Restraint Straps

Restraint Straps for Floor, Wall and Roof Tying

Restraint straps are heavy-duty steel components used to tie structural elements of a building together — connecting timber floors and roofs to masonry walls, providing lateral restraint, and resisting wind uplift forces. A fundamental fastener in domestic, commercial and industrial construction.

Spechunter stocks the Vista galvanised restraint strap range in heavy-duty (30 x 5mm) and light-duty (30 x 2.5mm) profiles, in 1000mm, 1200mm, 1300mm and 1600mm lengths with bend points at 100mm or 150mm to suit floor depth and connection geometry. UK trade pricing, free next-day delivery on orders over £200.

Where Restraint Straps Are Used

Restraint straps provide the lateral connection between masonry walls and the floors and roofs that abut them. Common applications include:

• Floor joist to wall — tying timber floor joists to the inner leaf of a cavity wall
• Wall plate to rafter — connecting roof rafters to the wall plate
• Gable end restraint — restraining gable walls back to roof structure
• Wall-plate to wall — tying down the wall plate itself to the masonry below

Heavy Duty vs Light Duty — Which to Specify

Heavy duty (30 x 5mm) — for primary structural restraint connections where higher load resistance is required. Vista's heavy-duty range is 5mm thick and provides robust performance for first-floor joist ties, wall plate connections and gable restraint.

Light duty (30 x 2.5mm) — for secondary applications, lighter floor structures, and where the strap is one of many redundant restraint connections. Vista's light-duty range is 2.5mm thick — half the weight of the heavy-duty range.

Bend Configuration

All Vista restraint straps come pre-formed with a 90° bend. Bend at 100mm suits standard 9-inch (225mm) brickwork courses and most domestic floor depths. Bend at 150mm is required for deeper floor builds and gable connections where the strap must wrap around a deeper section of masonry.

Length Selection

Choose strap length based on:

• 1000mm — single-joist tie, shorter spans, shallow gable connections
• 1200mm — most common length; spans 2-3 standard joists, suitable for typical domestic applications
• 1300mm — extended reach for joists at wider centres
• 1600mm — multi-joist ties, larger gable connections, longer spans across noggings

Material and Finish

All Vista restraint straps are galvanised mild steel — providing corrosion resistance for typical internal and most external applications. Pre-punched holes accept nails, screws or bolts for the timber-side fixing, and mortar-bedded fixing on the masonry side.

Installation Quick Reference

Restraint straps must be:

• Built into the masonry — not surface-mounted to plaster
• Fixed across multiple timber joists where running across floor joists
• Built into the masonry by a minimum of three brick courses
• Fully bedded in mortar to allow the strap to develop full tensile resistance
• Spaced per the project's structural specification (typically 2m centres in domestic construction)

A noggin or strut is required between joists where the strap crosses more than two joists, to prevent joist rotation under load.

Need Help Specifying?

If you're unsure which strap is right for your project, our specifier desk can advise on length, profile and quantity. Order before midday for next-day delivery on orders over £200 ex-VAT.