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)
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.
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 straps are required for compliance with UK building regulations and NHBC technical requirements. Approvals
The latest version of the technical guide will always be the digital format on our website.
Technical support: 01592 771132 / technical@itwcp.com / https://www.itwcp-offsite.co.uk 3
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