Flat Roof Insulation Depth

Achieving a u value of 0 20w m meaning your roof will be better insulated than your walls will need 120mm thickness of rigid foam or 200mm of mineral wool or natural insulation.

Flat roof insulation depth.

Foamular xps roof insulation for commercial buildings page 5 foamular xps roof insulation for commercial buildings foamular xps insulation is a rigid foam insulation which meets the needs of today s design professionals for a truly sustainable insulation product. There are two types of flat roof. A lower u value indicates better insulation properties hence u value requirements usually specify a maximum value. To achieve this add 100 to 160mm of insulation above the structural deck dependant upon insulant conductivity.

Cold roofs have the waterproof layer placed directly onto the roof deck and the insulation inside the roof just above the ceiling. It should be of the maximum available thickness. The importance of insulation thickness r value isn t just a time measurement though. Roofing insulation is one of the most important and misunderstood building components.

Cold roofs and warm roofs. In this case ventilation is required and the roof can still become wet with condensation which may cause materials to decay. U value of a flat roof to comply with part l of the building regulations 2010 all roofs to rooms except those in unheated buildings should be thermally insulated to a maximum u value of of 0 18 w m k. The flat roof overhead is framed in full depth 2x6s finished with what jordan believes is roll roofing a type of asphalt roofing.

There are many different types and installation methods out there along with a lot misinformation about which products offer the greatest energy savings. With a flat roof this issue does not arise but the u value constraint and the amount of insulation needed is just the same. The typical u value of an existing uninsulated flat roof is 1 5w m2k. Owens corning insulation products help improve thermal performance and control moisture in commercial institutional and.

The effective roof insulation layer may range in thickness from 3 to 12 cm as needed. Such an insulating solution involves applying several layers of pur foam with each layer around 1 2 cm thick. Here we share the most common mistakes people make when installing flat roofing insulation. My issue is how to correctly insulate the ceiling he writes in a q a post.

Closed cell polyurethane spray foam will prove ideal for thermal insulation of a flat roof. The target should be to achieve a u value of 0 25w m2k or better.