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Restraint Straps (Domestic Roofs)
Restraint (Timber Gables)
Timber Gable to Masonry fixing detail to cold roofs – Continuous Wallplate Class 1 Buildings/houses of single occupancy three storeys or less England & Wales and two storeys or less Scotland
Vertical restraint strap to be face fixed to vertical stud with 4no. 3.4x35mm square twist nails
Gable Panel
225mm maximum height between underside of wallplate and horizontal restraint strap
Insulation continued into gable panel
Breather membrane to face of gable panel
Roof insulation
Cullen FT Timber frame wall ties Continuous wallplate 38mm min-75mm maximum depth Mortar bed Cullen Gable Restraint Bracket (GRB) at maximum 1200mm centres Cavity insulation shown for indicative purposes only – thermal bridging and SAP calculations to be plot specific Cavity trays and firestops to be detailed by building designer
Longitudinal truss bracing
Level of truss wallplate
Solid blocking between truss and gable panel at horizontal restraint strap positions Gable Panel to wallplate fixing – Paslode 3.1mm dia x min 75mm long smooth shank nails at maximum 175mm centres Vertical holding down strap plugged and screwed to blockwork at maximum 1.8m centres Either VRS-900-100 or PFS-1200-F
Cullen RST-3 restraint straps at maximum 1200mm centre fixed to longitudinal truss bracing / additional longitudinal bracing with 8no. 4x25mm steel screws fixed to gable panel stud with 3no. 3.4x35mm square twist nails
Details for a raised wall plate & Class 2A buildings can be found in our Gable Restraint System Technical Guide . https://www.itwcp-offsite.co.uk/download/cullen-gable-restraint-system-technical-guide/?wpdmdl=6414 Please contact our Technical department if you require further information.
The latest most up to date version will always be online and not in print or in downloaded pdf.
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Technical support 01592 771132 / technical@itwcp.com / https://www.itwcp-offsite.co.uk
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