• Use all specified fasteners.
• Horizontal lateral restraint straps should be spaced not more than 2m centres and attached to at least 3 timber members through the use of noggings and packing.
• Attach to timber members using specified fasteners. The bend length should be a minimum of 100mm and should be positioned at the centre of an uncut block or brick. 
• Vertical restraint strapping should be at least 1m long.
• Where straps are fixed to masonry, hardened nails Ø4mm x 75mm long or wood screws into plastic plugs Ø5.5 x 50mm long should be used. The lowest fixing should be located within 150mm of the bottom of the vertical strap.

Non standard straps are available to order.

• To order: Specify model series, overall length, bend (B) dimension and/or twist (T) dimension.
• Example: Heavy strap that has an overall length of 1m, a bend at 10cm and a twist at 20cm. (See illustration for detail on measuring bend & twist dimensions).

• Horizontal lateral restraint straps should be spaced not more than 2m centres and attached to at least 3 timber members through the use of noggings and packing.
• Attach to timber members using a minimum of 8 no. 3.75 x 30mm square twist nails. The bend length should be a minimum of 100mm and should be positioned at the centre of an uncut block or brick.
• The downturn of strap is to be held tight against the cavity face of the inner leaf of blockwork.

Fixing to solid noggings

• Straps to be installed at not more than 2m centres (or 1.25m where appropriate) along pitch of gable end.
• Ensure the position of the straps coincides with the block bed joint.
• Install HES or H strap to underside of solid noggings. Noggings to be fixed horizontally to avoid twisting of the restraint straps. (1)
• The downturn of strap is to be held tight against the cavity face of the inner leaf of blockwork (2), preferably located and bedded on a substantial piece of blockwork, i.e. over the centre of a full block, with a single cut block over the strap. (3)
• Fix straps to noggings/trusses with eight 3.75 x 30mm square twist nails, evenly distributed along the length of the strap. (For NHBC warrantied buildings, in accordance with NHBC Standards 2017, section 7.2.8, four 50mm (minimum) x 4mm steel screws or four 75mm x 4mm round wire nails, with one fixing into the third rafter, shall be used instead of the square twist nails).
• Strap to be of sufficient length to be fixed to a minimum of three trusses.

Fixing to longitudinal binder to truss rafter

• Straps to be installed at not more than 2m centres (or 1.25m where appropriate) along pitch of gable end.
• Install HES or H strap on the 25 x 100mm longitudinal Rafter bracing (1).
• Where the position of the strap does not coincide with an existing longitudinal binder, and block bed joint, then the strap can be fixed to an additional 25 x 100mm binder. The binder is to be fixed over four trusses and nailed twice to each rafter with 3.35 x 65mm round wire nails.
• Ensure the position of the additional binder and strap coincide with the block bed joint. 
• The downturn of strap is to be held tight against the cavity face of the inner leaf of blockwork (2), preferably located and bedded 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 block to accommodate the twist of the strap and ensure notch is fully mortared).
• Fix straps to bracing with eight 3.75 x 30mm square twist nails, evenly distributed along the length of the strap (For NHBC warrantied buildings, in accordance with NHBC Standards 2017, section 7.2.8, eight 25mm x 4mm steel screws shall be used instead of the square twist nails). 
• Strap to be of sufficient length to be fixed to a minimum of three trusses.

Vertical application

• Fix LES or L strap to wall plate with 3 no. 3.75 x 30mm square twist nails and to masonry with 5 off dia. 5.5 x 50mm wood screws, plugged and screwed into masonry.
• The lowest fixing should be located within 150mm of the bottom of the vertical strap.
• Where L strap is fixed to truss, install with 3.75 x 30mm square twist nails, quantity depending on required uplift values.