Installing cut-to-length and modular steel roof tiles: checks from delivery to handover

At delivery, check profile identification, coating, colour and ordered lengths. Photograph packaging and visible edge damage before work starts. Establish permitted storage conditions and the protective-film removal deadline; leaving a pack on site does not remove those requirements.

Plan support for long sheets and the lifting route before unloading. Do not slide sheets over each other. Modules are easier to distribute but still need protection from scratches and distortion. Handling damage can later prevent proper assembly despite accurate setting-out.

Start substrate inspection with diagonals, eaves straightness and plane alignment. Take batten spacing from the ordered profile’s instructions. A 350 mm module may apply to a particular product, but is not universal; the first batten and eaves detail need separate checking.

Before laying sheets, inspect the underlay, its joints and drainage. Confirm the required ventilation path and details at windows, chimneys and valleys. Concealed errors cost more to correct, so inspect these areas before covering them.

Align the first elements to the agreed eaves line and check their relative positions. Laying direction depends on the lap design. Do not compensate for an uneven substrate by stretching a sheet; forced alignment can impair joints and displace subsequent elements.

With modules, check successive rows before small deviations accumulate. For cut-to-length sheets, compare placement with the length schedule before final fastening. Clearly identifying each sheet’s location reduces errors, especially on roofs with many cuts.

Select fasteners for substrate and function: fixing to timber is not the same as stitching a lap. Documentation defines fixing positions and patterns with regard to design and roof zones. A single approximate screw count per metre cannot replace edge and central-zone requirements.

Drive screws square and inspect the seal rather than relying on tool resistance alone. Crushed or extruded washers indicate excessive compression; loose fixings also need correction. Recheck settings as material thickness or support hardness changes.

Use approved cold-cutting tools. Remove swarf after each stage, including from recesses and valleys. Treat minor damage with the recommended touch-up system; heat and sparks can damage protection beyond the cut edge itself.

At flashings, check water flow through successive layers: it must be directed outside, including during wind-driven rain. Chimneys and wall junctions deserve particular attention. Sealant cannot replace a correctly formed upstand or lap; it belongs within a complete detail.

Long sheets may reduce end laps on simple slopes, but require accurate dimensions and careful handling. Small modules offer different logistics on complex geometry. Do not judge waste by format alone; calculate the actual cutting layout with profile direction and required joints.

When ordering extra material, verify system, profile version and shade. A similar wave shape does not guarantee compatible interlocks. Different batches with the same colour code can look different, so resolve compatibility before placing them side by side.

Inspect sheet alignment, flashings, fixings, cleanliness and ventilation openings. Check for remaining film and debris in gutters. Arrange safe access to details; a view from the driveway cannot reveal every lap and seal.

Hand over product documents, stage photographs and inspection arrangements. Identify components needing maintenance access. This completes the checking sequence begun at measurement, confirming substrate, geometry and joints as well as appearance.