a steel angle bracket fixed with 2M12 bolts on the other joist can be used. Refer to TECBEAM™ Standard Details

1.10.2 Connection to Steel Beams

A. Notching – install against the beam web and bearing on the flangeA1. Steel beams with a height similar to TECBEAM™ joists

• Notchthejoistinsidethesteelbeam(refernotchinglimitations)withthejoistsbearingonthebottomflangeofthesteel beam

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2M12galvanisedboltsat60mmcentres or M12 all thread

Double TECBEAM™ floor joists carrying high loads e.g. stair landing

Joist Hanger

Waler plate bolted to wall

Not visible in this view:100x75x6MSangles: 300mmlong(T30) 240mmlong(T25)2-D16 (M12 thread) dynabolt anchors per angle 60mmembedmentat: 180mmcrs(T30) 130mmcrs(T25)


Bolt, Tek screw, or power fasten to web

Block alternate bays

Joist Hanger

A2. Larger Steel beams – TECBEAM™ joists shallower in depth than steel beams (no notching)

• Installsolidtimberblockinginalternatebays

• Fixblockingsecurelytothewebofthesteelbeambybolting,TekscrewsorRamsetpowerfasteners

A3. Larger Steel beams – Shallower TECBEAM™ joists with timber bearing plate

• Installsolidtimberblockinginalternatebays

• Fixblockingsecurelytothewebofthesteelbeambybolting,TekscrewsorRamsetpowerfasteners

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Bearingplate–boltorpowerfastentoweb

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B. Beam Cleats – use where it is not practical to bear on the flange• Weldsteelcleats,orfixanglestothebeamwebandinstallboltsthroughthejoistwebstiffenerasshown

• Boltsindicatedarefornormalfloorloadsonly

Joist Bolts Minimum

a b c

T25 2M10 70 50 25

T30,T35 2M12 85 80 30

6mm Welded web cleat

Welded web cleat

a

b

c

C. Continuous solid timber packing• Packthesteelbeamwithcontinuoussolidtimber

• Boltpackingtosteelbeamwebasperengineer’sspecificationsandfixTECBEAM™withjoisthangerorTrip-L-Grip

• Ensurethesteelbeamisbracedagainstrotationcausedbytheoffsetloading

‘I’ Beam

or (PFC):

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Beam braced against rotation

Trip-L-Grip or joist hanger

Boltstoengineer’sdesign

Continuous timber packing

PFC

Trip-L-Grip or joist hanger

Boltstoengineer’sdesign

Continuous timber packing

25mmMax.overhang

Design notes:

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BEAM

48–50HallamSouthRoad HallamVIC3803

Tel 1800333162 Fax 0397963449

email [email protected]

Design by TheSHAPEGroup

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Marketing TecBeam Installation Guide