Roofs
Restraint Straps (Domestic Roofs)
Gable Restraint System
Class 1 Buildings/houses of single occupancy three storeys or less England & Wales and two storeys or less Scotland
Wider Cavity Wall Tie FT-125-150
GRB-100
PFS-1500-100-B
VRS-900-100
RST-3
Timber Gable to Masonry fixing detail to cold roofs – Continuous Wallplate
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 Cullen FT Timber frame wall ties Continuous wallplate 38mm min-100mm maximum depth
Roof insulation
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, Cullen VRS-900-100 strap
Mortar bed
Cullen RST-3 restraint straps at maximum 1200mm centre fixed to longitudinal truss bracing / additional longitudinal bracing with 8 no. 4 x 25mm steel screws fixed to gable panel stud with 3 no. 3.4 x 35 mm square twist nails
Cullen Gable Restraint Bracket (GRB) at maximum 1200mm centres
Cavity insulation shown for indicative purposes only - thermal bridging and SAP calculations are plot specific
Cavity trays and firestops to be detailed by building designer
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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.itwcoe.com
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