Flat Roof Insulation Requirements Uk

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.

Flat roof insulation requirements uk.

This means that your approach to insulation will differ from a standard pitched roof. England new dwellings. Laying flat roof insulation as a rule any roof with a pitch below 10 is classified as a flat roof. 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.

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

It should be of the maximum available thickness. Cold roofs and warm roofs. U value of a flat roof. Our guides to building regulations in england adl1a 2013 building regulations.

There are two types of flat roof. 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. The saint gobain insulation uk product portfolio has a solution to help meet the requirements of the scheme. Ventilation is required for these roofs.

The typical u value of an existing uninsulated flat roof is 1 5w m2k. Find out more. In most cases there will not be a loft in a building that features flat roofing. Insulating between the joists of your loft will keep your house warmer but make the roof space above colder.

Cold roofs have the waterproof layer placed directly onto the roof deck and the insulation inside the roof just above the ceiling. In this case ventilation is required and the roof can still become wet with condensation which may cause materials to decay. Install a vapour control layer to reduce the risk of condensation and moisture compromising the flat roof structure. Room in the roof insulation.

To comply with part l of the building regulations 2010 all roofs to rooms except those in unheated buildings should be thermally insulated to a maximum u value of of 0 18 w m k. Lay 12mm of plywood or osb board across the timber joists as a base for the flat roof build up. Flat roof insulation thickness.