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Restraint Straps (Domestic Roofs) Horizontal Restraint (Masonry Gables)
Fixing to Longitudinal Truss Bracing (Fixed to Truss Web)
— Install PFS on the 25 x 100mm longitudinal truss bracing (1). — Ensure the position of the longitudinal bracing and strap coincide with the blocks vertical joint. — The 90deg bend of the strap is to be held tight against the cavity face of the inner leaf of blockwork (2), preferably located on the full block. Notch the blocks to accommodate the angle of the strap and ensure notch is fully mortared.
(2)
(1)
Fixing to Longitudinal Truss Bracing / Additional Longitudinal Binder (Fixed to Truss Web)
(3)
— Install PFS on the 25 x 100mm longitudinal truss bracing (1). — Ensure the position of the longitudinal bracing and strap coincide with a horizontal blockwork joint. — The 90deg bend of the strap is to be held tight against the cavity face of the inner leaf of blockwork (2), preferably located on a substantial piece of blockwork, i.e. over the centre of a full block, with a single cut block over the strap (3). Notch the blocks to accommodate the angle of the strap and ensure notch is fully mortared.
(1)
(2)
Fixing to Solid Noggins (Between Trusses)
— Ensure the position of the straps coincides with the horizontal blockwork joint. — Install PFS to underside of solid noggins (1). Noggins to be fixed horizontally to avoid twisting of the restraint straps. — The 90deg bend of the strap is to be held tight against the cavity face of the inner leaf of blockwork (2), preferably located on a substantial piece of blockwork, i.e. over the centre of a full block, with a single cut block over the strap (3). Notch the blocks to accommodate the angle of the strap and ensure notch is fully mortared. — Fix straps to noggins/trusses with 8no. 3.4 x 35mm square twist nails, evenly spaced along the length of the strap (for NHBC warrantied buildings, in accordance with NHBC Standards 2017 section 7.2.8, 4no. 50 x 4mm steel screws or 4no. 75 x 4mm round wire nails, with one fixing into the third rafter, shall be used instead of square twist nails).
(3)
(1)
(2)
Fixing to Longitudinal Truss Bracing / Additional Longitudinal Binder (Fixed to Truss Ceiling)
— Install PFS on the 25 x 100mm longitudinal truss bracing (1). Bracing to be fixed to each truss with 2no. 3.35 x 65mm round wire nails. — Ensure the position of the longitudinal bracing and strap coincide with a horizontal blockwork joint, where this is not possible inserted a cut block to suit strap location (4). — The 90deg bend of the strap is to be held tight against the cavity face of the inner leaf of blockwork (2), preferably located on a substantial piece of blockwork, i.e. over the centre of a full block.
(4)
(1)
(2)
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