Flat Roof Insulation Regulations

Tapered flat roof insulation a flat roof should always allow for water channelling and drainage to prevent issues such as ponding.

Flat roof insulation regulations.

In bs 6229 a roof is defined as flat if it has an overall pitch of 10 degrees or less. 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. There are two types of flat roof.

It is top quality and the most cost effective product for your flat roof. Cold roofs have the waterproof layer placed directly onto the roof deck and the insulation inside the roof just above the ceiling. The limiting u value the maximise u value which cannot be exceeded required under current building regulations for the roof is 0 20w m. It must provide adequate protection against the elements keeping the buildings structure and interior dry.

A lower u value indicates better insulation properties hence u value requirements usually specify a maximum value. You can expect to pay about 55 100 sq ft. How to insulate a 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.

We recommend having at least 20 r value worth of material for optimal energy efficiency. No ventilation is required for these types of roofs. This means that your approach to insulation will differ from a standard pitched roof. The roof thermal insulation would normally have to be improved.

Building regulations for insulating a roof heat rises and therefore the building regulations requirements for heat loss through roofs are more stringent than those for walls. While expensive the best insulation is polyiso rigid foam. The removal or alteration to any roof elements could. A roof is defined in bs 6229 as a flat roof if it has a pitch of 10 degrees or less.

U value of a flat roof 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. For a 1 inch board equivalent of 6 r value. If you want to carry out repairs on or re cover less than 25 per cent of the area of a pitch or flat roof you will not normally need to submit a building regulations application. A flat roof must be strong durable and stable throughout its lifetime.

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. Cold roofs and warm roofs.