Cold Deck Flat Roof Scotland

Cold roofs have the waterproof layer placed directly onto the roof deck and the insulation inside the roof just above the ceiling.

Cold deck flat roof scotland.

There are two types of flat roof. Flat roof u value 0 18 w m2k 2 warm deck flat roof the type of insulation for this is usually of a rigid type and the thickness will vary depending on the manufacturer s specifications. This is placed over the roof joists and a board normally external ply is laid on top. A warm roof and a cold roof.

Thickness varies according to the manufacturer s specifications. Cold roofs and warm roofs. The 18mm roof grade deck is then fixed on top of the rafters leaving suitable air flow between the insulation and the deck. Cold roofs involve the thermal installation being installed between the joists and below the structural deck.

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. 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. Although the regulations do not prevent the use of cold roof constructions warm roof constructions are recommended. As the insulation is not required to take any loads quilts and other loose fill materials can be used as well as rigid insulation.

The roof itself is therefore kept warm. In a cold roof the thermal insulation is laid between the joists below the structural deck. A warm roof is defined as being when the all or the majority of the insulation is above the joists or deck. The epdm rubber roof membrane is then installed using the contact adhesive onto the deck.

This is known as a cold roof because the roof deck and roof space are close to the external air temperature. Although not recommended today and actually banned in scotland until recently cold flat roofs were fairly common. In this case ventilation is required and the roof can still become wet with condensation which may cause materials to decay. Cold flat roofs are found in many homes around the uk though they are not recommended these days and are actually banned in scotland.

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