Which roofing screw do I need near the coast?

Within about 5 km of the coast, specify Class 4 coated fixings or a stainless 304 head with a carbon drill point. Directly on the shoreline, use stainless 316. Class 3 fixings will show head corrosion within a few seasons in salt air.

How many roofing screws per square metre?

It depends on the sheet profile and purlin spacing, but a common IBR or corrugated roof runs roughly 6–8 fixings per square metre including side laps. Send us the profile and purlin centres and we return the quantity with the quote.

Why does the sealing washer matter so much?

The EPDM washer, not the screw, is what keeps the roof watertight. Bonded EPDM stays elastic through thermal cycling and high UV; cheaper neoprene hardens, shrinks and leaks at the shank, usually within two or three seasons of African sun.

Can heads be painted to match our roof sheeting colour?

Yes. Heads are powder-coated to standard sheeting colour ranges or to a code you supply. Minimum quantities apply per colour as heads are painted in batches.

Bulk supply · Africa

Roofing Fasteners

Roof and cladding fixings with bonded EPDM sealing washers, Class 3 and Class 4 coatings and colour-matched heads, supplied in bulk for African coastal, high-UV and industrial exposure.

EPDM SEALING WASHERS
CLASS 3 / CLASS 4 COATINGS
COLOUR-MATCHED HEADS

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Also searched as: roof screws · cladding fixings · tek screws with washer · IBR screws

Roofing screws with hex heads, bonded black EPDM sealing washers and colour-matched heads beside a corrugated roof sheet

What buyers need to know

Specifying roofing fasteners.

A roof fails at its fixings long before the sheet gives up. In African conditions the two killers are UV degradation of the sealing washer and coastal corrosion of the head. Both are specification decisions made at purchase, not installation problems, and both are why we quote roofing fixings by exposure zone rather than by price alone.

The sealing washer should be bonded EPDM, not loose neoprene. Bonded EPDM stays elastic through years of thermal cycling and holds compression as the sheet expands and contracts; cheap alternatives harden, shrink and let water track down the shank within two or three seasons. The head must be driven to compress the washer visibly but not crush it — worth putting in the installer brief.

For side laps and flashings, stitching screws and rivets close the joint without over-penetrating. For fibre cement and timber purlins the thread and point change again. Send the sheet profile, purlin material and thickness, and the distance from the coast, and we will return a complete fixing schedule with quantities per square metre.

Specification

Full specification table.

Roofing Fasteners specification
Types	Self-drilling roof screws, timber-thread roof screws, stitching screws, hook bolts
Sealing	Bonded EPDM washer, 16 mm and 19 mm; galvanised or stainless cap
Coatings	Class 3, Class 4, Dacromet, stainless 304 head with carbon point
Drives	Hex washer head 8 mm and 5/16" — driven, not screwdriven
Sizes	12-14 x 50 mm, 12-14 x 65 mm, 14-10 x 75 mm and full range
Colour heads	Powder-coated to standard African roof sheeting colour ranges
Accessories	Closures, flashing tape, hook bolts, purlin fixings
Packing	Boxes of 100 and 250, bulk cartons and pallet quantities

Types we stock and source

Variants on one enquiry.

Self-drilling roof screws

Steel purlin fixing with bonded EPDM washer.

Timber-thread roof screws

Coarse thread for timber purlins and battens.

Stitching screws

Short fine-thread screws closing sheet side laps.

Hook bolts

Fixing sheeting to angle and tubular purlins.

Colour-matched screws

Painted heads matched to the sheeting colour.

Sealing washers

Replacement 16 mm and 19 mm bonded EPDM washers.

Coating by exposure

Which finish for which African site.

Inland, low corrosion: Class 3 coated carbon steel, 16 mm EPDM washer.
Within 5 km of the coast: Class 4 or stainless 304 head with carbon drill point.
Direct marine or sulphurous: Full stainless 316 fixings; budget for it upfront.
High UV inland Africa: Bonded EPDM only — neoprene hardens and leaks early.

Full coating selection guide →

Typical order sizes

What a real enquiry looks like.

80,000 Class 3 roof screws for an industrial park re-roof
Colour-matched screws in three colours for a residential estate contract
Class 4 fixing package for a coastal warehouse within 2 km of the shore

Questions

Roofing fasteners FAQs.

Which roofing screw do I need near the coast?: Within about 5 km of the coast, specify Class 4 coated fixings or a stainless 304 head with a carbon drill point. Directly on the shoreline, use stainless 316. Class 3 fixings will show head corrosion within a few seasons in salt air.
How many roofing screws per square metre?: It depends on the sheet profile and purlin spacing, but a common IBR or corrugated roof runs roughly 6–8 fixings per square metre including side laps. Send us the profile and purlin centres and we return the quantity with the quote.
Why does the sealing washer matter so much?: The EPDM washer, not the screw, is what keeps the roof watertight. Bonded EPDM stays elastic through thermal cycling and high UV; cheaper neoprene hardens, shrinks and leaks at the shank, usually within two or three seasons of African sun.
Can heads be painted to match our roof sheeting colour?: Yes. Heads are powder-coated to standard sheeting colour ranges or to a code you supply. Minimum quantities apply per colour as heads are painted in batches.

Where we ship it

Roofing Fasteners by country.

Usually ordered together.

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