Flat Roof Insulation Requirements Uk

Insulation material is placed on top of the roof rather than in between the ceiling and the decking.

Flat roof insulation requirements uk.

This is best done when the roof covering needs replacing anyway. Lots of traditional flat roofs are of the cold roof construction type. Both these variants require different approaches to insulation which will be covered in this guide. Cold flat roof insulation.

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. Find out more. 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. In this case ventilation is required and the roof can still become wet with condensation which may cause materials to decay.

This means there is a vapour control layer in the ceiling and cross ventilation at the eaves or the top of the walls. Warm flat roof insulation. Ventilation is required for these roofs. A flat roof where the insulation sits below the waterproof membrane and above the structural deck is a warm roof deck.

A u value of 0 55 w m k is used for cavity insulation and 0 30 w m k for internal or external wall insulation. England new dwellings. Cold roofs have the waterproof layer placed directly onto the roof deck and the insulation inside the roof just above the ceiling. Our guides to building regulations in england adl1a 2013 building regulations.

There are two types of flat roof. Cold flat roofs are typically avoided as you d need to install ventilation which can prove problematic for many reasons relating to. A flat roof should preferably be insulated from above. A layer of rigid insulation board can be added either on top of the roof s weatherproof layer or directly on top of the timber roof surface with a new weatherproof layer on top of the insulation.

Insulation is placed in between the joists underneath the roof surface above. With a flat roof this issue does not arise but the u value constraint and the amount of insulation needed is just the same. Cold roofs and warm roofs. Insulation can also help to limit condensation and contribute to acoustic insulation depending on the type of insulation used.

The saint gobain insulation uk product portfolio has a solution to help meet the requirements of the scheme. Room in the roof insulation. This may help with condensation but causes such a loss of heat that it has been banned in scotland.