Flat Warm Roof Insulation

If you live in a warm climate you require a lower r value.

Flat warm roof insulation.

You can expect to pay about 55 100 sq ft. For a 1 inch board equivalent of 6 r value. 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 recognised flat roof build ups for best design practices are.

These are can be supplied with rebated edges which interlock reducing the risk of uplift. The great thing about a warm roof is that if your existing roof surface is in good condition you don t need to do much to it. The insulation is immediately below the waterproofing layer. 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. Warm flat roofs do not need to be ventilated as the insulation is above the structure. Warm deck flat roof insulation is now the standard way to insulate a flat roof click to enlarge. It is top quality and the most cost effective product for your flat roof.

A warm flat roof is defined by where the roof insulation is installed which is always above the roof deck. While expensive the best insulation is polyiso rigid foam. Cold flat roofs are typically avoided as you d need to install ventilation which can prove problematic for many reasons relating to space labour costs etc. They lose loads of heat and are prone to leaking causing the materials to deteriorate.

Flat roofs for example on extensions bathrooms and dormer windows are not the best of ideas. Warm roofs offer a superior thermal performance and therefore come with a higher cost. One of the main benefits you will receive from installing a warm flat roof is condensation will not become an issue because of the positioning of the insulation. Cold areas require a higher r value like an r 49.

With a warm roof the insulation is installed on top of the existing surface rather than in between the rafters. Unfortunately too many dwellings suffer from this problem. The insulation for a warm roof will usually be boards of extruded polystyrene or rigid compressed boards of glass fibre or rock fibre. As compared with a traditional flat roof installation this approach maintains a temperature within the roof area similar to that of the rest of the building interior.

Layer more insulation over the old for more effectiveness. The format of house insulation you need depends on where you put it and if you need to control. A flat roof where the insulation sits below the waterproof membrane and above the structural deck is a warm roof deck. While warm flat roof design has become more popular to help achieve ever stringent thermal performance modern roof structures are often required to also provide a level of sound insulation and fire protection.