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Previously I wrote about flanking noise around the party walls of pre-war houses so now I will talk about post-war houses. These are normally built with a cavity in the external structural walls and it is this cavity that can allow the easy passage of noise around the party wall into adjoining homes. We have already discussed how to address flanking noise through floors and ceiling
The problem with cavity walls is it is not only the cavity allowing the free passage of noise around the party wall but the internal masonry skin is often of low density blocks. In the early days these would be known as “breeze” blocks but in more recent years they have been replaced with even lower density blocks called “Thermalite” blocks. The Thermalite blocks are more efficient at allowing noise to be transmitted through them into adjoining rooms and are a particular problem with flats when flanking noise travels up and down through these blocks into flats above and below but the soundproofing of flats is an issue I will discuss in a later article. The best way to soundproof these walls to reduce flanking noise transmission is to install a 50mm M20AD solution but can be expensive so should only be installed in extreme cases where the flanking noise is more of a nuisance. If you still want to look at the M20AD solution to reduce flanking noise through a wall go to our web page via the following link M20AD To soundproof a wall.
And back to the cavities within the walls and the best way to treat these is to have blown mineral wool installed that will have the advantage of giving additional thermal insulation. Other types of thermal insulation such as injected foam or polystyrene will not be as efficient at absorbing the noise and could actually compound the problem making the noise being heard even clearer.
More information on how to soundproof a party wall can be found on our web page via this link soundproof a party wall.
This article explains how flanking noise uses the cavities and lightweight masonry of walls to gain access. More about how to soundproof a party wall will be published in the near future. If you want to see how we can help soundproof a home or garage, go to our web site via this link. Soundproof a home.