Warm Flat Roof Insulation

A note to consider before construction.

Warm flat roof insulation.

Warm deck flat roof insulation is now the standard way to insulate a flat roof click to enlarge. The vapour control layer is above the decking but below the insulation. Flat roofs for example on extensions bathrooms and dormer windows are not the best of ideas. With a warm roof the insulation is installed on top of the existing surface rather than in between the rafters.

In a warm roof construction the principal insulation layer is placed above the structural decking resulting in the structural deck and support structure being at a temperature similar to that of the building interior. Insulation in a warm roof the insulation for a warm roof will usually be boards of extruded polystyrene or rigid compressed boards of glass fibre or rock fibre. While expensive the best insulation is polyiso rigid foam. Unfortunately too many dwellings suffer from this problem.

Saint gobain insulation uk manufacture and supply glass mineral wool slabs and rolls along with rigid polyisocyanurate pir boards that can be considered suitable for a wide range of applications across flat roofs whether you re looking to insulate at joist level or above the roof deck in your flat roof construction. For a 1 inch board equivalent of 6 r value. From there the flat roof system you choose will determine the materials you apply. You can expect to pay about 55 100 sq ft.

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. It is top quality and the most cost effective product for your flat roof. The insulation is immediately below the waterproofing layer. We recommend having at least 20 r value worth of material for optimal energy efficiency.

They lose loads of heat and are prone to leaking causing the materials to deteriorate. At least 100mm of rigid board insulation must be positioned on top of the vapour control layer the vapour control layer stops any moisture within the building contaminating the insulation. Warm roofs offer a superior thermal performance and therefore come with a higher cost. The insulation material for a warm flat roof should.

Flat roof u value 0 18 w m2k 2 warm deck flat roof the type of insulation for this is usually of a rigid type and the thickness will vary depending on the manufacturer s specifications. 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 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.