What is the difference between a warm pitched roof and a cold pitched roof?
A warm roof and a cold roof are two different ways of insulating a roof. A warm roof building will make the entire structure of the building warm in an attempt to avoid any cold bridging. It is where the insulation is located ‘above’ or ‘above and between’ timber rafters. Cold bridging refers to an element of the building (the roof in this case), which is allowing heat transfer and loss of energy. A cold pitched roof is where the insulation is placed either ‘between’ or ‘between and under’ the rafters or at ceiling joist level. This type of insulation system can be ventilated or not ventilated. However, if the roof is not ventilated then it will require a breathable membrane between the insulation and structure. If you live in an old building you may find that your roofing underlay is sarking felt, if so, you will need to allow for a 50mm area of ventilation between the insulation and the top of the rafters.
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