Flat Roof Extension Building Regs

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.

Flat roof extension building regs.

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. Moreover the costs of a flat roof extension today are typically lower than for a pitched roof. Sizes of joists needed for flat roof construction. Old asbestos roofs are often replaced with flat roofs.

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 this usually consists of felting which has a slight fall to allow rain water to drain off. There must be a slope of 1 80. This is placed over the roof joists and an board normally external ply is laid on top.

Insulating flat roof extensions. A flat roof must be strong durable and stable throughout its lifetime. As you may imagine there is a fair amount of weight involved here in terms of boards felt etc. When installing or repairing a flat roof you must adhere to building regulations.

So any timber joists that are used need to be strong enough to support this weight. It must provide adequate protection against the elements keeping the buildings structure and interior dry. 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. U value of a flat roof.

Part h of the building regulations regarding drainage state that water should drain to one or two edges. A qualified roofing contractor will be able to advise on this but here are some of the main guidelines. Take inspiration from the ideas above to create an aesthetically pleasing extension for your unique home. Ventilation is required for these roofs.

Flat roof types. A lower u value indicates better insulation properties hence u value requirements usually specify a maximum value. To comply with part l of the building regulations flat roofs must achieve u values of 0 18 w m k or lower.