Flat Warm Roof Build Up

In terms of the thermal design of a flat roof what are the options and the best practices of flat roof build ups.

Flat warm roof build up.

The insulation boards in an inverted warm deck are laid over the structural deck and the waterproof covering. There are two types of flat roof. As the single ply roofing association spra points out this type of flat roofing is strong durable completely sealed and usually lasts at least 25 30 years. Pitched or sloping roof a pitched or slanted roof has a terrain of at least 15 but it is often much more.

Inverted warm deck roof. In creating the cold flat roof air is allowed to circulate freely between the joists and there is no insulation. The insulation is immediately below the waterproofing layer. A warm flat roof or a built up roof bur is one where all the insulation is above the joists deck making them part of the warm fabric of the building.

The sandwich warm deck roof is the most common type of flat roof. To use epdm for a warm deck flat roof construction solid closed cell roof insulation such as kingspan or celotex should be placed on top of the roof deck rather than in between the rafters. 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.

The vapour control layer is above the decking but below the insulation. Flat roofs are usually made of variations of bitumen felt and function as durable long lasting roofs that are perfect for water run off in wet weather and protect wood and cement from potential build ups of damp and dry rot. The recognised flat roof build ups for best design practices are. Cold roofs and warm roofs.

Warm deck flat roofs can be constructed on most modern construction material types such as concrete timber and timber based sheets. Warm cold and inverted. It is light easy to lay and because it is almost entirely liquid in it s original form is easy to get into otherwise inaccessible corners to ensure waterproof surfaces this flat roof covering can be roofing felt usually 3 layers with a mineral chipping topping to soak up the heat of. The insulation can be adhered mechanically fixed or loose laid.

As opposed to old built up felt roofing with joins new single ply waterproof membranes are now most commonly used.