Warm Deck Roof Insulation Thickness

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.

Warm deck roof insulation thickness.

Min 125 thickness of insulation board then finish on top. The battening and tiling is then fixed down over. 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.

Pitch roof u value 0 16 w m2k 2 warm deck pitched roof the insulation is placed over the rafters and then a felt is placed on top. 18 thickness of deck. The joist size depends on your span but assuming you are going out say 3m or so your joists would be about 150 deep. How to install insulation in a flat roof with timber deck insulated above the joists.

The vapour control layer is above the decking but below the insulation. The battening and tiling is then fixed down over. The insulation may be fully or partially bonded to the vapour control layer or laid loose. 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.

There are two basic categories of roof design. A warm roof has the insulation above the structural deck which is thus kept warm. The thickness of insulation will vary depending on the manufacturer s specification. Warm deck the insulation is placed over the rafters and then a felt is placed on top.

Warm flat roofs do not need to be ventilated as the insulation is. Cold deck the insulation can be placed between the rafters or it can be placed between the ceiling joists. Warm deck insulation 1. Of the insulation and tacked to the joists before applying the plasterboard.

The waterproof layer is above the insulation and a vapour control layer is placed below the insulation. The insulation is immediately below the waterproofing layer. The insulation can be adhered mechanically fixed or loose laid. 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.

Composite board can be found on both warm and inverted roof applications. These often have a deck of plywood with a cellular insulation and metal foil vapour control layer bonded to the underside and a top layer with an overlay factory bonded to it. The warm deck roof design is the modern method for flat roof construction and is preferred wherever this option is possible.