Do I need to use a cavity closer?

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    What are cavity closers?

    Firstly it needs to be stated that Cavity closers are an essential part of any cavity wall.

    What exactly are cavity closers and how do you fit a cavity closer

    What is a cavity closer?

    A cavity closer fits within a cavity wall at the reveals where windows and doors are fitted. Cavity closers are required for 3 key reasons:

    – To prevent water ingress
    – To reduce heat loss
    – To improve fire safety

    The cavity closer acts as a seal, preventing external water droplets and damp from entering the cavity wall and the building, whilst also preventing heat from being lost through the gap. Cavity closers can be used in a range of different constructions, including masonry, timber frame and steel frame systems.

    All Dacatie cavity closers are Insulated cavity closers, meaning there is a damp proof membrane to help prevent the ingress of water (which causes damp and condensation issues), as well as PVC extrusions. However, an insulated cavity closer also features a layer of insulation, such as XPS insulation, to further increase the thermally insulating capabilities of the cavity closer. Insulated cavity closers are particularly useful in projects where sustainability, minimal energy consumption and insulation are key factors.

    Improve fire safety:

    Firstly, a cavity closer will help to improve the fire safety of the building, particularly when the cavity closer is specifically a fire rated cavity closer – fire rated cavity closers can prevent the spread of fire for 30 minutes or an hour, depending on the fire rated product you choose. Fire rated cavity closers can help to ensure your building is compliant with Building Regulations Part B (fire safety).

    Reduce heat loss:

    Secondly, cold bridging commonly occurs around windows and doors, where heat transfer is much greater, significantly reducing thermal insulation. The cavity closer prevents thermal loss from occurring within uninsulated cavity walls, which is important for Building Regulations Part L (conservation of fuel and power), because it helps to reduce the amount of energy used to keep the building warm. Part L building regulations are becoming increasingly important as the drive to become more sustainable and conserve more energy grows.

    Prevent water ingress

    Finally, a cavity closer will prevent the ingress of water occurring around the edges of a window or door, acting as a damp proof course, reducing the potential for damp, condensation and mould from occurring. This is important to ensure the building complies with Building Regulations Part C (resistance to contaminants and moisture).


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