Warmdeck Roofs

In warm-deck roof construction the thermal insulation is laid between the roof deck and the weatherproof covering (Fig. 6.1). This ensures that the roof deck and its supporting structure are insulated from extremes of temperature, thus limiting excessive thermal movement which may cause damage. As the insulating material is directly under the waterproof layer, it must be sufficiently strong to support any foot traffic associated with maintenance of the roof. The waterproof and insulation layers will require mechanical fixing or ballasting to prevent detachment in strong winds. Surface condensation on the underside of a roof deck within warm-deck roof construction would normally indicate insufficient thermal insulation. Warm-deck construction is the preferred method for lightweight roofs.

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