Which flat roof systems are used on commercial buildings?
Most flat commercial roofs in the UK use one of a handful of systems. Single-ply membranes, such as EPDM and PVC types, are sheets fixed or bonded to the deck, with welded or sealed seams. Built-up felt is an older, layered approach, still found on many buildings. GRP (fibreglass) is common on smaller roofs, and liquid-applied coatings can extend the life of a roof that is still sound.
The right choice depends on the deck, the shape of the roof, how water drains off it, how much foot traffic it gets and the budget. Flat roofs should never rely on standing water staying put, so falls and outlets matter as much as the covering.
We explain the options in writing so that you can compare them.

