GABLE RESTRAINT SYSTEM TECHNICAL GUIDE · This NHBC accepted “whole system” solution...
Transcript of GABLE RESTRAINT SYSTEM TECHNICAL GUIDE · This NHBC accepted “whole system” solution...
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TECHNICAL GUIDEGABLE RESTRAINT SYSTEM
A brand of
NOW UP TO 5 STOREYS
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ITW Construction Products’ Cullen brand of timber engineering connectors has been synonymous with innovation and quality for over forty years. In collaboration with national housebuilders, the Trussed Rafter Association and industry partners, ITWs technical experts have created an innovative system featuring the Cullen Gable Restraint Bracket for a complete solution to connect timber gables to masonry walls.
The details have been developed to safely transfer lateral wind load on the masonry and timber gable ends into the braced roof diaphragm. This provides a verified connection between timber gable panels to masonry walls. The details give an option to have a continuous wall plate or a stepped wallplate with the gable wall plate being raised to suit the bottom chord depth of the truss. Either of the details meets the minimum requirement of Building Regulations 2010 approved document A, Scottish Building regulations domestic, NHBC Standards for houses of five storeys or less in England and Wales and four storeys or less in Scotland. Both details are accepted by NHBC.
This NHBC accepted “whole system” solution incorporating the Cullen Gable Restraint Bracket and restraint straps including Paslode nail fixings with all centres, spacings and connections already calculated means that whenever our detail is followed the system is underwritten by ITW Construction Products.
Gable Restraint System
Gable Restraint Bracket Installation
Gable Restraint Bracket & Application
10mm maximum mortar bed on wall prior to wallplate being fixed.
Components:
Patent Pending
Gable restraint brackets placed on wall at 1200mm* maximum centres (no fixings required).
*for buildings up to 3 storey England & Wales and 2 storey Scotland
38-75mm wallplate bedded on mortar and fixed to gable restraint brackets with 3.5x40mm wood screws (2 no. per bracket).
— Wallplate
— Mortar
— Gable Restraint Brackets
— Wall
Gable panel
Timber wallplate
Mortar bed
Masonry wall
Gable restraint bracket
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225m
m M
AX
Gable Panel
Breather membrane toface of gable panel
Cullen FT Timber framewall ties
Continuous wallplate38mm min-75mmmaximum depthMortar bed
Cullen Gable RestraintBracket (GRB) atmaximum 1200mmcentres
Cavity insulation shownfor indicative purposesonly - thermal bridgingand SAP calculations tobe plot specific
Solid blocking between truss andgable panel at horizontal restraintstrap positions
Gable Panel to wallplate fixing -Paslode 3.1mm dia x min 75mmlong smooth shank nails atmaximum 175mm centres
Vertical holding down strap pluggedand screwed to blockwork atmaximum 1.8m centresEither VRS-900-100 or PFS-1200-F /LDGS-1200-F
225mm maximum heightbetween underside ofwallplate and horizontalrestraint strap
Roof insulation
Longitudinal truss bracing
Level of truss wallplate
Cullen RST-3 restraint straps at maximum 1200mm centrefixed to longitudinal truss bracing / additional longitudinal bracing with 8no. 4x25mm steel screws fixed to gable panel stud with 3no. 3.4x35mm square twist nails
Insulation continued intogable panel
Vertical restraint strap tobe face fixed to verticalstud with 4no. 3.4x35mmsquare twist nails
Cavity trays and firestopsto be detailed by buildingdesigner
Continuous wallplate38mm min-75mmmaximum depth
Cullen Gable RestraintBracket (GRB) atmaximum 1200mmcentres
Mortar bed
1800mm maximumVertical restraint strap plugged and screwed toblockwork at maximum 1.8m centres either -Cullen VRS-900-100 installed to top of gable panelbottom railorCullen PFS-1200-F / LDGS-1200-F nailed to face of gablepanel vertical studs.
