Cold Deck Roof Construction

Guidance advice on.

Cold deck roof construction. Plywood the insulation is fixed directly on top often with. Ventilation is required for these roofs. Where the existing roof deck is in satisfactory condition and of a suitable material e g. A cold roof construction will normally comprise of a structural deck on joists or purlins with a ceiling layer fixed to the bottom of the joists purlins thereby creating an air layer or cavity within.

It is usually the most acceptable type of construction for domestic possessions and belongings as it avoids the need for aeration of the roof construction. In the case of cold. Cold deck roof a cold deck roof is where the insulation is placed between the joists rafters or in between the ceiling joists in the case of a pitch roof. A cold flat roof insulation requires more work taking off old boards and replacing them and the roof surface.

The breakdown warm roof vs cold roof. Throughout the course of the year the roof deck and all below it is kept at a temperature close to that of the inside of the building therefore the roof structure is protected from extremes of hot and cold lessening the potential for damage caused by thermal movement. The membrane is then attached to the insulation. Warm roof insulation ensures the entire roof structure is insulated meaning a warm deck roof is more energy efficient than a cold roof.

A cold deck is constructed as follows. This video shows the key features of a flat roof cold deck construction and how to draw the details to a scale of 1 10. The insulation material is placed immediately above the ceiling between the rafters. The 18mm roof grade deck is then fixed on top of the rafters leaving.

This cold deck construction is considered problematic in the humid temperate climate of the uk where the effective ventilation of restricted roof voids may be impractical particularly in sheltered built up areas. Less thermally efficient than a warm roof construction cold roof construction remains the most common form of construction for existing flat roofs.