Timber Cold Flat Roof Construction

So any timber joists that are used need to be strong enough to support this weight.

Timber cold flat roof construction.

There must be an adequate void minimum 50mm between the deck and the insulation traditionally mineral wool to allow free movement of air and to prevent moisture vapour being transmitted from the building outwards where it could condensate in the roof. In the warm flat roof construction there is insulation packed into every possible space where air can flow. The insulation is below the deck but above the plasterboard. Hopefully this video will help explain the difference between cold flat roof construction and warm flat roof construction this videos show detailed drawings.

In a cold roof construction the sarnafil membrane is installed directly to the structural decking usually timber with firrings to fall. Old asbestos roofs are often replaced with flat roofs. Refurbishing an existing timber joisted flat roof which has no insulation. The major difference between the warm flat roof and the cold flat roof has to do with the air flow between the roofing timbers known as joists that help to hold up the roof.

This is used for refurbishment e g. This ventilation is necessary to prevent condensation from forming below the roof deck which can. As you may imagine there is a fair amount of weight involved here in terms of boards felt etc.