Cullen RST-3 restraint straps at maximum1200mm centresfixed to additional longitudinal bracingwith 8no. 4x25mm steel screwsfixed to gable panel stud with 3no.3.4x35mm square twist nails
or
Bottom rail of gablepanel
Truss profile
Vertical restraint strap to be face fixed to vertical stud with 4no. 3.4x35mm square twist nails
or
Cullen VRS-900-100 fixed to top of bottom rail with 4no. 3.4x35mm square twist nails
Gable Panel (with orwithout gable ladder)
2000m
m max
2000m
m max
2000m
m max
Cullen PFS restraint straps fixed to solid timber nogginsbetween trusses at maximum 2000mm centres with3.4x35mm square twist nails, 8no. to noggins and 4no.to gable panel (2no. top face & 2no. cavity face)
1200mm max
1200mm max 1200mm max 1200mm max
Gable Panel (withoutgable ladder)
2000m
m max
2000m
m max
Class 1 Buildings / houses of single occupancy three storeys or less England & Wales and two storeys or less Scotland
Timber Gable to Masonry fixing detail to cold roofs - Continuous Wallplate
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Gable Restraint System
Class 1 Buildings / houses of single occupancy three storeys or less England & Wales and two storeys or less Scotland
Timber Gable to Masonry fixing detail to cold roofs - Raised Gable Wallplate
Gable Panel
Breather membrane toface of gable panel
Cullen FT Timber framewall ties
Wallplate 38mmmin-75mm maximumdepth
Mortar bed
Cullen Gable RestraintBracket (GRB) atmaximum 1200mmcentres
Cavity insulation shownfor indicative purposesonly - thermal bridgingand SAP calculations tobe plot specific
Cullen PFS-1500-100-Bhorizontal restraint strap
Insulation continued intogable panel
Roof insulation
Longitudinal trussbracing (depth can varyto suit blockwork level)
Level of truss wallplateLevels to be adjusted toensure top of bracinginline with top ofblockwork
Solid blocking between truss andgable panel at horizontal restraintstrap positions
Gable Panel to wallplate fixing -Paslode 3.1mm dia x min 75mmlong smooth shank nails atmaximum 175mm centres
Vertical holding down strap pluggedand screwed to blockwork atmaximum 1.8m centresEither VRS-900-100 or PFS-1200-F /LDGS-1200-F
Vertical restraint strap tobe face fixed to verticalstud with 4no. 3.4x35mmsquare twist nails
Cavity trays and firestopsto be detailed by buildingdesigner
Cullen PFS restraintstraps fixed tolongitudinal truss bracing/ additional longitudinalbracing at maximum 2mcentres with 8no.4x25mm steel screws
Cullen Gable RestraintBracket (GRB) atmaximum 1200mmcentres
1800mm maximumVertical restraint strap plugged and screwed toblockwork at maximum 1.8m centres either -Cullen VRS-900-100 installed to top of gable panelbottom railorCullen PFS-1200-F / LDGS-1200-F nailed to face of gablepanel vertical studs.
Cullen PFS restraintstraps bedded in mortarjoint between top ofmasonry and wallplateand fixed to longitudinaltruss bracing maximum2000mm centres with8no. 4x25mm steelscrews
or
Vertical restraint strap tobe face fixed to verticalstud with 4no. 3.4x35mmsquare twist nails
or
Cullen VRS-900-100 fixedto top of bottom rail with4no. 3.4x35mm squaretwist nails
Truss profile
2000m
m max
2000m
m max
2000m
m max
1200mm max
2000mm max
2000m
m max
2000m
m max
Gable Panel (with orwithout gable ladder)Cullen PFS restraint straps fixed to solid timber noggins
between trusses at maximum 2000mm centres with 3.4x35mm square twist nails, 8no. to noggins and 4no. to gable panel (2no. top face & 2no. cavity face)
1200mm1 max1200mm1 max
Gable Panel (withoutgable ladder)
Bottom rail of gablepanel
Continuous wallplate38mm min-75mmmaximum depth
Mortar bed
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Class 2a Buildings / houses of single occupancy five storeys or less England & Wales and four storeys or less Scotland
Timber Gable to Masonry fixing detail to cold roofs - Continuous Wallplate
225m
m M
AX
Gable Panel
Breather membrane toface of gable panel
Cullen FT Timber framewall ties
Continuous wallplate38mm min-75mmmaximum depthMortar bed
Cullen Gable RestraintBracket (GRB) atmaximum 750mmcentres
Cavity insulation shownfor indicative purposesonly - thermal bridgingand SAP calculations tobe plot specific
Solid blocking between truss andgable panel at horizontal restraintstrap positions
Gable Panel to wallplate fixing -Paslode 3.1mm dia x min 75mmlong smooth shank nails atmaximum 100mm centres
Vertical holding down strap pluggedand screwed to blockwork atmaximum 1.8m centresEither VRS-900-100 or PFS-1200-F /LDGS-1200-F
225mm maximum heightbetween underside ofwallplate and horizontalrestraint strapInsulation continued intogable panel
Vertical restraint strap tobe face fixed to verticalstud with 4no. 3.4x35mmsquare twist nails
Cavity trays and firestopsto be detailed by buildingdesigner
Roof insulation
Longitudinal truss bracing
Level of truss wallplate
Cullen RST-3 restraint straps at maximum 750mm centresfixed to longitudinal truss bracing / additional longitudinal bracing with 8no. 4x25mm steel screws fixed to gable panel stud with 3no. 3.4x35mm square twist nails
Continuous wallplate38mm min-75mmmaximum depth
Cullen Gable RestraintBracket (GRB) atmaximum 750mmcentres
Mortar bed
1800mm maximumVertical restraint strap plugged and screwed toblockwork at maximum 1.8m centres either -Cullen VRS-900-100 installed to top of gable panelbottom railorCullen PFS-1200-F / LDGS-1200-F nailed to face of gablepanel vertical studs.
