Galvanised Clout Felt Nails – XL Head – 25kg Box

Galvanised clout felt nails are one of those things every roofer gets through by the bucketload, and running short mid-job is nobody’s idea of a good time. These XL head clout nails are supplied in a solid 25kg box, giving you the kind of bulk stock that keeps a crew going without constant reordering. The extra-large flat head is the key feature here — it spreads the load across the felt surface and stops the nail pulling through under tension, which is exactly what you want when you’re fixing roofing felt or underlay in any kind of weather.

Available in six sizes: 13mm, 20mm, 25mm, 30mm, 40mm and 50mm, all at 3.0mm shank diameter. That range covers everything from lightweight roofing membranes and sarking felt through to heavier underlays where you need a longer nail to get proper purchase into the timber beneath. The galvanised coating keeps rust at bay — important when these nails are sitting under felt on a roof and getting hit with whatever the British climate decides to throw at them.

Where Galvanised Clout Felt Nails Get Used

These are a staple on any roofing job. Roofers reach for the shorter lengths when fixing lightweight breathable membranes or standard roofing felt to timber battens, and the longer 40mm and 50mm options come into play on thicker decking or when there’s an older substrate that needs a bit more bite. They’re also used on timber-framed buildings for sarking boards, and some fixers use the shorter sizes for pinning insulation quilts and vapour barriers in roof spaces.

Why the XL Head Makes a Difference

Standard clout nails work fine for plenty of applications, but when the felt is under movement — thermal expansion, wind uplift, foot traffic during install — a larger head dramatically reduces the chance of pull-through. It’s a small detail that prevents callbacks. Twenty-five kilos goes a long way, but on a busy site with several roofers working at once, it’s not as much as it sounds. Buy two boxes and sleep soundly.