Flat roof drainage

The fall in a warm deck flat roof is usually catered for in one of three ways: screed laid to falls, tapered insulation roofing systems or by the use of timber firrings under a plywood deck. Certain considerations must be made when finding the ideal solution including cost, time and weight of the material.

We examined the cost analysis of the three standard options in a warm flat roof application across three different case studies of non-residential new builds, and discovered that using a tapered insulation system to achieve a U-value of 0.16 W/m²·K could be up to 26.9% cheaper than the alternative methods.

Download the white paper

Flat roof drainage: Roofing best practice for the 21st century

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