Flat Warm Roof Insulation

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.

Flat warm roof insulation.

The insulation for a warm roof will usually be boards of extruded polystyrene or rigid compressed boards of glass fibre or rock fibre. We recommend having at least 20 r value worth of material for optimal energy efficiency. If you live in a warm climate you require a lower r value. The vapour control layer is above the decking but below the insulation.

Increase your r value by layering insulation. Unfortunately too many dwellings suffer from this problem. While expensive the best insulation is polyiso rigid foam. They lose loads of heat and are prone to leaking causing the materials to deteriorate.

The recognised flat roof build ups for best design practices are. For a 1 inch board equivalent of 6 r value. 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.

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. With a warm roof the insulation is installed on top of the existing surface rather than in between the rafters. The insulation is immediately below the waterproofing layer. 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.

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. The format of house insulation you need depends on where you put it and if you need to control. Warm flat roofs do not need to be ventilated as the insulation is above the structure. A flat roof where the insulation sits below the waterproof membrane and above the structural deck is a warm roof deck.

Warm roofs offer a superior thermal performance and therefore come with a higher cost. A warm flat roof is defined by where the roof insulation is installed which is always above the roof deck. It is top quality and the most cost effective product for your flat roof. These are can be supplied with rebated edges which interlock reducing the risk of uplift.

You can expect to pay about 55 100 sq ft. Cold areas require a higher r value like an r 49. 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. 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.