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Timber joist Timber joists ceilings and separating ... 6.5 - Timber joist.pdf · 308 Timber joists ceilings and separating / compartment floors 6.5 Direct fix plasterboard ceiling

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    Timber joist

    Ceilings to timber joist floors are an established form of

    ceiling construction, which is widely used in both new

    housing and refurbishment. Separating / compartment

    floors are often specified as fire and sound resisting floors

    in residential units such as flats and apartments to meet the

    requirements of national Building Regulations.

    The ceilings comprise one or two layers of Gyproc

    plasterboard screw-fixed or nailed to traditional timber joist

    supports. Isover glass mineral wool insulation can be

    included in the floor cavity to improve acoustic performance.

    Timber joist ceiling linings are quick and easy to install, and

    provide a lining which can be jointed to give a seamless

    finish ready for direct decoration or a traditional gypsum

    plaster finish.

    Traditional and established method

    Versatile

    Use of Gyproc Drywall Timber Screws

    minimises fixing defects

    Gypframe RB1 Resilient Bar to provide

    enhanced acoustic performance and

    eliminate nail-popping

    Can achieve high performance levels

    Quick and easy to install

    Key facts

    Gyproc plasterboard - direct fix with Gyproc Drywall Timber Screw

    Gypframe RB1 Resilient Bar - indirect fix

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    Health and SafetySafety Data Sheets for all Gypsum Industries products areavailable to download from our website: www.gypsum.ie,or via the Technical Sales Department.

    Gyproc board products

    Gyproc WallBoard 1, 2

    Thickness 12.5, 15mm

    Width 900, 1200mm

    Gyproc FireLine 1

    Thickness 12.5, 15mm

    Width 1200mm

    Gyproc SoundBloc 1

    Thickness 12.5, 15mm

    Width 1200mm

    Gyproc Plank

    Thickness 19mm

    Width 600mm

    Gyproc 4x2s

    Thickness 9.5, 12.5mm

    Width 600mm

    Glasroc F MultiBoard

    Thickness 6, 10, 12.5mm

    Width 1200mm

    Glasroc F FireCase

    Thickness 15mm

    Width 1200mm

    1 Moisture resistant boards are specifed in intermittent wet useareas e.g. shower areas, bathrooms and kitchens.2 Also available in DUPLEX grades where vapour control is required.pour check is required.

    Gypframe metal products

    Gypframe RB1 Resilient Bar

    Prime dimension 16mm

    Fixing and finishing products

    Gyproc Drywall Timber Screws or Glasroc

    FireCase Screws

    For a positive direct fix of boards to

    timber joists.

    Gyproc Drywall Screws

    For fixing ceiling lining boards to Gypframe

    SureFix Bars or Resilient Bars.

    Gyproc Sealant

    Sealing air paths for optimum sound

    insulation.

    Gyproc jointing materials

    For seamless jointing.

    Gyproc Skimcoat, Gyproc Carlite Finish or

    Gyproc Board Finish

    To provide a plaster skim finish.

    Isover Acoustic Roll

    For enhanced acoustic performance.

    Isover Modular Roll

    For providing acoustic / thermal insulation.

    Isover Sound Deadening Floor Slab

    Stone mineral wool

    For providing enhanced fire performance in

    some applications.

    COMPONENTS

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    Direct fix plasterboard ceilingBoards are fixed to ceilings, prior to lining walls and

    partitions, with the long edges at right angles to the joists.

    Cut-ends are located over a joist or timber nogging

    support. Timber noggings (where required) are fitted

    between joists at room perimeters to support board edges.

    Noggings may also be required to support board edges in

    the field of the boards. Boards are preferably fixed to

    timber supports using Gyproc Drywall Timber Screws, to

    minimise fixing defects.

    Indirect fix to Gypframe RB1 Resilient BarsThe bars are fixed through the single fixing flange to the

    underside of timber joists (at 90 to them) using Gyproc

    Drywall Screws. The first and last rows of Gypframe RB1

    Resilient Bars are located at all wall perimeters. Boards are

    fixed to the underside of Gypframe Resilient Bars with long

    board edges at right angles to the bars. When fixing

    boards, care must be taken to ensure that the plasterboard

    fixing screws do not make contact with the joists.

