Flat Roof Extension Building Regs

Insulating flat roof extensions.

Flat roof extension building regs. The steels or rsj s rolled steel joists are often built into one or both walls to give added stability to the roof structure. To enable compliance with the requirements of the building regulations to be demonstrated full details of the new roof will be needed including materials and their dimensions and performance properties. Heat rises and therefore the building regulations requirements for heat loss through roofs are more stringent than those for walls. Thickness varies according to the manufacturer s specifications.

The limiting u value the maximise u value which cannot be exceeded required under current building regulations for the roof is 0 20w m. Part h of the building regulations regarding drainage state that water should drain to one or two edges. There must be a slope of 1 80. Flat 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 flat roof must be strong durable and stable throughout its lifetime. Flat roof this usually consists of felting which has a slight fall to allow rain water to drain off. A roof is defined in bs 6229 as a flat roof if it has a pitch of 10 degrees or less. It must provide adequate protection against the elements keeping the buildings structure and interior dry.

Below from the dwelling and has not less than three quarters of its roof area and one half its exposed wall area made from. On a basic level flat roof construction comes in the form of roofing timbers or joists as they are more commonly known or steels that are laid across two uprights walls in most cases. A qualified roofing contractor will be able to advise on this but here are some of the main guidelines. This usually consists of felting which has a slight fall to allow rain water to drain off to enable compliance with the requirements of the building regulations to be demonstrated full details of the new roof will be needed including materials and their dimensions and performance properties.

A lower u value indicates better insulation properties hence u value requirements usually specify a maximum value. U value of a flat roof. Flat roof 0 18 extensions to form conservatories the accepted definition of conservatory for building control purposes in hertfordshire is a ground level extension that is thermally separated see a. When installing or repairing a flat roof you must adhere to building regulations.

Traditionally flat roofs were constructed with cold decks where the spaces between the joists were packed with mineral wool type insulation placed above the ceiling like a conventional loft. Building regulations for insulating a roof.