Flat Roof Insulation Depth

Cold roofs and warm roofs.

Flat roof insulation depth.

Cold roofs have the waterproof layer placed directly onto the roof deck and the insulation inside the roof just above the ceiling. In this case ventilation is required and the roof can still become wet with condensation which may cause materials to decay. The typical u value of an existing uninsulated flat roof is 1 5w m2k. 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.

To achieve this add 100 to 160mm of insulation above the structural deck dependant upon insulant conductivity. 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. 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. Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation.

Owens corning insulation products help improve thermal performance and control moisture in commercial institutional and. A lower u value indicates better insulation properties hence u value requirements usually specify a maximum value. The flat roof overhead is framed in full depth 2x6s finished with what jordan believes is roll roofing a type of asphalt roofing. The effective roof insulation layer may range in thickness from 3 to 12 cm as needed.

The importance of insulation thickness r value isn t just a time measurement though. The target should be to achieve a u value of 0 25w m2k or better. Such an insulating solution involves applying several layers of pur foam with each layer around 1 2 cm thick. There are many different types and installation methods out there along with a lot misinformation about which products offer the greatest energy savings.

It takes into account the size of the sample and the overall change of temperature over time so that you can compare thermal conductivity of materials tested with plates of different temperatures or even that were tested by other methods. There are two types of flat roof. Find your zone on the map and then use the chart to determine the level of insulation you need to properly insulate your attic walls floors and crawlspaces. Closed cell polyurethane spray foam will prove ideal for thermal insulation of a flat roof.

Roofing insulation is one of the most important and misunderstood building components. With a flat roof this issue does not arise but the u value constraint and the amount of insulation needed is just the same.