    INSTALLATION

    For full installation details, refer to the Installation Guide at www.gypsum.ie

    Direct fix plasterboard ceilingBoards are fixed to ceilings, prior to lining walls and

    partitions, with the long edges at right angles to the joists.

    Cut-ends are located over a joist or timber nogging

    support. Timber noggings (where required) are fitted

    between joists at room perimeters to support board edges.

    Noggings may also be required to support board edges in

    the field of the boards. Boards are preferably fixed to

    timber supports using Gyproc Drywall Timber Screws, to

    minimise fixing defects.

    Indirect fix to Gypframe RB1 Resilient BarsThe bars are fixed through the single fixing flange to the

    underside of timber joists (at 90 to them) using Gyproc

    Drywall Screws. The first and last rows of Gypframe RB1

    Resilient Bars are located at all wall perimeters. Boards are

    fixed to the underside of Gypframe Resilient Bars with long

    board edges at right angles to the bars. When fixing

    boards, care must be taken to ensure that the plasterboard

    fixing screws do not make contact with the joists.

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    PERFORMANCE

    Please refer to section Introduction - for general considerations.6.1

    Table 2 - Dimensions and performance1 - Gyproc plasterboard linings

    1 32

    Timber joists with suitable timber room perimeter noggings. Noggings also required to support

    board edges, unless otherwise stated.

    Gypframe RB1 ResilientBars at 450mm centres to

    underside of joists.100mm Isover Modular

    Roll in the cavity.

    Detail Board type Flooring Joist Joist Fire Estimated laboratory Performanceboard centres width resistance6 sound insulation3 substantiationtype2 (min.) 100 - 3150Hz report

    Airborne Impactmm mm mins Rw dB Lnw dB

    One layer of 12.5mm Gyproc WallBoard d 450 38 305 36 81 C014003

    One layer of 12.5mm Gyproc WallBoard a 600 38 30 (modified)4 38 79 C016001

    One layer of 12.5mm Gyproc WallBoard d 600 38 30 38 79 C016002

    One layer of 15mm Gyproc WallBoard c 600 38 305 40 - C106029

    Two layers of 15mm Gyproc WallBoard d 600 47 60 40 76 C016006

    Inner layer of 12.5mm Gyproc WallBoard c 600 38 60 40 76 C016008and an outer layer of 15mm Gyproc FireLine

    Two layers of 12.5mm Gyproc FireLine d 600 38 60 40 76 C016009

    Inner layer of Gyproc Plank and an outer b 600 50 60 40 75 C016007layer of 12.5mm Gyproc WallBoard

    Inner layer of Gyproc Plank and an outer d 600 45 60 50 68 C206003layer of 12.5mm Gyproc WallBoard

    Inner layer of Gyproc Plank and an outer d 600 45 60 54 67 C016030layer of 12.5mm Gyproc SoundBloc

    Two layers of 15mm Gyproc FireLine d 450 47 90 40 78 C014011

    1 The fire resistance and sound insulation performances are for ceilings incorporating tapered edge boards with all joints taped and filledaccording to Gypsum Industries recommendations. The quoted performances are achieved only if Gypsum Industries components areused throughout, and the Companys fixing recommendations are strictly observed. Any variations in the specification should be checkedwith Gypsum Industries. Where boards are fixed direct to timber joists, screw-fixing is the preferred alternative to nail-fixing andminimises the risk of fixing defects occuring.2 Floor types: a Any structurally suitable wood board flooring.

    b Wood board t & g flooring, not less than 15mm (finished) thickness.c Wood board t & g flooring, not less than 18mm (finished) thickness.d Wood board t & g flooring, not less than 21mm (finished) thickness.

    3 The acoustic ratings quoted above are based on 200mm deep joists and a walking surface of min. 9.6kg/m3.4 30 : 15 : 15. If the floor type d is used the fire resistance increases to a full 30 minutes.5 Noggings to support board edges not required.6 Board joints must be reinforced with Gyproc Paper Joint Tape for the quoted fire resistance periods to be achieved. Please refer tosection for full details.

