Cullen Restraint Straps Technical Guide 2025

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

Floor Level

Detail

Region

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

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.

Scan or click to view installation videos

PSB strap with restraint hanger

— The strap should be nailed with a minimum of 8No 3.4x35mm Square Twist Nails into the joist bottom flange/chord

Floor Level

Detail

Region

Ground Floor

1st Floor

2nd Floor

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

Please refer to page 5 for further information on PSB straps

Scan or click to view installation videos

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

Floor Level

Detail

Region

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

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.

Scan or click to view installation videos

The latest version of the technical guide will always be the digital format on our website.

Technical support: 01592 771132 / technical@itwcp.com / https://www.itwcp-offsite.co.uk 9

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