What Is A Cavity Closer And Why Is It Important?

Before being able to answer the question of what is a cavity closer

, it is first important to discuss what a cavity wall is. A cavity wall is an external wall of a house that has an air gap built in between it and the internal wall. These types of masonry walls havent always been used to construct houses, and it wasnt until the nineteenth century that they began to be introduced. Houses without the incorporation of a cavity were and in fact still are prone to damp and excess moisture caused by water being absorbed through the external wall. The presence of an air gap means that water is unable to seep through to the internal wall and instead drains away through holes at the bottom of the wall. This kind of wall is imperative in countries with lots of rain as otherwise damp and mould can begin to take hold. Damp walls eventually begin to deteriorate altogether.

As well as keeping moisture out of the house, air gaps within the exterior walls of a house also offer the additional benefit of sound protection and going a step further still they offer a good layer of insulation too. The air gap prevents both sound and heat from travelling between the inside and the outside. That means internal sounds and heat are kept in, and external sounds and heat from the summer sun are kept out.

It is possible to add further insulation to the cavity walls if you are looking for extra assistance in keeping energy bills down. There are a variety of specialist insulation materials that can be fitted in the air gap that go even further to provide thermal insulation. This can conserve up to 35% of heat from escaping which can have a dramatic effect on your heating bills. Other ways to improve the conservation of heat in your home are to use cavity closers. These provide a very tight seal between the wall and the door and window frames. Traditionally this is a place where heat has been able to escape from, but with cavity closers acting as a barrier there is little chance of this happening. The ideal material in which cavity closers are made of is uPVC or unplasticized polyvinyl chloride which is extremely long lasting, has excellent thermal insulation properties and is 100% recyclable too. It is also fire-resistant which is very important when it comes to house construction.

To add a further layer of protection against fire, cavity fire barriers can also be used around the whole house. These are used within the cavity of the wall and provide a layer that prevents fires from spreading. They can hold strong for up to an hour which can be the difference between a destroyed house and a salvageable one. Despite uPVC cavity closers being fire resistant themselves, additional fire protection should be used in the area around the door and window frames, as this is a place that fire can easily spread.

Having a warm, safe and insulated home is extremely important. Adding cavity closers, insulation and a layer of fire-proofing isnt very expensive and can provide a wealth of comfort and security. If you are moving into a new build, then the chances are good that a cavity wall with insulation and fire protection will be present, and that cavity closers with additional fire protection are in place. If you are building a home then you may want to check on this at the beginning.

So to summarise, a cavity closer is used to create an air tight seal around windows and doors where a cavity may be present. Made of recycled building materials, uPVC is the ideal material to use for this purpose and is often designed with trickle vents for additional ventilation.

by: Chris Coxon

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