Restraint Straps by Cullen Cullen’s restraint straps are engineered for durability and performance, offering essential structural stability across various applications. Interdependent tested to the requirements of BS EN845-1, accepted by the NHBC and compliant with Approved Document A of the UK Building Regulations, these straps meet the highest standards for safety and load resistance in residential and commercial builds. Whether for securing timber or masonry structures, our restraint straps provide effective, code-compliant solutions for preventing lateral movement in walls, floors, and roofs. With rigorous testing and certification, Cullen restraint straps are designed to ensure ease of installation, reliability, and long-term stability.
Parallel Restraint (Domestic Floors)
Parallel restraint refers to the measures taken to prevent lateral movement of walls by transferring external wind forces into the floor diaphragm. This is achieved using straps installed parallel to the floor joists.
Perpendicular Restraint (Domestic Floors)
PFS
PS RANGE
Perpendicular restraint refers to the measures taken to prevent lateral movement of walls by transferring external wind forces into the floor diaphragm. This is achieved using straps installed perpendicular to the floor joists.
Vertical Restraint (Domestic Roofs)
Vertical restraint focuses on preventing uplift forces, such as those caused by wind, from detaching roof elements from the supporting walls. Straps provide a secure connection between the roof and the structure below, ensuring the roof remains firmly in place.
Delivers superior performance and exceptional flexibility, ideal for lateral restraint in floor and roof applications.
The PS range provides required parallel restraint to block work for joist hangers and, where required, build–in details.
RST
VRS
Horizontal Restraint (Domestic Roofs)
Horizontal restraint resists wind forces, maintaining the alignment and stability of the roof structure. This is typically achieved with straps and roof bracing that counteract wind forces and prevent the roof from distorting under load.
*Straps highlighted in blue for visual purposes only
The VRS is an engineered strap that has been designed to provide a convenient and secure method of fixing wall plates to timber and masonry walls.
A high-performance strap developed to resist uplift and provide lateral restraint for timber gables.
The straps are required for compliance with UK building regulations and NHBC technical requirements. Approvals
Compliance The information we provide has been compiled using the minimum requirement from Building Regulations 2010 approved document A, Scottish Building regulation domestic, NHBC standards.
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 3
Technical support: 01592 771132 / technical@itwcp.com / https://www.itwcp-offsite.co.uk
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