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In the pitched roofing industry we all know that British Standard 5250, the Code of Practice for the Control of Condensation in Buildings, and the Building Regulations Approved Document F2, have for many years recommended that the way to control the build up of condensation in roofs is through the use of ventilation. The basic requirements for ventilating a traditional cold loft space are that air should enter the loft at the lowest point on one side of the roof and exit on the opposite side of the roof. Water vapour rises up through quilt or fibrous insulation, and meets the air in the loft, where some of the moisture is absorbed - the quantity depends on the air temperature. Always install low level roof space ventilation into a pitched roof!

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