Roof Insulation Uk Regulations

If you are installing loft insulation as part of a roof renovation project where more than 25 per cent of the roof is being renewed then the level of insulation should meet the standards required by building regulations approved documents.

Roof insulation uk regulations.

Building regulations does not determine which material must be used but it stipulates what qualities it must posses. 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. A qualified roofing contractor will be able to advise on this but here are some of the main guidelines. There must be a slope of 1 80 part h of the building regulations regarding drainage state that water should drain to one or two edges waterproofing should extend up the adjacent walls at least.

Heat rises and therefore the building regulations requirements for heat loss through roofs are more stringent than those for walls. Warm deck this is where the insulation is placed on top of the rafters joists and the roof covering is then placed over the insulation. These are expressed as a u value which needs to be achieved. This is just under a third of a metre which may seem like quite a lot to you.

Building regulations standards set the levels of thermal insulation required when carrying out building work either for new build or refurbishment projects. 7 2 d11 a ventilation of main roof spaces pitched roofs with insulation at ceiling level should always be ventilated to the outside air to minimise the risk of ventilation. Care should be taken not to block any ventilation at the edges eaves. The required u value will depend on the location of the project england scotland or wales type of building domestic or non domestic and the application floor wall or roof.

Building regulations for insulating a roof. Making significant changes to thermal elements walls roofs or floors would normally require building regulations approval and require the thermal insulation of the element to be upgraded to a reasonable standard. Insulation and thermal elements. No ventilation is required for these types of roofs.

The limiting u value the maximise u value which cannot be exceeded required under current building regulations for the roof is 0 20w m. Nhbc regulation 2011 insulation and control of condensation.