Flat Roof Insulation Requirements Uk

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.

Flat roof insulation requirements uk.

U value of a flat roof. Find out more. The typical u value of an existing uninsulated flat roof is 1 5w m2k. The saint gobain insulation uk product portfolio has a solution to help meet the requirements of the scheme.

Insulation can also help to limit condensation and contribute to acoustic insulation depending on the type of insulation used. Achieving a u value of 0 20w m meaning your roof will be better insulated than your walls will need 120mm thickness of rigid foam or 200mm of mineral wool or natural insulation. In this case ventilation is required and the roof can still become wet with condensation which may cause materials to decay. Ventilation is required for these roofs.

Cold roofs have the waterproof layer placed directly onto the roof deck and the insulation inside the roof just above the ceiling. There are two types of flat roof. Our guides to building regulations in england adl1a 2013 building regulations. In most cases there will not be a loft in a building that features flat roofing.

Pipes water tank and loft hatch. This means that your approach to insulation will differ from a standard pitched roof. Insulating a flat roof is relatively simple in terms of what materials you need and the steps taken to complete the job. Install a vapour control layer to reduce the risk of condensation and moisture compromising the flat roof structure.

Hitting amazing levels of 0 13w m will need 300mm of mineral wool or 180mm of rigid foam. Flat roof insulation thickness. Cold roofs and warm roofs. Lay 12mm of plywood or osb board across the timber joists as a base for the flat roof build up.

It should be of the maximum available 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. Laying flat roof insulation as a rule any roof with a pitch below 10 is classified as a flat roof. England new dwellings.

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. Flat roof insulation always requires professional insulation and damp roofs require professional assessment before work can be carried out. The chosen insulation laid on top of this should be able to take the weight of anything put above it on the roof without compression or protected from compression by further sheeting.