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    1 32

    Table 3 - Dimensions and performance1 - non-combustible board linings

    4 65

    Detail Board type Flooring Joist Joist Insulation Fire Performanceboard centres width resistance5 substantiationtype2 (min.) report

    mm mm mins

    One layer of 6mm MultiBoard b 450 38 - 30 G104019

    One layer of 12.5mm MultiBoard a 600 38 - 30 G106021

    1 The fire resistance performances are for imperforate ceilings with all joints taped and filled in accordance with Gypsum Industriesrecommendations. The quoted performances are achieved only if Gypsum Industries components are used throughout, and the Companysfixing recommendations are strictly observed. Any variations in the specifications should be checked with Gypsum Industries. Where boardsare fixed direct to timber joists, screw-fixing is the preferred alternative to nail-fixing and minimising the risks of fixing defects occurring.2 Floor types: a 21mm plain edge wood board flooring.

    b Wood board t & g flooring, not less than 18mm (finished) thickness.c Wood board t & g flooring, not less than 19mm (finished) thickness.d Wood board t & g flooring, not less than 20mm (finished) thickness, or 20mm plain edge boarding with 3mm

    hardboard or plywood.3 Use 58mm FireCase Screws at 150mm centres. 38mm x 38mm timber noggings are also required between joists and at the perimeter tosupport board edges.4 Noggings to support board edges not required.5 Board joints must be reinforced with Gyproc Paper Joint Tape for the quoted fire resistance periods to be achieved. Please refer tosection for full details.

    Two layers of 10mm MultiBoard a 600 47 - 60 G106022

    Two layers of 10mm MultiBoard a 600 47 100mm Isover 60 G106023Modular Roll

    80mm x 10mm MultiBoard strips b 4004 50 30mm stone mineral 60 G104024(screw-fixed), with one layer of 10mm wool (64kg/m3)Glasroc MultiBoard (screw-fixed)

    80mm x 10mm MultiBoard strips c 600 50 60mm stone mineral 60 G106046(screw-fixed), with one layer of 10mm wool (23kg/m3)MultiBoard (screw-fixed)

    One layer of 15mm FireCase S b 600 38 - 60 G106025(screw-fixed)3

    100mm x 10mm MultiBoard strips d 6004 38 25mm stone mineral 60 G106026(screw-fixed), with one layer of 12.5mm wool (48kg/m3)MultiBoard (screw-fixed)

    One layer of 12.5mm MultiBoard, d 6004 38 - 90 G106027100 x 10mm MultiBoard strips andan outer layer of 12.5mm MultiBoard

    One layer of 12.5mm MultiBoard, d 6004 38 100mm Isover 90 G106028100 x 10mm MultiBoard strips and Modular Rollan outer layer of 12.5mm MultiBoard

    Timber joists with suitable timber room perimeter noggings.Noggings also required to support board edges, unless stated otherwise.

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    19mm Gyproc Bonding or with 2mm c 600 48 120 C016045Gyproc Skimcoat or Carlite Finish

    Table 4 - Dimensions and performance1 - upgrading existing lath and plaster ceilings

    1 32 4

    Existing lath and plasterceiling supported bychicken wire securelynailed to the joists,

    battened with 38mm x38mm timber (at 600mmcentres with noggings or450mm centres without

    noggings).

    Existing ceilingunderdrawn with

    metal lath2 securelyfixed to the joists.

    Existing lath and plasterceiling (up to 20mmthick) supported by

    chicken wire securelynailed to the joists.

    Existing ceilingremoved and metal

    lath2 securely fixed tothe joists.

    Detail Board type Flooring Joist Joist Fire Performanceboard centres width resistance7 substantiationtype3 (min.) report

    mm mm mins

    One layer of 12.5mm Gyproc WallBoard d 600 38 30 C016019

    1 The fire resistance performances are for imperforate ceilings incorporating boards with all joints taped and filled according to GypsumIndustries recommendations. The quoted performances are achieved only if Gypsum Industries components are used throughout, and theCompanys fixing recommendations are strictly observed. Any variations in the specifications should be checked with Gypsum Industries.Where boards are fixed direct to timber joists, screw-fixing is the preferred alternative to nail-fixing and minimises the risk of fixingdefects occurring.2 Where plaster is applied to ribbed metal lath, the plaster thickness is measured from the face of the lath, and the lath should be installedin accordance with the manufacturers recommendations. With 120 minutes fire resistance construction, the metal lath is independentlyfixed with wire supports from the joist sides.3 Floor types: a Wood board t & g flooring, not less than 20mm (finished) thickness, or 20mm plain edge boarding with 3mm

