Warm Deck Flat Roof Insulation

The best method of insulating a flat roof is by using a warm deck flat roof construction method.

Warm deck flat roof insulation.

So called because the insulating layer is located above the roof rafters and between the structural supports a warm deck roof results in a temperature for the roof and loft area that is consistent with the rest of the. Flat roof insulation. The solution warm deck insulation. 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.

A flat roof where the insulation sits below the waterproof membrane and above the structural deck is a warm roof deck. We have a wide range of roof insulation products including flat roof insulation tapered insulation and pitched roof loft insulation. We also have insulation boards suitable for more specialist roof applications for example inverted roof insulation and balcony insulation. The layer of insulation is essentially placed outside of the roof.

Fortunately these days there is a better form of insulation available for your flat roof. The recognised flat roof build ups for best design practices are. This is placed over the roof joists and a board normally external ply is laid on top. The warm deck roof design is the modern method for flat roof construction and is preferred wherever this option is possible.

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. This system is called warm deck insulation and eradicates the condensation and venting issues associated with the cold deck system. 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. This means that the insulation should be highly resistant to water absorption for example an extruded polystyrene based product which will not be affected by water or repeated freeze thaw cycles.

The main advantage of a warm deck construction versus a cold deck construction is that there is no need to include a ventilated cavity in the warm deck construction. Inverted roofs are a type of warm flat roof where the insulation is above the waterproofing layer. It also provides better thermal performance and makes it easier to eliminate thermal bridging. Warm flat roofs do not need to be ventilated as the insulation is.

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. Good question theoretically when building a warm roof the vaper control layer goes on the warm side of the insulation.