Are fixings supplied with galvanised roofing sheets?

Whether fixings are supplied with galvanised roofing sheets depends on whether the order is for sheets only or for a specified roofing package. A sheet-only quotation normally covers the profiled sheets and any agreed cutting, while a building kit or complete roof specification can include the fasteners and ancillary components needed for installation.

For a typical steel-framed building, the fixing schedule may include:

• Primary sheet fixings: roofing screws selected for the supporting material, such as steel purlins or timber.
• Sealing washers: usually used beneath the screw head to help seal the fixing point through the sheet.
• Side-lap stitching screws: used where adjacent sheets overlap, where the roof design requires them.
• Associated roofing components: items such as profile-matched fillers, closures or flashings may be listed separately from the fasteners.

The correct fixing specification is not determined by the galvanised coating alone. It also depends on the sheet profile and thickness, the supporting structure, the fixing zone, exposure conditions and the roof layout. Screws must be long enough to achieve the required engagement in the purlin or other substrate without damaging the sheet or compressing the washer excessively. The washer and screw finish should also be compatible with the roofing material to reduce the risk of premature corrosion.

Fixing positions and quantities should follow the sheet manufacturer’s installation guidance and the building’s design requirements. Over-tightening can distort the profile or damage the sealing washer, while insufficient tightening may allow water to track through the fixing point. Side laps should be formed in the direction specified for the roof, with stitching fixings used where required rather than relying only on the main purlin fixings.

When requesting a quotation, provide the roof dimensions, sheet profile, support type and any information about roof pitch or exposure. Ask for the quotation to distinguish clearly between the galvanised sheets, main fixings, side-lap fixings, washers and any closures or flashings. This makes it clear which items are included and avoids treating general-purpose screws as suitable substitutes for a specified roofing fixing system.

For a bespoke building package, Buildings UK Ltd can identify the relevant roofing components as part of the design and specification process. The quotation should still be checked against the intended installation method, particularly if the sheets are being purchased as a kit and erected separately.