    hardboard or plywood.b Wood board t & g flooring, not less than 21mm (finished) thickness, or 20mm plain edge boarding with 3mm

    hardboard or plywood.c Wood board t & g flooring, not less than 22mm (finished) thickness, or 20mm plain edge boarding with 3mm

    hardboard or plywood.d Any structurally suitable wood board flooring.

    4 Assumes no contribution from the existing lath and plaster ceiling.5 Bridging comprises of a layer of 12.5mm Gyproc MultiBoard resting on 100mm x 12.5mm Gyproc MultiBoard strips which are screw-fixedto the sides of each joist flush with the bottom edge, strips fixed at 300mm centres, top and bottom.6 Fix MultiBoard strips at 300mm centres, top and bottom.7 Board joints must be reinforced with Gyproc Paper Joint Tape for the quoted fire resistance periods to be achieved. Please refer tosection for full details.

    Two layers of 12.5mm Gyproc FireLine b 600 38 60 C016022

    13mm Gyproc Bonding or with 2mm b 600 37 60 C016024Gyproc Skimcoat or Carlite Finish

    Two layers of 10mm MultiBoard b 600 37 60 G106045

    100mm x 10mm MultiBoard a 600 50 60 G106029with one layer of 12.5mm MultiBoard

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    2.2

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    Two layers of 15mm Gyproc FireLine b 450 45 90 60 57 C204002

    4 5

    Platform floor. 100mm Isover Modular

    Roll between the joists. Floor type c3

    Platform floor.

    CasoLine MF4 hung underneath timber

    joists to give a 277mm cavity, with

    80mm Isover Modular Roll

    between the joists. Floor type c3

    GypFloor SILENT with Gyproc Plank

    on Gypframe SIF Floor Channels.

    100mm Isover Modular Roll in the

    cavity. Gypframe RB1 Resilient bars

    at 450mm centres.

    Table 5 - Dimensions and performance1 - compartment / separating2 floors

    1 32

    Separating sub-joist floor

    comprising of a platform floor.

    100mm Isover Modular Roll in the cavity.

    Floor type c3

    GypFloor SILENT with Gyproc Plank on

    Gypframe SIF Floor Channels.

    100mm Isover Modular Roll in the

    cavity. GypLyner framework to joists.

    Detail Board type Flooring Joist Joist Fire Estimated laboratory Performanceboard centres width resistance5 sound insulation substantiationtype2 (min.) 100 - 3150Hz report

    Airborne Impactmm mm mins Rw dB Lnw dB

    One layer of Gyproc Plank with an outer c 600 44 60 62 56 C016038layer of 12.5mm Gyproc SoundBloc

    Two layers of 15mm Gyproc SoundBloc c 600 44 60 66 50 C106011

    Two layers of 15mm Gyproc SoundBloc b 450 45 60 61 56 C204006

    One layer of Gyproc Plank and one layer b 450 45 60 63 55 C204001of 12.5mm Gyproc SoundBloc

    One layer of Gyproc Plank and one layer b 450 45 60 63 55 C154008of 12.5mm Gyproc SoundBloc

    Two layers of 15mm Gyproc SoundBloc c 600 47 60 664 48 C106050

    1 The fire resistance and sound insulation performances are for ceilings incorporating tapered edge boards with all joints taped and filledaccording to Gypsum Industries recommendations. The quoted performances are achieved only if Gypsum Industries components areused throughout, and the Companys fixing recommendations are strictly observed. Any variations in the specification should be checkedwith Gypsum Industries. Where boards are fixed direct to timber joists, screw-fixing is the preferred alternative to nail-fixing andminimises the risk of fixing defects occuring.2 If in doubt as to whether a floor is to be a compartment or separating floor, or both, please refer to the relevant Technical Guidance Document.3 Floor types: a Any structurally suitable wood board flooring.

    b Softwood floor boarding, not less than 21mm (finished) thickness.c Walking surface of 18mm t & g wood board flooring, spot-bonded with Gyproc Sealant at 300mm centres to

    a substrate of Gyproc Plank laid on 25mm Isover Sound Deadening Floor Slabs (64kg/m3) laid on a minimumof 12mm wood based sheet sub-deck nailed to the joists.

