Roofing Screw — Metal Roofing with EPDM Seal
Roofing screws are self-drilling screws specifically designed for metal roofing and cladding. They feature a hex washer head with a bonded EPDM rubber seal that compresses against the roof panel to prevent water ingress. Painted heads in RAL colors are standard for matching roof color.
Specifications
| Head | Hex washer with bonded EPDM seal |
|---|---|
| Point | Self-drilling #2 or #3 (for typical purlin thicknesses) |
| Coating | Ruspert (1000+ hr salt spray, standard), Painted RAL color over Ruspert, Bi-metal stainless |
| Common Sizes | 5.5 × 25 mm, 5.5 × 32 mm, 6.3 × 60 mm, 6.3 × 80 mm |
| RAL Colors | Standard architectural RAL palette: red, green, blue, white, black, brown, etc. |
Frequently Asked Questions
How tight should I drive a roofing screw?
Just enough to compress the EPDM washer until it slightly bulges out from under the head — typically the washer should be visible just at the edge. Over-driving distorts the panel and can crack the washer; under-driving leaves the seal incomplete.
How long do RAL-painted roofing screws last?
Painted Ruspert-coated roofing screws are typically warranted for 10-15 years against significant color fade and corrosion. In coastal or industrial environments, life will be shorter — bi-metal stainless screws are recommended for 25+ year service in those conditions.
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