Floors
Roofs
Walls
Fixings
Whole system solution
Gable Restraint System
Developed in collaboration with national housebuilders, the Trussed Rafter Association, and industry partners, our innovative five‑part system provides a reliable solution for connecting timber gables to masonry walls.
Engineered solution
Designed for Safe and Compliant Load Transfer
The GRS system has been developed to safely transfer lateral wind loads from masonry and timber gable ends into the braced roof diaphragm, ensuring a secure connection between timber gable panels and masonry walls.
The system offers flexibility in design, with options for either a continuous wall plate or a stepped wall plate, where the gable wall plate is raised to suit the bottom chord depth of the truss. Both configurations are fully compliant with relevant building regulations and industry standards.
GRS System Components
The GRS System consists of five specified product components, each engineered to perform as part of a fully integrated system.
Features & Benefits
Complete System with Specified Products
Known for reliability and backed by a proven performance record in the construction industry
Warranty and insurance coverage included, offering long-term support
Supports Timber Gable End Systems
Minimises risks associated with working at height and handling heavy materials
Accelerates installation, allowing for a faster build time – up to 3% quicker for a standard 3-bed house
Provides cost savings of up to £1.8K on labour, materials, and equipment per gable end
Enhances thermal efficiency to meet U-Value standards, supporting compliance with Part L
Reduces the Risk of Gable End Collapses
Reinforces health and safety priorities by reducing downtime, H&S costs, and the risk of rework
Adds structural reliability, enhancing build quality and minimising collapse risks
TESTIMONIALS
What our customers are saying
Assists engineers by simplifying the structural arrangement at a tricky junction.
Trusted Rafter Association
Delivers a more robust system to prevent future collapse.
Taylor Wimpey
Less blockwork & more timber therefore improved sustainability credentials.
Barratt Developments
Compliance & Approvals
The system meets the requirements of:
NHBC Compliant
For houses up to five storeys in England and Wales, and four storeys in Scotland
TRA Endorsed
Building Regulations
Approved Document A
Scottish Building Regulations
(Domestic)
This NHBC‑accepted whole‑system solution combines Cullen Gable Restraint Brackets, restraint straps, and Paslode nail fixings, with all centres, spacings, and connections fully pre‑calculated.
Installed as specified, the system is underwritten by ITW Construction Offsite Europe, delivering built‑in compliance, reduced risk, and complete confidence on site.
Digital quantity PLanning Tool
Gable Restraint Estimation Tool
Cullens’ Gable Restraint System, backed by ITW Construction Offsite Europe, is a comprehensive, NHBC accepted solution that supports high-quality, efficient, and safe construction practices.
GRS System Installation
For installation support, browse our video library and access our technical guides for step‑by‑step guidance.
You can also contact our technical team for additional support.
Explore the Gable Restraint System Guide
Support you can rely on
Expert technical guidance and customer service, from design to site.