    4 Normal fixing centres for Gypframe MF5 Ceiling sections (450mm) and Gypframe MF7 Primary Support Channels (1200mm).5 Board joints must be reinforced with Gyproc Paper Joint Tape for the quoted fire resistance periods to be achieved. Please refer tosection for full details.

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    6.5

    Two layers of 10mm Gyproc MultiBoard 600 354 150mm Isover 60 G106042Modular Roll

    Two layers of 12.5mm Gyproc FireLine 600 38 150mm stone mineral 60 C106048Wool (24kg/m3)

    Two layers of 15mm Gyproc FireLine 600 354 30mm stone mineral 60 C106051Wool (45kg/m3)

    Table 6 - Dimensions and performance1 - upgrading sound insulation of a basic floor

    1 32

    195mm x 45mm timber joists at

    600mm centres with 18mm t&g

    wood chipboard flooring.

    CasoLine MF hung underneath the basic

    floor (ceiling removed) to give a

    277mm cavity. 80mm Isover Modular

    Roll in the cavity.

    CasoLine MF hung from the basic floor

    using Gypframe Acoustic Hangers to

    give a 277mm cavity. 80mm

    Isover Modular Roll in the cavity.

    UpgradingExisting basic floor

    Detail Board type Approximate Floor Laboratory sound insulation Performanceweight depth 100 - 3150Hz substantiation

    Airborne Impact reportkg/m2 mm Rw dB Lnw dB

    Existing layer of 12.5mm Gyproc plasterboard 10 226 38 79 C106028

    Two layers of 12.5mm Gyproc SoundBloc 23 320 60 60 C106007

    Two layers of 12.5mm Gyproc SoundBloc 23 320 63 54 C106013

    1 The sound insulation performances are for imperforate ceilings with all joints taped and filled according to Gypsum Industriesrecommendations. The quoted performances are achieved only if Gypsum Industries components are used throughout, and theCompanys fixing recommendations are strictly observed. Any variations in the specifications should be checked with Gypsum Industries.

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    3

    Table 7 - Dimensions and performance2 ceilings below roof spaces

    1 32 4

    Detail Board type Max. joist/ Min. joist / Insulation Fire Performancetruss centres truss type resistance5 substantiation

    width reportmm mm mins

    One layer of 12.5mm MultiBoard 600 38 150mm Isover 30 G106041Modular Roll

    Two layers of 12.5mm Gyproc WallBoard 600 38 150mm Isover 30 C106049Modular Roll

    One layer of 12.5mm Gyproc FireLine 600 38 150mm Isover 30 C106047Modular Roll

    Two layers of 12.5mm Gyproc WallBoard 600 354 100mm Isover 30 C106045Modular Roll

    2 The fire resistance performances are for imperforate ceilings incorporating boards with all joints taped and filled according to BritishGypsums recommendations. The quoted performances are achieved only if Gypsum Industries components are used throughout, and theCompanys fixing recommendations are strictly adhered to. Any variations in the specifications should be checked with British Gypsum. Whereboards are fixed direct to timber joists, screw-fixing is the preferred alternative to nail-fixing and minimises the risk of fixing defects occuring.3 For fire-rated ceilings below roof spaces, noggings are required regardless of joist spacings and plasterboard thickness.4 Nominal 50mm x 25mm timber battens should be fixed to the side of timber supports where the ceiling boards butt in order to maintain anadequate bearing surface.5 Board joints must be reinforced with Gyproc Paper Joint Tape for the quoted fire resistance periods to be achieved. Please refer tosection for full details.

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    Timber joists or bottom chord of trusses with timber noggings between joists to support board edges and at room perimeter.3

    Insulation laid between joists.CasoLine MF hung from joists.

    Insulation laid over ceiling grid.

