Cullen Technical Guide 2024

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GRB Gable Restraint Bracket

The GRB is an engineered bracket that has been designed to provide a verified connection between a timber gable and masonry wall when used in conjunction with the Cullen Gable Restraint System*. Features & Benefits — Following the details from the system means no external engineering checks — Safely transfers the loads into the roof diaphragm

Patent Pending

Material Specification — Galvanised mild steel – Z600

Approvals — Meets NHBC Technical requirements* — Designed to meet Class 1 & Class 2A buildings of Approved document A*

Available Sizes

Wall Plate Width (mm)

Fixings 3.5 x 40mm Wood Screw – supplied by others

Product Code

Block Work Width (mm)

Mi nimum

Maximum

GRB–100

100

38

75

*To meet the requirements of the NHBC the GRB must be installed as a complete system with all associated products and fixings – Full specification and details of the Cullen Gable Restraint System can be found on pages 132 & 133.

In Situ

Gable panel Timber wallplate Mortar bed

Gable restraint bracket

Please note the GRB forms part of a system and must be used in conjunction with the system straps and fixings as shown on Pages 132-133

Masonry wall

Installation Instructions

Components:

Gable restraint brackets placed on wall at 1200mm** maximum centres (no fixings required).

10mm maximum mortar bed on wall prior to wallplate being fixed.

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

**For buildings up to 3 storey England & Wales and 2 storey Scotland

The latest most up to date version will always be online and not in print or in downloaded pdf.

134

Technical support 01592 771132 / technical@itwcp.com / https://www.itwcp-offsite.co.uk

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