Warm Pitched Roof Insulation Thickness

There is a requirement when refurbishing a roof to have a minimum u value of 0 18 w m k in england and wales but for a complete re roof in wales the minimum u value required is 0 15 w m k.

Warm pitched roof insulation thickness.

Kingspan with a warm roof the usual process is to split the insulation into two layers. Cold deck roof a cold deck roof is where the insulation is placed between the joists rafters or in between the ceiling joists in the case of a pitch roof. The below table shows the thickness of insulation required for a typical warm roof construction with insulation fitted above the rafters. Level for a cold pitched roof or at rafter level if a living area within a warm roof construction is desired.

The battening and tiling is then fixed down over. Cold deck the insulation can be placed between the rafters or it can be placed between the ceiling joists. The thickness of insulation will vary depending on the manufacturer s specification. Our u value calculator is free and simple to use for calculating u values specific to your roof construction design.

Introduction warm cold roofs this guidance offers guidance on the difference benefits between warm and cold roofs. Warm deck the insulation is placed over the rafters and then a felt is placed on top. Ventilation is required for these roofs. The roof insulation thickness will vary dependent on the required u value.

There will also be kooltherm k7 pitched roof board between the rafters image credit.