Flat Roof Timber Frame Construction

Old asbestos roofs are often replaced with flat roofs.

Flat roof timber frame construction.

The ceiling joists are used as the platform for the roof coverings. When installing or repairing a flat roof you must adhere to building regulations. Roofs tend to be either pitched or flat and typically in residential construction timber is the most common material used. These things will affect the timing cost and overall running of your project.

The flat roof shown above shows warm deck roof construction. As you may imagine there is a fair amount of weight involved here in terms of boards felt etc. Where a new flat roof abuts an existing external wall the joists can be hung on metal joist hangers which are fixed to a horizontal timber plate wall bolted to the wall. Having a manual for warm flat roof construction with details and a summary of rules to follow helps.

Sizes of joists needed for flat roof construction. A cavity closer should be provided to the top of the walls to prevent fire spread and to stop damp air entering the roof space. The fall of the roof is achieved by using firring pieces with a fall of 1 in 40. So any timber joists that are used need to be strong enough to support this weight.

For additional stability you can also use steel joists that are built into one or both of the walls. In this type of construction the insulation is placed below the waterproof covering and on top of the roof deck and vapour barrier. Timber roof designing buildings wiki share your construction industry knowledge. The basic construction of a flat roof starts with roofing timber that is laid across two upright items usually two walls.

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So whether your new flat roof is to be made of timber concrete or felt or a combination of these materials you need to comply with flat roof building regulations.