Cullen Technical Guide 2025

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HRS Head Restraint Screw

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The HRS is used for securing non-load bearing partitions to the floor structure and provides lateral restraint to the panel. Features & Benefits — Allows for joist/truss deflection​ — Reduces plasterboard cracking and fixing defects

— Screw design reduces squeaks​ — Plasterboard can be pre-installed​ — Guide to support installation​

In Situ

— Requires no pre-drilling Material Specification — Carbon steel screw​ — PA recyclable guide

Approvals — Meets NHBC Technical requirements

Dimensions (mm)

100

30

Load Data

Characteristic lateral load capacity per fixing (kN) Timber frame partition (C16min grade) - attached to engineerred joist

Maximum Gap Between (mm)

Product Code

Partition and joist or Partition and plasterboard (15mm max plasterboard)

Code

Description

Box Qty

546496

15

1

546496

PSTS 6.5 x 100 + Guide

100

Installation Instructions - Plasterboard pre-installed *Drive the screw until the thread is fully embedded in the joist ​

*Install the HRS at 1200mm centres maximum and ensure a minimum of two HRSs per partition, with a recommended edge distance of 200mm

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2

3

4

5

Drive the screw up (do not overdrive the screw)​

Position the guide against the partition header

Partially drive the screw vertically into the header

Remove the guide​

Insert a screw into the guide

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

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