Gable Restraint System
Restraint Straps (Domestic Roofs) Horizontal Restraint (Masonry Gables)
ITW Construction Products’ Cullen brand has been a leader in timber engineering connectors for over 40 years. In collaboration with industry partners, Cullen has developed the Gable Restraint System (GRS) featuring the Gable Restraint Bracket and restraint straps. This system ensures secure
transferring lateral wind loads safely into the braced roof diaphragm. Fully compliant with Building Regulations, NHBC Standards, and Scottish regulations, the GRS is a trusted, NHBC-accepted solution underwritten by ITW Construction Products when installed per our detailed guidance.
Fixing to Longitudinal Truss Bracing (Fixed to Truss Web)
— Install PFS on the 25 x 100mm longitudinal truss bracing (1). — Ensure the position of the longitudinal bracing and strap coincide with the blocks vertical joint. — The 90deg bend of the strap is to be held tight against the cavity face of the inner leaf of blockwork (2), preferably located on the full block. Notch the blocks to accommodate the angle of the strap and ensure notch is fully mortared.
(2)
(1)
connections between timber gables and masonry walls,
Fixing to Longitudinal Truss Bracing / Additional Longitudinal Binder (Fixed to Truss Web)
For wall tie, panel jointing & cavity tray details see our Gable Restraint System Technical Guide .
(3)
— Install PFS on the 25 x 100mm longitudinal truss bracing (1). — Ensure the position of the longitudinal bracing and strap coincide with a horizontal blockwork joint. — The 90deg bend of the strap is to be held tight against the cavity face of the inner leaf of blockwork (2), preferably located on a substantial piece of blockwork, i.e. over the centre of a full block, with a single cut block over the strap (3). Notch the blocks to accommodate the angle of the strap and ensure notch is fully mortared.
(1)
Please note the GRB forms part of a system and must be used in conjunction with the system straps and fixings as shown below.
The Gable Restraint System is comprised of the following specified products:
VRS-900-100
GRB-100
(2)
Fixing to Solid Noggins (Between Trusses)
— Ensure the position of the straps coincides with the horizontal blockwork joint. — Install PFS to underside of solid noggins (1). Noggins to be fixed horizontally to avoid twisting of the restraint straps. — The 90deg bend of the strap is to be held tight against the cavity face of the inner leaf of blockwork (2), preferably located on a substantial piece of blockwork, i.e. over the centre of a full block, with a single cut block over the strap (3). Notch the blocks to accommodate the angle of the strap and ensure notch is fully mortared. — Fix straps to noggins/trusses with 8no. 3.4 x 35mm square twist nails, evenly spaced along the length of the strap. Ensure a minimum of 2 fixings into noggin beyond the 3rd rafter (4).
(3)
(1)
Patent: EP567179
(4)
Establishes a verified connection between a timber gable and a masonry wall.
Provides a secure method of fixing wall plates to timber and masonry walls.
(2)
RST-3
PFS-1500-100-B
FT: The Timber Frame Wall Tie
Fixing to Longitudinal Truss Bracing / Additional Longitudinal Binder (Fixed to Truss Ceiling)
— Install PFS on the 25 x 100mm longitudinal truss bracing (1). Bracing to be fixed to each truss with 2no. 3.35 x 65mm round wire nails. — Ensure the position of the longitudinal bracing and strap coincide with a horizontal blockwork joint, where this is not possible inserted a cut block to suit strap location (4). — The 90deg bend of the strap is to be held tight against the cavity face of the inner leaf of blockwork (2), preferably located on a substantial piece of blockwork, i.e. over the centre of a full block.
(4)
(1)
A high-performance strap developed to resist uplift and provide lateral restraint for timber gables.
Delivers superior performance and exceptional flexibility, ideal for lateral restraint in floor and roof applications.
Restrains the external blockwork or brickwork back to the timber frame structure.
(2)
The latest version of the technical guide will always be the digital format on our website.
The latest version of the technical guide will always be the digital format on our website.
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Technical support: 01592 771132 / technical@itwcp.com / https://www.itwcp-offsite.co.uk 13
Technical support: 01592 771132 / technical@itwcp.com / https://www.itwcp-offsite.co.uk
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