There are a number of reasons for having a good Insulated Cavity Closers:
– Prevent water penetration – The use of a cavity closer will prevent the ingress of water around a window or door, as required for compliance with Building Regulations Part C. To achieve this it is important to set back the frame of a window a minimum of 30mm in to the cavity and to seal with a recognised sealant around the frame. Also a cavity closer with ridges on will further help prevent water penetration.
– Prevent heat loss and cold penetration – Cold bridging is when an area of a building has significantly higher heat transfer than the surrounding materials resulting in an overall reduction in thermal insulation of the building. The problems of cold bridging are recognised in the Building Regulation Part L. Insulated Cavity Closers are used to overcome thermal loss that occurs around unprotected cavities and reveals. Thermal loss can result in problems of condensation, staining and mould growth at the reveals of these openings. Prolonged exposure to such factors will lead to a deterioration of the internal plaster and paint work. The use of cavity closers will help to prevent the occurrence of such factors.
– Create a fire barrier – To comply with Building Regulation Part B a fire rated cavity closer should be used. A fire rated cavity closer can prevent the spread of fire for up to 1 hour. A purely insulted cavity closer without a fire rating will not actually comply with part B.
– Comply with Part L – Building Regulation Part L compliance is ever more important with sustainability being continually pushed up the agenda, therefore the more you can reduce heat loss the better. The minimum thermal resistance path through the cavity closer must be at least 0.45m2k/W the higher this number the lower the heat loss.