Made-to-length tile-effect sheets can suit a simple roof slope where the layout produces few offcuts. Ask for a cutting plan for the entire roof, including valleys and dormers, before settling on a sheet length. Consider the route from the delivery vehicle to the roof. Where access for lifting is restricted, shorter sheets can be easier to handle even with the extra lap. To work out the quantity required, use the effective cover width and the lengths permitted for the particular profile.

Choosing cut standing-seam cladding for a traditional-style house requires assessing the whole roof slope, not a single piece of sheet. Check whether the rhythm of the waves and pressings harmonises with the building’s scale, window layout, chimney and eaves width. Compare the colour with existing façade materials, keeping the number of tones restrained. Sheet length is also a practical criterion: on simple slopes it can reduce cross-joints, but with dormers and valleys compare the cut format with the modular one. Before ordering, measure the roof and assess the condition of the roof structure.

Begin by establishing which coating covers the metal roof tiles and what condition it is in, since this determines the permissible cleaning method. Check whether the green deposit is moss, algae or another biological growth, and where it concentrates — in depressions, around flashings or in shade, where the roof slope dries more slowly. Inspect the water drainage and remove loose leaves and twigs before washing. When choosing a method and product, follow the coating instructions; leave design decisions to the designer.