Flat roofing: every layer has a job.

The deck comes first

The substrate supports the roof system. Its condition and suitability need to be understood before a new covering or an overlay is considered.

Insulation and moisture

Insulation should be selected as part of a complete design. Vapour control, condensation risk and interfaces with the waterproofing system need attention.

The waterproofing line

A membrane or liquid-applied system must suit the substrate and roof use. Seams, penetrations, upstands and perimeter details deserve as much thought as the main roof area.

Give water a route

A flat roof still needs a drainage strategy. Falls and outlets work together; tapered insulation can be one way to form the required geometry where appropriate.