Warm Deck Roof Insulation Thickness

Warm deck insulation 1.

Warm deck roof insulation thickness.

The insulation is immediately below the waterproofing layer. Set the quinn therm qrfr ply insulation boards onto a wide 30mm bead of vapour resistant sealant applied to the upper surface of all the joists and cross noggins. A warm roof has the insulation above the structural deck which is thus kept warm. Ventilation is required for these roofs.

Warm flat roofs do not need to be ventilated as the insulation is. The waterproof layer is above the insulation and a vapour control layer is placed below the insulation. The insulation can be adhered mechanically fixed or loose laid. 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.

The joist size depends on your span but assuming you are going out say 3m or so your joists would be about 150 deep. Cold deck this is where the insulation is placed between the joists rafters or in between the ceiling joists in the case of a pitch roof. Warm deck roof a warm deck roof is where the insulation is placed on top of the rafters joists and the roof covering is then placed over the insulation. Cold deck roof a cold deck roof is where the insulation is placed between the joists rafters or in.

Min 125 thickness of insulation board then finish on top. They lose loads of heat and are prone to leaking causing the materials to deteriorate. No ventilation is required for these types of roofs. There are two basic categories of roof design.

How to install insulation in a flat roof with timber deck insulated above the joists. Warm deck flat roof insulation is now the standard way to insulate a flat roof click to enlarge flat roofs for example on extensions bathrooms and dormer windows are not the best of ideas. 18 thickness of deck. Add to this the firring pieces for slope say 75 max.

Warm deck the type of insulation for this is usually of a rigid type and the thickness will vary depending on the manufacturer s specifications. A flat roof where the insulation sits below the waterproof membrane and above the structural deck is a warm roof deck.