Flat Roof Extension Building Regs

When installing or repairing a flat roof you must adhere to building regulations.

Flat roof extension building regs.

As you may imagine there is a fair amount of weight involved here in terms of boards felt etc. This is placed over the roof joists and an board normally external ply is laid on top. So any timber joists that are used need to be strong enough to support this weight. 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.

U value of a flat roof. Sizes of joists needed for flat roof construction. It must provide adequate protection against the elements keeping the buildings structure and interior dry. A qualified roofing contractor will be able to advise on this but here are some of the main guidelines.

A roof is defined in bs 6229 as a flat roof if it has a pitch of 10 degrees or less. Old asbestos roofs are often replaced with flat roofs. There must be a slope of 1 80. Insulating flat roof extensions.

The flat roof extension is more on trend than it once was and is free of the dreaded leaks that haunted this type of structure in the past. Part h of the building regulations regarding drainage state that water should drain to one or two edges. Ventilation is required for these roofs. Take inspiration from the ideas above to create an aesthetically pleasing extension for your unique home.

Moreover the costs of a flat roof extension today are typically lower than for a pitched roof. 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. Flat roof this usually consists of felting which has a slight fall to allow rain water to drain off. A flat roof must be strong durable and stable throughout its lifetime.

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. Flat roof types. To comply with part l of the building regulations flat roofs must achieve u values of 0 18 w m k or lower.