Restraint Straps (Domestic Floors)
PST strap with non–restraint hanger
— The strap should be nailed with a minimum of 8No 3.4x35mm Square Twist Nails into the joist top flange/chord
Lateral restraint of the walls can be provided by the floor, the restraint must be provided parallel and perpendicular to the floor joists.
Floor Level
Detail
Region
Ground Floor
1st Floor
2nd Floor
ROOF
Non–Restraint Hangers (JHI/JHIR/ RB–JHI/RB–JHIR)
England & Wales
PST or PSC required at 2m max centres
The type of restraint straps required and the centres at which they are placed depend on the joist end detail and region in which the house is built. Parallel restraint straps run along the same direction as the floor joists. Perpendicular restraint straps run across, or at a right angle to, the floor joists.
PST or PSC required at 2m max centres
PST or PSC required at 1.25m max centres
Scotland
Please refer to page 5 for further information on PST/PSC straps and table for the correct hanger / strap combination.
3RD STOREY
2ND FLOOR
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2ND STOREY
1ST FLOOR
PSB strap with restraint hanger
1ST STOREY
— The strap should be nailed with a minimum of 8No 3.4x35mm Square Twist Nails into the joist bottom flange/chord
GROUND FLOOR
Floor Level
Detail
Region
Ground Floor
1st Floor
2nd Floor
3 STOREY HOUSE
PSB required at 2m max centres PSB required at 1.25m max centres
Restraint Hang- ers (RA/HRAD/ RADS)
No additional restraint is required (additional PSB straps required each side of opening where openings exceed 600mm)
England & Wales
Scotland
The information we provide has been compiled using the minimum requirement from Building Regulations 2010 approved document A, Scottish Building regulation domestic, NHBC standards and British Standard BS 5628–1;2005 Annex D.
Please refer to page 5 for further information on PSB straps
These have been issued as guidance only, the overall responsibility lies with the Building Designer. For 3rd floor and above please refer to the building standards or building designer for guidance. All straps require a full storey of block work above to achieve the full 8kN declared load capacity.
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Parallel Restraint
PSB strap with built in detail
PSC strap with non–restraint hanger
— The strap should be nailed with a minimum of 8No 3.4x35mm Square Twist Nails into the joist top flange/chord
— The strap should be nailed with a minimum of 8No 3.4x35mm Square Twist Nails into the joist bottom flange /chord
Floor Level
Floor Level
Detail
Region
Detail
Region
Ground Floor
1st Floor
2nd Floor
Ground Floor
1st Floor
2nd Floor
Non–Restraint Hangers (JHI/JHIR/ RB–JHI/RB–JHIR)
England & Wales
PST or PSC required at 2m max centres
Where joists have a minimum bearing of 90mm no additional restraint is required (additional PSB straps required each side of opening where openings exceed 600mm)
PSB straps required at 2m max centres
England & Wales
Built in
PST or PSC required at 2m max centres
PST or PSC required at 1.25m max centres
Scotland
Scotland
Please refer to page 5 for further information on PST/PSC straps and table for the correct hanger / strap combination.
Please refer to page 5 for further information on PSB straps
Scan or click to view installation videos
Scan or click to view installation videos
The latest version of the technical guide will always be the digital format on our website.
The latest version of the technical guide will always be the digital format on our website.
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Technical support: 01592 771132 / technical@itwcp.com / https://www.itwcp-offsite.co.uk 9
Technical support: 01592 771132 / technical@itwcp.com / https://www.itwcp-offsite.co.uk
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