130 www.gypsum.ie 5 ShaftWall™ ShaftWall™ Shaft and duct encasement system ShaftWall™ provides a lightweight, non-loadbearing fire-resistant structure to protect elements within the service cores of modern fast-track developments. It is also used to protect all forms of shafts and ducts in conventional buildings. The system provides a protective structure which can be incorporated at an early stage of the building before the building envelope is sealed. The system can also be built horizontally to provide a fire-rated membrane. StairWall is a derivative of the ShaftWall™ system which is used to protect stairwells. May 2008
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encasement system ShaftWall™ - Gyproc SHAFTWALL.pdfMinimal wall thickness from 80mm May 2008 1 Gypframe MF5 Ceiling Section (horizontal ShaftWall only) 19mm Gyproc CoreBoard firestops
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130
www.gypsum.ie
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Shaf
tWal
l™ ShaftWall™
Shaft and duct encasement system
ShaftWall™ provides a lightweight,non-loadbearing fire-resistantstructure to protect elements withinthe service cores of modern fast-trackdevelopments. It is also used to protectall forms of shafts and ducts inconventional buildings. The systemprovides a protective structure whichcan be incorporated at an early stageof the building before the buildingenvelope is sealed. The system canalso be built horizontally to provide afire-rated membrane. StairWall is aderivative of the ShaftWall™ systemwhich is used to protect stairwells.
● In high usage areas the face lining of Gyproc FireLine can be
substituted by Glasroc MultiBoard or Gyproc DuraLine to provide a
high impact resistant lining. Fire resistance will not be compromised
provided that an equivalent minimum thickness of board is used
● If required for aesthetic reasons, it is permitted to fix an additional
layer of 12.5mm Gyproc WallBoard to the exposed stud flanges on the
shaft side to provide a smooth, seamless surface
The following procedure relates to a60mm framework, with a 15mmdeflection head. Specific references aremade where the procedure for 70mm,92mm or 146mm frameworks differsfrom this. •The wall is installed from the room sidein one direction.
• Fix 62mm and 72mm Gypframe FloorChannel along their centre line to thefloor at 600mm centres with suitablefixings (by others).
• Fix 62mm and 72mm Gypframe HeadChannel aligned and plumb with thefloor channel at 300mm maximumcentres (unless fixing to Z sections whichare set at 600mm centres, when twofixings to each Z section must be used).
• Position the deeper flange of theGypframe 62mm ‘J’ Channel to the shaftor stairwell side.
• Apply continuous Gyproc FireStrip tothe centre line of the head channel priorto fixing to maintain fire performance.
For 92mm and 146mm framing,fix head and floor channel using tworows of staggered fixings, spaced at600mm in each row. Each row staggeredby 300mm.
•Cut the Starter Channel 15mm short ofthe measured distance between floor andhead channels in order to accommodate thedesigned deflection.
•Insert the Starter Channel into position,leaving a 15mm space at the head.maximum centres.
•For 62mm and 72mm framing,fix along the centre line to the verticalabutments at 600mm maximumcentres.
For 92mm and 146mm framing,fix Starter Channels to vertical abut-ments using two rows of staggered fix-ings, spaced at 600mm in each row.Each row staggered by 300mm.
•Cut Gypframe ‘I’ Studs and GyprocCoreBoard 15mm short of the measureddistance between floor and head channels.
• Insert first Gyproc CoreBoard betweenthe channels and push tightly into thevertical Starter Channel (use theGypframe ‘I’ Stud to temporarily andloosely support the opposite edge of theGyproc CoreBoard).
• Continue to insert Gyproc CoreBoardbetween channels and ‘I’ Studs.
•Fix Gypframe Starter Channels to steeldoor frames at 300mm maximum centres.
•Carry out adjustments of alignment to thevertical with the first Gyproc CoreBoard (allstuds must remain vertical throughout thefixing operation, and all cut ends of GyprocCoreBoard must be square cut for use at thebase and horizontal joints).
• For 62mm framing fix two vertical19mm x 122mm Gyproc CoreBoardfirestops (cut on site) between the websand behind the vertical flanges of thestuds and into the head channel. See‘Junction details – deflection heads’, later.
• For 72mm framing fix two horizontal19mm x 50mm Gyproc CoreBoardfirestops (cut on site) between the websand behind the vertical flanges of thestuds and into the head channel. See‘Junction details - deflection heads’, later.
• For 92mm and 146mm frameworkstwo head details are available for each.The simplified detail incorporating aGypframe Retaining Clip accommodatesdeflection in respect of initial buildingsettlement. Fix as follows:
• Friction fit a Retaining Clip into the topflanges of each Gypframe ‘I’ Stud so as toretain a single Gyproc CoreBoard firestopwithin the head channel. Use theGypframe G108 component with 92mmframing and Gypframe G109 with146mm framing.
•The alternative head detail canaccommodate deflection due to liveloads. This adopts a dropped soffit anduses two Gyproc CoreBoard firestops (cuton site) fixed horizontally to the web ofthe head channel. Use 19mm x 68mmfirestops with a 92mm framework and19mm x 122mm firestops with a 146mmframework. See ‘Junction details –deflection heads’, later.
• Position Gypframe G102 RetainingChannel in the Starter Channel (useGypframe G110 Retaining Channel in thecase of a 70mm framework andGypframe G105 Retaining Channel in thecase of a 92mm framework).
• Ensure that the Gypframe G102Retaining Channel is securely located inthe tabs when using 146mm framing.
• Push the Gypframe ‘I’ Stud into itspermanent position to secure the firstsection of core boards.
•To simplify the installation of the finalGyproc CoreBoard when workingbetween fixed points, cut boards to therequired width, (minimum 300mm), less10mm fitting tolerance. Insert the boardsby twisting the flange of the last stud.
• Fix base layer Gyproc FireLine boards toall framing members at 300mm centresusing the appropriate length Gyproc Jack-Point Screws.
• Fix outer layer Gyproc FireLine boards toall framing members at 300mm centres(200mm at external angles) using theappropriate length Jack-Point Screws.
• Stagger board joints between layers.
May 2008
• Cut lining boards 15mm short to allowfor the deflection. Do not fix into theflange of the head channel. See ‘Junctiondetails – deflection heads’, later.
• Where there is a horizontal joint in thelining boards, stagger end joints by600mm minimum between layers.• Install Gypframe GFS1 Fixing Strap orGypframe GFT1 Fixing ‘T’ progressivelybetween studs, to support the end jointsof single layer boards.
• Install Gypframe GFS1 Fixing Strapbetween board layers, to support endjoints, in double layer boarding.
• Penetrations of ShaftWall™ by services,ducts, control joints and generalopenings will require careful detailing.This is to ensure that the penetrationdoes not impair the fire resistance of thewall or act as a mechanism of fire spread.Specific construction details should bedetermined by the designer.
Sealed systems
Where ShaftWall™ is used to enclose airpressure ducts, Gyproc Sealant is used toseal potential airpaths.See ‘Junction details – Sealing air shaftsand service ducts’.
• Apply sealant to the inside face of therear flanges of Gypframe ‘I’ Studs, headchannel, floor channel and GypframeStarter Channels, prior to installingGyproc Core Board.
• Seal Gyproc CoreBoard firestops, whichare located over the horizontal joints inGyproc CoreBoard, by applying beads ofGyproc Sealant prior to fixing.
• Seal the first layer lining boards to theframework, applying Gyproc Sealant onlyto the face flange of the perimeterchannels.