Warm Deck Flat Roof Design

There are three recognised designs of flat roof construction.

Warm deck flat roof design.

This is as opposed to a cold roof in which the insulation is below or within the roof. This design dates back many years and flat roof insulation was somewhat of an afterthought with this type of roof. Where a cold flat roof does incorporate insulation this is in the form of mineral wool. On flat roofs a warm roof is one in which the insulation layer is laid on top of roof structure.

It is most important to note the vapour barrier must be a continuous vapour barrier with no puncture points. In the case of a flat roof insulation is usually in the form of either a rigid board above the deck or a fibrous quilt immediately above the ceiling depending on the type of roof construction. In the case of a flat roof insulation is usually either a rigid board above the deck or a mineral glass wool quilt immediately above the underdrawn ceiling depending on the type of roof design and construction. In this article we discuss the pros and cons of both roof designs.

This results in the structural deck and its supports being at a temperature closer to that of the building s interior. This is why warm flat roof designs are commonly regarded as the preferred and more effective design. The warm deck roof design is the modern method for flat roof construction and is preferred wherever this option is possible. Flat roof design guide.

So called because the insulating layer is located above the roof rafters and between the structural supports a warm deck roof results in a temperature for the roof and loft area that is consistent with the rest of the. Traditionally flat roofs simply consisted of a structural timber deck with a waterproof covering directly applied to the top of the deck. Warm flat roof designs.