Cavity wall insulation a way of saving money or in some cases a free path to causing damp within your property.
Cavity walls were introduced around the early 1900’s ,originally to properties constructed in coastal areas and properties in exposed conditions to reduce the risk of rain penetration from driving rain, prior to this properties were constructed of thick stone wall structures or two separate leafs of masonry infilled with rubble.
It wasn’t until the 1920s when building regulations started to introduce cavity wall construction which became the standard form of wall construction by 1940, the standard wall construction being two leafs of brickwork with a standard cavity of approximately 50mm the outer leaf being supported by wall ties.
So if the cavity wall was designed to prevent penetrating dampness why would you want to fill the cavity?
If we believe the sales talk ,cavity wall insulation is installed to keep your home warmer and save you money as well as save the planet, by reducing the fuel we use, so reducing the greenhouse gasses we produce, the salesman (Surveyor) normally has very little or no training and even less knowledge of building construction, hence why the cavity wall insulation companies now have contracts with companies, which make a living from removing cavity wall insulation.
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