Cullen's Head Restraint Screw - The First Engineered Solution to Enter the UK Market

The HRS is a screw & guide solution that connects a non-load-bearing partition to the joist above.

The unique screw design accommodates a 14mm deflection gap and its smooth section allows for vertical movement, reducing floor squeaking.

Winner of a Roofscape Design Award 2025

What makes the HRS

a unique solution?

Allows joist & truss deflection in compliance with NHBC Requirements

Enables for plasterboard to be pre-installed

Eliminates the need for pre-drilling

What makes

the HRS a unique solution?

Click Here to View the Features & Benefits Video

Reduces squeaks, plasterboard cracking & fixing defects

Requires only ONE type of fixing

Includes a 100% recyclable guide for straight installation

Watch the Features & Benefits Video

Includes a 100% recyclable guide for straight installation

For more detailed guidance, we recommend watching our Installation video:

If you'd prefer to watch our Installation video for further instructions, access it here:

Technical Specifications

To explore the complete technical details for the HRS, you can easily browse the Cullen Technical Guide below.

Cullen Technical Guide 2025

2025 NHBC Requirements

The NHBC Standards updates introduced in January 2025 bring a number of changes. On the right are two key updates we would like to draw your attention to:

The NHBC Standards updates introduced in January 2025 bring a number of changes. On the right are two key changes we would like to draw your attention to:

Download HRS Flyer

Standard 6.3.9.3 – Construction of Timber Partitions -Fixing

"Where partitions are non load-bearing, allowance should be made for floors, ceilings or roofs to deflect as necessary, so that the partition does not become load-bearing, in accordance with the design."

Standard 6.4.9 – Timber Joist Performance

"A maximum deflection of 14mm where strutting is provided, or 12mm where strutting is not provided."

Cullen's NEW Engineered Screw & Guide Solution is Designed to Help You Meet the 2025 NHBC Standards.

Standard 6.3.9.3

Construction of Timber Partitions - Fixing

"Where partitions are non load-bearing, allowance should be made for floors, ceilings or roofs to deflect as necessary, so that the partition does not become load-bearing, in accordance with the design."

Standard 6.4.9

Timber Joist Performance

"A maximum deflection of 14mm where strutting is provided, or 12mm where strutting is not provided."

Cullen's NEW Engineered Screw & Guide Solution is Designed to Help YOU Meet the 2025 NHBC Standards.

Contact Us

1 Wheatstone Place,

Southfield Industrial Estate,

Glenrothes,

Fife KY6 2SW

United Kingdom

1 Wheatstone Place,

Southfield Industrial Estate,

Glenrothes,

Fife KY6 2SW

United Kingdom

Email us at

[email protected]

Email us at [email protected]

Call us on

+44(0) 1592 771 132

Call us on

+44(0) 1592 771 132

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Part of ITW and ITW Construction Products

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Privacy & Legal Information