Roofing Construction Screw – Heavy Duty Composite Sheet to Steel – 16mm Washer
From £11.02£13.22 EX VATINC VAT
Heavy duty roofing construction screws for fixing composite sheets to steel purlins. 5.5mm diameter with a 16mm bonded washer, available in six lengths from 75mm to 235mm. Sold in boxes of 50 or 100.
| Size | QTY | Price | QTY |
|---|---|---|---|
| 5.5 x 75mm | 100 | £11.02£13.22 | |
| 5.5 x 105mm | 100 | £13.57£16.28 | |
| 5.5 x 235mm | 50 | £26.95£32.34 | |
| 5.5 x 185mm | 50 | £16.80£20.16 | |
| 5.5 x 130mm | 100 | £16.83£20.20 | |
| 5.5 x 150mm | 100 | £19.89£23.87 |
When you are fixing composite roofing sheets to steel, you need a screw that can drill cleanly through insulated panels and bite securely into structural steel without fuss. These heavy duty roofing construction screws are built for exactly that job. The 5.5mm shank gives you the drilling power to handle the full panel thickness, and the 16mm bonded washer seals the penetration point, which is the bit that keeps the water out for the next twenty years.
Six lengths are available, from 75mm right up to 235mm, so you can match the screw to your panel build-up rather than compromising. Thinner composite sheets with shallow purlins take the shorter lengths. Deep insulated panels over heavier steel sections need the 130mm, 150mm, 185mm, or 235mm options. Getting that engagement depth right matters — too short and you have poor pull-out resistance, too long and you are just wasting material and drill torque.
Where These Heavy Duty Roofing Construction Screws Get Used
These are the go-to fixings for agricultural and industrial roofing work where composite or built-up panels are fixed to steel frames. That means portal frame buildings, barn conversions, warehouses, cold stores, and distribution units. They are also widely used in cladding work where panels run vertically and the fixing loads are different but the materials are the same. Anywhere you have a steel substructure and a profiled composite panel on top, this is the screw for the job.
Why the 16mm Washer Matters
The bonded EPDM washer is not a cosmetic detail. It compresses as the screw is driven home and forms a weathertight seal at the fixing point. On a roof that might see decades of thermal movement, rain, and wind uplift, a properly seated washer is what stands between a dry building and a call-out. Drive them flush, not overtight — crushing the washer defeats the purpose entirely. If you can see the rubber bulging out evenly around the head, you are at the right torque.
Pro Tip: Use a torque-limiting screwgun or a depth-stop bit when driving these in bulk — an overtightened washer that spins past the seal point looks fine from a distance but will weep in the first heavy rain.
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