Flat Timber Roof Detail

The insulation is below the deck but above the plasterboard.

Flat timber roof detail.

Rainer barthel 1 loadbearing structure matthias beckh mark. This ensures that the deck holds a warm temperature during the winter. The flat roof is an architectural device that is loved by designers for its ability to create simplistic linear forms. The construction of the flat roof is similar to that of the timber upper floor.

Having a manual for warm flat roof construction with details and a summary of rules to follow helps. 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. In this type of construction the insulation is placed below the waterproof covering and on top of the roof deck and vapour barrier. Trada and approved document part a give guidance on sizes of joists for flat roofs relating to spans and loading.

The evolution of the flat roof christian schittich. Refurbishing an existing timber joisted flat roof which has no insulation. For additional stability you can also use steel joists that are built into one or both of the walls. Flat roofs aren t actually flat but must slope to drain water.

The basic construction of a flat roof starts with roofing timber that is laid across two upright items usually two walls. A cold flat roof is one where the insulation is between or between and below the roof joists. Joists are placed on edge spaced at 400 600mm centres supported by external and internal load bearing walls. The flat roof shown above shows warm deck roof construction.

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. 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. A roof which is approximately flat is called as a flat roof. Flat roofs can be used to create box shapes cantilevered into daring overhangs or can be planted to create usable vegetated gardens.

Normally a slope of inch per foot is used. This is used for refurbishment e g. Usually a flat roof is built with a slight slope to provide some drainage.