BPA galvanised flat steel, matt polyester — RAL 7016 8017 9005 — 2-metre sheet lengths

An unusual sill, broad parapet or roof-to-wall junction often needs its own flashing section. Flat sheet can be cut and folded to match the actual building, giving a component that protects the joint and finishes it neatly.

Flat sheet has no predetermined profile. Folds, drip edges and laps can be positioned to suit the actual measurements, particularly useful on renovations where wall or roof-edge dimensions are not standard. One material can form a straight, corner or multi-step flashing. Bending a single piece to cover more of the joint avoids multiple small infills. It gives a cleaner appearance next to surrounding surfaces. A hem can also conceal the cut edge, giving thin sheet a tidy finish even at close range.

A fall and a correctly shaped end take water clear of the protected edge. A window sill throws water clear of the façade; at an eave, a flashing directs it into the planned drainage zone. The protection depends on the whole shape, including laps and fixings. A well-formed flashing finishes the adjoining building layers neatly and lets them work as intended in the rain.

Coated flat sheet has its final colour before it is formed. Match it to tile-effect roof sheets, wall panels or joinery for a consistent appearance across sills, corners and covers. A deliberately contrasting colour can also highlight a particular feature. Choose a finish that suits both the forming operation and service exposure so the coating retains its protective role. Matching matt or gloss levels helps a façade look coherent, especially around windows set in one row.

Flat sheet forms edge covers, cover strips, finishing bands and bespoke parts, which is useful when a renovation affects several parts of a house or industrial building. Adding wall insulation may call for a wider sill; replacing the roofing may call for a new chimney flashing. The same sheet can serve both with a matching finish. Thin material allows crisp lines and modest projections, even at narrow, visible details.

SteelProfil supplies first- and second-grade flat sheets for a range of uses, with selected sizes in stock. Promotional lots and competitive prices can help when buying material for your own flashings. Compare the sheet sizes and finishes with the dimensions and colours of the building.