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Restraint Straps (Domestic Floors)
Perpendicular Restraint
Floor Level
Detail
Region
Ground Floor
1st Floor
2nd Floor
England & Wales
PFS required at 2m max centres
Perpendicular
PFS required at 1.25m max centres
Scotland
PFS required at 2m max centres
PFS surface fixed to I–Joist
— Noggins to be installed between the I-Joists with 2No UZ-Clips staggered either side (Noggins to be minimum width of half the I-Joist depth, to a maximum of 150mm x minimum depth 38mm - min C16 grade timber) — Once nailed into position a skew nail is placed in the opposite corner to secure connection — After fitting all noggins the PFS strap can then be located tight to the block work and centred on the noggins — The strap should be nailed with a minimum of 8No 3.4 x 35mm square twist nails evenly spaced and into at least every joist — Strap must extend over a minimum 3No joists
— Only suitable when joists line through with top of block work
PFS through web of I–Joist
— Cut a small slot in the I–Joist web, just under the top flange — Slide the PFS through the slots and position tight against the block work — To provide a fixing for the PFS, noggins must be installed between the I-Joists (Noggins to be minimum depth of half the I-Joist depth, to a maximum of 150mm x minimum width 38mm - min C16 grade timber) — Each noggin should be nailed in place through the I–Joist web — The strap should be nailed with a minimum of 8No 3.4 x 35mm square twist nails evenly spaced into the noggins — Strap must extend over a minimum 3No joists
— Not suitable when joists line through with top of block work
PFS through web of Open Web Joist
— Strongback to be installed as per manufacturer’s guidelines — Position PFS tight to block work and centred on block — The strap should be nailed with a minimum of 8No 3.4 x 35mm square twist nails evenly spaced into the noggins — Strap must extend over a minimum 3No joists
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