Why choose Impact Wood Screws 5.0 x 100mm

Impact Wood Screws 5.0 x 100mm are long, high-strength timber fixings designed for
structural and deep-fix applications in roofing, carpentry and leadwork substrate construction.
The zinc yellow passivated finish offers practical corrosion resistance for internal and sheltered
external use, while the impact-ready drive allows fast, consistent installation with modern impact drivers.

The 100mm length is intended for situations where secure penetration into structural timber is essential —
fixing firrings into joists, tying timber members together, or securing built-up substrates where shorter
screws cannot achieve adequate purchase. Stable substrates are critical to the long-term performance of
roofing systems and lead coverings.

Key benefits

• Deep fixing capability: 100mm length suits structural and multi-layer timber build-ups.
• Strong holding power: 5.0mm diameter provides excellent pull-out resistance.
• Impact compatible: Designed for efficient installation with impact drivers.
• Zinc yellow passivation: Added protection for routine site conditions.
• Trade efficiency: Tub of 800 balances quantity with manageable handling.

Typical uses on site

Impact Wood Screws 5.0 x 100mm are commonly used for fixing firrings, joists,
noggins and timber framing, as well as securing roof-deck build-ups and structural carpentry.
They are particularly useful in refurbishment work where multiple layers must be fixed back
to existing structural members.

Good practice & workmanship

Select screw length and diameter to suit timber thickness and design loads. Drive screws straight
and avoid over-tightening, which can crush timber fibres and reduce long-term holding performance.
Where timber supports roofing membranes or lead coverings, consistent fixing patterns help reduce
movement, deflection and joint telegraphing.

At a glance — Impact Wood Screws 5.0 x 100mm

Always follow project specifications and fixing schedules. Choose screw length to ensure
adequate penetration into structural timbers.

Using Impact Wood Screws 5.0 x 100mm in roofing and leadwork substrates

In roofing construction, long-term performance depends on a stable, well-fixed substrate.
Impact Wood Screws 5.0 x 100mm are commonly used where firrings, packers or
multiple layers must be fixed securely back to joists or rafters.

The additional length helps achieve reliable fixing through thick build-ups, reducing the
risk of substrate movement and deflection. This stability is particularly important where
lead sheet and roofing membranes rely on the substrate to accommodate thermal movement
without distortion.