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    EnvironmentalGyproc plasterboard ceilings are unsuitable for use in areas

    subject to continuously damp or humid conditions.

    Plasterboards are not suitable for use in temperatures

    above 49C but can be subjected to freezing conditions

    without risk of damage.

    Fire protection For reaction to fire classifications for Gyproc and Glasrocboards please refer to Section .

    Fire resistanceThe fire resistances given in Tables 2, 3, 4, 5, 6 and 8 are for

    imperforate ceilings tested to BS 476: Part 8: 1972 or

    BS 476: Part 21: 1987, or BS 476: Part 22: 1987, or

    assessments based on these tests.

    Sound insulationThe airborne and impact sound ratings given in Tables

    2, 6 and 7 are for imperforate ceilings and have been

    tested in accordance with BS EN ISO 140-3: 1995 and

    BS EN ISO 140-6: 1998, and rated in accordance with

    BS EN ISO 717-1: 1997 and BS EN ISO 717-2: 1997.

    Airtightness is essential for optimum sound insulation.

    While most junctions will be sealed with standard jointing

    materials, gaps at the perimeter of the floor and ceiling,

    and other small airpaths, can be sealed using Gyproc

    Sealant.

    The sound insulation data quoted was measured in the

    absence of flanking transmission. The performance of the

    floor in practice will generally be governed by flanking

    transmission.

    Water vapour controlWhere there is a requirement for a vapour control layer,

    DUPLEX grade boards should be specified as the face layer

    (i.e. the second layer in double layer linings). The

    application of two coats of Gyproc Drywall Sealer to the

    face lining will also provide a degree of vapour control.

    Please refer also to Timber noggings overleaf.

    Thermal propertiesIsover insulation is laid between the joists where required

    to provide the specified standard of thermal insulation.

    DESIGN

    Please refer to section Introduction - for general

    considerations.

    Planning - key factorsTo minimise the risk of ceiling finish defects occurring,

    seasoned timber with a moisture content not exceeding

    that recommended in BS 5268: Part 2: 2002 should be used.

    The contractor should ensure that timber supports are

    accurately spaced, aligned, and levelled. Consideration

    should be given to using Gyproc Drywall Timber Screws as

    the preferred method of fixing.

    Cavity barriersCavity barriers may be required to satisfy the requirements

    of national Building Regulations. Please refer to section

    - Cavity barriers.

    Strength and robustnessTimber should be aligned and level, and should meet the

    requirements of BS 5268: Part 2: 2002. The dimensions and

    assembly of timber supports should be sufficient to allow

    positive fixing of boards without bounce or undue

    deflection due to nailing, screwing, or other applied force.

    When the minimum joist width conditions cannot be met, a

    timber batten should be securely fixed to the side of those

    timber supports where ceiling boards butt in order to

    increase the bearing surface. Please refer to Joist width

    overleaf.

    Where plasterboards are fixed at maximum centres in

    adverse conditions the standard of lining can be affected.

    Adverse conditions can generally be described as conditions

    where high humidity occurs, principally in the cold, damp,

    autumn / winter period. They also refer to buildings under

    construction during this period where both the structure

    and wet applications such as plastering and screeding are

    subject to slow drying conditions.

    Where a polyethylene vapour control layer is included in

    the ceiling construction in conditions described previously,

    condensation can form on the polyethylene surface. This

    can result in plasterboard becoming unduly damp, and

    affecting the standard of acceptability of the lining and

    any applied plaster or textured coating.

    6.1

    6.7

    2.1

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    Imposed loadsThe designer should ensure that the floor construction is

    suitable to support any imposed loads.

    Timber noggingsSuitable timber noggings, normally 38mm x 38mm, may be

    required between joists and at the room perimeter to

    support board edges and board ends. The provision of

    noggings depends on the thickness of boards used, and the

    spacing of timber joists (please see Table 8). In addition, the

    need for noggings is also dependent on any fire resistance

    requirements, so Tables 2 and 7 must be referred to.

    Timber noggings should always be provided at the room

    perimeter except when using 15mm board or 19mm GyprocPlank in non-fire rated situations. When fixing DUPLEX grade

    boards providing vapour control noggings are required

    regardless of joist spacing or board thickness in order to

    ensure that vapour control integrity is maintained.

