Warm Deck Or Cold Deck Flat Roof

Warm deck roof a warm deck roof is where the insulation is placed on top of the rafters joists and the roof covering is then placed over the insulation.

Warm deck or cold deck flat roof.

Solid closed cell roof insulation such as celotex is placed on top of the roof deck rather than in between the rafters. A vapour barrier needs to be installed to reduce condensation in the roof structure. In the case of a flat roof insulation is usually either a rigid board above the deck or a mineral glass wool quilt immediately above the underdrawn ceiling depending on the type of roof design and construction. Flat roofs there are two common forms of construction for flat roofs.

There should be no insulation below the deck and no ventilation is required. The insulation material is placed immediately above the ceiling between the rafters. Warm deck sandwich or cold deck. Warm deck roof with this type of roof the insulation is placed above the roof deck but below the weatherproofing.

No ventilation is required for these types. The solution warm deck insulation. By moving the insulation to the outside of the structure the roof deck is effectively brought inside which results in a warm deck hence the name this removes the the possibility of condensation forming on the underside of the deck and eliminates damp. Types of warm deck roof.

The recognised flat roof build ups for best design practices are. There are two forms of warm deck roof. Inverted warm deck roof. Fortunately these days there is a better form of insulation available for your flat roof.

Provided the existing roof is in a good state of repair and has a suitable structure a warm deck overlay can be applied. The layer of insulation is essentially placed outside of the roof. The sandwich warm deck roof is the most common type of flat roof. For most domestic purposes a warm deck flat roof is superior to a cold deck.

Converting a cold flat roof into a modern warm deck roof can be surprisingly economical. The insulation is placed below the waterproof covering and is either mechanically fixed or bitumen bonded on to the top of the deck. A cold deck is constructed as follows. Contrasted with the cold deck roof this construction has a much lower risk of condensation as the void will be of a comparable temperature to the roof.

Warm deck flat roof. Less thermally efficient than a warm roof construction cold roof construction remains the most common form of construction for existing flat roofs.