1. Setting the Base

Ensure purlins or steelwork are level and properly aligned.

Fix eaves fillers or closure strips to maintain weather-tightness.

2. Laying the First Panel

Start at the eaves, working towards the ridge and side laps.

Lay the first panel square to the eaves and ridge.

Fix through the crown of the outer skin into purlins using self-drilling fasteners with sealing washers.

3. Side Lap Sealing

Apply a continuous bead of butyl or mastic sealant in the side lap groove.

Overlap the next panel and press firmly for a tight seal.

Fix side laps using stitching screws at recommended intervals.

4. Fixing Pattern

Fixings should be placed:

At every purlin (typically 1.5m–2m centres)

At laps and mid-span, following manufacturer guidelines

Avoid over-tightening screws to prevent distortion or crushing the insulation.

5. Ridge & End Closures

Fit ridge flashings with suitable closures and sealant.

Seal and fix verge trims, barge boards, and other flashings as required.

Ensure continuity of vapour and weather seals.