    In multi-layer plasterboard ceilings, the provision of

    noggings relates to the outer layer board only, unless

    otherwise stated.

    Nail poppingLoosening of nails in timber can occur through timber

    shrinkage (please see Fig 7), or as a result of fixing boards

    to misaligned or twisted framing. To reduce the risks,

    boards should be fixed tight to framing members.

    To minimise any risk of fixing defects occurring use Gyproc

    Drywall Timber Screws. If nails are the preferred fixing

    method, the risk of subsequent fixing defects can occur.

    Fixing to super-dried timber and engineered I beamsIt has been established by test that Gyproc Drywall Timber

    Screws are the best solution for fixing to standard softwood,

    super-dried timber (approximately 12% moisture content).

    If engineered I joists are to be used, please contact the joist

    manufacturer for fire resistance and sound insulation claims

    and for fixing recommendations.

    ServicesElectrical and other small service runs can be routed within

    the floor cavity. Services should be installed in accordance

    with standards, guidelines and recommendations.

    Fixtures / fittingsFixtures should be made into joists, or to supplementary

    timber.

    FinishingPlease refer to section - Finishing Coat Plasters,

    section - Jointing, and section - Decorative

    Effects.

    EstimatingThe estimated construction time is 15 - 20m2 / hour (single

    layer ceiling - boarding only) or 8 - 10m2 / hour (double

    layer ceiling - boarding only) ready for finishing.

    Table 8 - Provision of timber noggings*

    Board Maximum joist centresthickness with noggings without noggingsmm mm mm

    6 MultiBoard 450 400

    9.5 & 10 450 400

    12.5 600 450

    15 & 19 600 600

    *Tables 2 to 7 must also be referred to for fire resistant ceilings.

    2.2

    1.5

    2.5

    Joist widthWhere joist width is less than the minimum stated in Tables 2 - 7, the system may not meet its specifiedperformance.

    If the minimum fixing tolerances cannot be met, 50mm x

    25mm timber battens should be screw-fixed to the side of

    the joists where ceiling boards abut in order to extend the

    bearing surface.

    Fixing to timber framesA technical information sheet is available to download

    from our website: www.gypsum.ie

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    CONSTRUCTION DETAILS

    Fig 1 - Joists at 450mm centres using 12.5mm Gyproc WallBoard - board edge noggings not required unless stated in

    performance tables*

    900mm

    1800mm 450mm

    Fig 2 - Joists at 600mm centres using 12.5mm Gyproc WallBoard - board edge noggings required unless stated in

    performance tables*

    1200mm

    2400mm 600mm

    * Note: where Duplex grade boards are specified to provide vapour control, noggings are always required regardless of joist spacingand plasterboard thickness.

    * Note: where Duplex grade boards are specified to provide vapour control, noggings are always required regardless of joist spacingand plasterboard thickness.

    Room perimeter noggings required.

    Room perimeter noggings required.

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    Fig 3 - Joists at 600mm centres using 15mm Gyproc WallBoard - board edge noggings not required unless stated in the

    performance tables. Room perimeter noggings not required in non-fire rated situations*.

    2400mm 600mm

    1200mm

    Fig 4 - Twisting of standard soft wood timber joist on drying from 20% to 8% moisture content

    * Note: where Duplex grade boards are specified to provide vapour control, noggings are required regardless of joist spacing andplasterboard thickness.

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    Fig 5 - Fixing boards to trussed rafters

    Fig 6 - Fixing tolerances1

    35mm 25mm

    6mmminimum

    A

    Table 9 - Fixing plasterboard to timber supports

    Board Gyproc Drywall Timber Gyproc Nails to fixthickness Screws to fix board for plasterboard for direct

    direct decoration or decoration orplastering plastering

    mm mm mm

    9.5 32 3012.5 38 4015 38 4019 41 5012.5 over 12.5 51 5012.5 over 19 60 6515 over 15 60 6515 over 19 60 65

    1 Boards should be lightly butted with a maximum separation of3mm. Where a cut edge occurs, dimension A is 13mm minimum,.Where a bound edge occurs, dimension A would be 10mmminimum.

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