Warm Deck Or Cold Deck Flat Roof

The thermal efficiency isn t as good as with warm roof insulation.

Warm deck or cold deck flat roof.

Therefore water vapour which enters the roof structure from the room below will not have a cold surface on which to condense. This outdated design is somewhat archaic and harks back to a time when insulation of all types was simply an afterthought. Warm deck sandwich or cold deck. Traditionally flat roofs are formed of single timber board or deck with a waterproof covering fitted to the top of the board.

The insulation in a warm deck roof is installed immediately below the roof membrane on top of the roof deck usually with a vapour control layer underneath the insulation. The recognised flat roof build ups for best design practices are. Traditional cold deck insulation. Converting a cold flat roof into a modern warm deck roof can be surprisingly economical.

Provided the existing roof is in a good state of repair and has a suitable structure a warm deck overlay can be applied. So i m looking into a warm deck conversion. Warm deck flat roof 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. Warm deck roof with this type of roof the insulation is placed above the roof deck but below the weatherproofing.

So now i m trying to find an insulation that gets the required u value without costing the earth. A warm deck also provides added protection from the dangers of condensation as the structure is kept warm at a temperature above dewpoint by the insulation above it. For most domestic purposes a warm deck flat roof is superior to a cold deck. 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. The current flat roof design is cold deck. Hi what roofing material would you be using for your flat 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.

There isn t enough space in the void for more insulation and an air gap. A cold flat roof insulation requires more work taking off old boards and replacing them and the roof surface. A cold flat roof does include insulation typically by way of kingspan or celotex insulation material inserted between joists. There should be no insulation below the deck and no ventilation is required.