Flat Roof Insulation Requirements Uk

Insulating a flat roof is relatively simple in terms of what materials you need and the steps taken to complete the job.

Flat roof insulation requirements uk. Insulating between the joists of your loft will keep your house warmer but make the roof space above colder. Flat roof insulation thickness. 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. Cold roofs have the waterproof layer placed directly onto the roof deck and the insulation inside the roof just above the ceiling.

The typical u value of an existing uninsulated flat roof is 1 5w m2k. 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 most cases there will not be a loft in a building that features flat roofing. The saint gobain insulation uk product portfolio has a solution to help meet the requirements of the scheme.

Hitting amazing levels of 0 13w m will need 300mm of mineral wool or 180mm of rigid foam. Install a vapour control layer to reduce the risk of condensation and moisture compromising the flat roof structure. Insulation can also help to limit condensation and contribute to acoustic insulation depending on the type of insulation used. U value of a flat roof.

Flat roof insulation always requires professional insulation and damp roofs require professional assessment before work can be carried out. Cold roofs and warm roofs. There are two types of flat roof. Our guides to building regulations in england adl1a 2013 building regulations.

In this case ventilation is required and the roof can still become wet with condensation which may cause materials to decay. Laying flat roof insulation as a rule any roof with a pitch below 10 is classified as a flat roof. Ventilation is required for these roofs. It should be of the maximum available thickness.

This means that your approach to insulation will differ from a standard pitched roof. Find out more. Pipes water tank and loft hatch. England new dwellings.

Room in the roof insulation. Lay 12mm of plywood or osb board across the timber joists as a base for the flat roof build up. 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.