Roof Insulation Uk Regulations

Care should be taken not to block any ventilation at the edges eaves.

Roof insulation uk regulations. Building regulations does not determine which material must be used but it stipulates what qualities it must posses. The limiting u value the maximise u value which cannot be exceeded required under current building regulations for the roof is 0 20w m. This is just under a third of a metre which may seem like quite a lot to you. 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. 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. 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. Walls are defined by regulation 2 3 of the building regulations 2010 as being thermal elements.

Heat rises and therefore the building regulations requirements for heat loss through roofs are more stringent than those for walls. No ventilation is required for these types of roofs. Insulation and thermal elements. The actual regulations require that loft insulation should be at least 270 mm thick and must have good thermal properties.

These are expressed as a u value which needs to be achieved. Building regulations for insulating a roof. 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. 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.

Building regulations standards set the levels of thermal insulation required when carrying out building work either for new build or refurbishment projects. Nhbc regulation 2011 insulation and control of condensation.