Cullen Restraint Straps Technical Guide 2025

PS RANGE Pre Formed Strap

The PS range provides required parallel restraint to block work for joist hangers and, where required, build–in details.

Applications can be found on pages 8 and 9

Features & Benefits — Strap suitable for various blockwork sizes (100-215mm) to include fire and party walls — Higher characteristic capacity values compared to competitor solutions, enabling straps to be installed at a maximum of 2 metre centres — Load values support floor opening details to meet NHBC requirements e.g. stairwell openings — Fewer fixings and connectors are required compared to competitors’ solution — Installation videos available for all detailed applications

PST–135

PST–220

Approvals — CE/UKCA marked in accordance with EN845-1 — Meets NHBC Technical requirements

Fixings Code

Description

Box Qty

PSB

547389 141185

3.4 x 35mm Square Twist Nails – LOOSE 3.4 x 35mm Square Twist Nails – COLLATED*

500

2,500

PSC–220

*For use with Paslode PPNXi

Available Sizes

4mm Ø holes Dimensions (mm)

Minimum Block Work Width (mm)

Maximum Block Work Width (mm)

Strap Material Thickness (mm)

F

Product Code

B (mm)

F (mm)

T (mm)

T

PST

PST–135

100

125

100

451.7

135

1.4

F

PST–220 PSC–220

140 100 n/a

215 215 n/a

100 100 100

536.7 536.7 451.7

230 220 135

3 3

T

PSC

PSB

1.4

Please refer to page 8 and 9 for guidance on strap requirement

F

T

PSB

Strap Selection

I–Joist Depth (mm)

Open Web Joist Depth (mm)

Hanger Depth

Hanger Depth

195/200

220

240

300

350/360

400

195/202

219/230

253/254

304

375/380

418/424

195 225 240 250 300 350 400

PST

195 225 240 250 300 350 400

PST

PST

PSC PST

PST

PSC PST PST

PST

PST

PST

PSC

PST

PSC

Load Data

Fixings

Performance

Characteristic Tensile Capacity (kN)

(3.4 x 35mm)

Built into 3.5N/mm 2 block work & nailed to min C16 grade timber**

8No

8.00

**Tested in accordance with the requirements of EN846-4 (with a vertical precompression of 0.4N/mm 2 to the top of the masonry specimen – equivalent to storey height of blockwork)

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 5

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