Flat Roof Timber Frame Construction

Having a manual for warm flat roof construction with details and a summary of rules to follow helps.

Flat roof timber frame construction.

The basic construction of a flat roof starts with roofing timber that is laid across two upright items usually two walls. Sizes of joists needed for flat roof construction. Timber flat roof carports timber flat roof construction timber flat roof construction details timber flat roof deck timber flat roof detail timber flat. The flat roof shown above shows warm deck roof construction.

In this type of construction the insulation is placed below the waterproof covering and on top of the roof deck and vapour barrier. The definition of a flat roof according to bs 6229 is having a pitch less than 10 o to the horizontal however some in the industry would consider up to 15 o as their definition of a flat roof. When building a flat roof it is vital that a degree of falls is built into the construction to ensure rainwater run off. For additional stability you can also use steel joists that are built into one or both of the walls.

Old asbestos roofs are often replaced with flat roofs. So any timber joists that are used need to be strong enough to support this weight. The fall of the roof is achieved by using firring pieces with a fall of 1 in 40. As you may imagine there is a fair amount of weight involved here in terms of boards felt etc.

Others would treat even steeper pitches as flat roofs. The roof is a key element of the building structure providing protection from the elements and has a vital role in reducing heat loss from the building. Roofs tend to be either pitched or flat and typically in residential construction timber is the most common material used.