Warm Deck Roof Insulation Thickness

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 insulation thickness.

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. 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. No ventilation is required for these types of roofs.

The vapour control layer is above the decking but below the insulation. A warm roof has the insulation above the structural deck which is thus kept warm. Min 125 thickness of insulation board then finish on top. The insulation can be adhered mechanically fixed or loose laid.

The waterproof layer is above the insulation and a vapour control layer is placed below the insulation. There are two basic categories of roof design. 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. How to install insulation in a flat roof with timber deck insulated above the joists.

The insulation is immediately below the waterproofing layer. Ventilation is required for these roofs. Warm deck insulation 1. Warm flat roofs do not need to be ventilated as the insulation is.

A flat roof where the insulation sits below the waterproof membrane and above the structural deck is a warm roof deck. They lose loads of heat and are prone to leaking causing the materials to deteriorate. 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. Add to this the firring pieces for slope say 75 max.

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. Cold deck roof a cold deck roof is where the insulation is placed between the joists rafters or in.