or
750mm max 750mm max 750mm max 750mm max
800mm max 800mm max 800mm max 800mm max 800mm max
Truss profile
Vertical restraint strap to be face fixed to vertical stud with 4no. 3.4x35mm square twist nails
or
Cullen VRS-900-100 fixed to top of bottom rail with 4no. 3.4x35mm square twist nails
1250m
m max
1250m
m max
Gable Panel (withoutgable ladder)
Cullen PFS restraint straps fixed to solid timber noggins between trusses at maximum 1250mm centres with 3.4x35mm square twist nails, 8no. to noggins and 4no. to gable panel (2no. top face & 2no. cavity face)
Cullen RST-3 restraint straps at maximum800mm centres fixed to additional longitudinal bracing with 8no. 4x25mm steel screwsfixed to gable panel stud with 3no.3.4x35mm square twist nails
Gable Panel (with orwithout gable ladder)
Bottom rail of gablepanel
1250m
m max
1250m
m max
1250m
m max
1250m
m max
1250m
m max
1250m
m max
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Gable Restraint System
Class 2a Buildings / houses of single occupancy five storeys or less England & Wales and four storeys or less Scotland
Timber Gable to Masonry fixing detail to cold roofs - Raised Gable Wallplate
Gable Panel
Breather membrane toface of gable panel
Cullen FT Timber framewall ties
Wallplate 38mmmin-75mm maximumdepth
Mortar bed
Cullen Gable RestraintBracket (GRB) atmaximum 750mmcentres
Cavity insulation shownfor indicative purposesonly - thermal bridgingand SAP calculations tobe plot specific
Cullen PFS-1500-100-Bhorizontal restraint strap
Insulation continued intogable panel
Roof insulation
Longitudinal trussbracing (depth can varyto suit blockwork level)
Level of truss wallplate
Cullen PFS restraintstraps fixed tolongitudinal truss bracing/ additional longitudinalbracing at maximum1.25m centres with 8no.4x25mm steel screws
Levels to be adjusted toensure top of bracinginline with top ofblockwork
Solid blocking between truss andgable panel at horizontal restraintstrap positions
Gable Panel to wallplate fixing -Paslode 3.1mm dia x min 75mmlong smooth shank nails atmaximum 100mm centres
Vertical holding down strap pluggedand screwed to blockwork atmaximum 1.8m centresEither VRS-900-100 or PFS-1200-F /LDGS-1200-F
Vertical restraint strap tobe face fixed to verticalstud with 4no. 3.4x35mmsquare twist nails
Cavity trays and firestopsto be detailed by buildingdesigner
Continuous wallplate38mm min-75mmmaximum depth
Cullen Gable RestraintBracket (GRB) atmaximum 750mmcentres
Mortar bed
1800mm maximumVertical restraint strap plugged and screwed toblockwork at maximum 1.8m centres either -Cullen VRS-900-100 installed to top of gable panelbottom railorCullen PFS-1200-F / LDGS-1200-F nailed to face of gablepanel vertical studs.
Cullen PFS restraintstraps bedded in mortarjoint between top ofmasonry and wallplateand fixed to longitudinaltruss bracing maximum1250mm centres with8no. 4x25mm steelscrews
or
Vertical restraint strap tobe face fixed to verticalstud with 4no. 3.4x35mmsquare twist nails
or
Cullen VRS-900-100 fixedto top of bottom rail with4no. 3.4x35mm squaretwist nails
Truss profile
750mm max 750mm max 750mm max 750mm max
1250mm max1250mm max
1250m
m max
1250m
m max
1250m
m max
1250m
m max
1250mm max
Gable Panel (with orwithout gable ladder)Cullen PFS restraint straps fixed to solid timber noggins
between trusses at maximum 1250mm centres with 3.4x35mm square twist nails, 8no. to noggins and 4no. to gable panel (2no. top face & 2no. cavity face)
1250m
m max
1250m
m max
1250m
m max
Gable Panel (withoutgable ladder)
Bottom rail of gablepanel
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