Warm Roof Insulation Depth

Warm flat roofs do not need to be ventilated as the insulation is.

Warm roof insulation depth.

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. 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. A warm roof has the insulation above the structural deck which is thus kept warm. The below table shows the thickness of insulation required for a typical warm roof construction with insulation fitted above the rafters.

12 5mm plasterboard 22mm batters 150mm concrete deck insulation 6mm felt weather cover. 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 cold roof can be cheaper as ridged warm roof insulation tends to be more expensive a warm roof is sometimes the only option when it is difficult to get the required cross ventilation rigid. For guidance on roof insulation please contact us on 44 01257 488 000.

Ventilation is required for these roofs. With a warm roof the usual process is to split the insulation into two layers. This warm roof design was conceived through the use of a pod system patent granted finished off externally with lightweight tiles which are available in a wide range of colours to match your home. The waterproof layer is above the insulation and a vapour control layer is placed below the insulation.

In practice the depth of insulation that can be added is often determined by features such as flashings kerbs and upstands. If 180mm is to be installed then 100mm board might be introduced between the rafters there has to be a minimum 25mm air gap between the insulation and the underside of the tiles or slates with an 80mm board running across the rafters. Find warm flat roof cold flat roof insulation solutions at iko polymeric. The recommended depth of blanket style insulation glass or mineral wool for a loft is 250 to 270 mm.

Our u value calculator is free and simple to use for calculating u values specific to your roof construction design. A flat roof where the insulation sits below the waterproof membrane and above the structural deck is a warm roof deck. If you already have insulation but it was put in some time ago it is worth checking the.