Cavity wall insulation is a substance that is applied to decrease heat loss in your home. It works by filling the gap between the bricks in your walls. This lowers the transfer of heat from inside your house to the outside. Approximately 33% of the heat generated in your home escapes through its outer walls. As a result, adding wall insulation may save.



Scottish houses built before the 1920s had solid brick or stone walls. If your property was erected after this time, there’s a chance it has a gap between the bricks of its external walls. Scottish homes with solid walls prior to this period are uncommon. Our specialists can verify this by drilling a tiny hole in your wall and peering inside using specialised.

Your house will usually be suitable for cavity wall insulation if:


  • Your external walls are unfilled cavity walls
  • The cavity is at least 50mm wide
  • The masonry is in good condition
  • It was built after the 1920s


It’s always very important to get a reputable company to carry out a survey before installing cavity wall insulation – Here are the reasons why.




Internal dampness is the most visible signal of a problem when retrofit cavity wall insulation is put in a house that was built or situated in a manner that dictates it should not have cavities filled.

Most homeowners are blissfully ignorant of the fact that cavity wall insulation has not been installed correctly. They don’t know if it’s been overpackaged, underfilled, slumped, or missed areas. Vents have been clogged, and obstructions have gone unnoticed. This is because even though the energy savings will not be as great as advertised.

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Condensation causes dampness, which is prone to soaking up insulation. We’re now receiving a lot of calls from customers who have cavity wall insulation in their homes — it’s getting colder and colder by the day. The solution is straightforward. Cavity walls were created to breathe effectively. The original intention of cavities was to be used in coastal regions Rain hits the outside wall, and it is able because the wall is only single brick, to get through It then runs down inside the cavity and exits via the bottom Airflow in the cavity keeps things nice and dry.

Remember, dry items do not conduct heat. Wet things conduct and lose heat quickly. If your cavity is filled – as it will be if you use a polyethene sealant to fill the gaps between the tiles – you’ll destroy any hope of your home remaining dry. Water easily passes through the outer leaf and soaks up any moisture in the Condensation from the house also gets through the wall on the inside – and instead of wicking away through the cavity, it finds a nice fluffy mess of waste paper or waste cotton. It all gets wet. And it stays wet. So now, your house has wet walls, and a much greater ability to lose heat through the walls – once upon a time, they were nice and dry. Now they are wet, so they are colder.

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You should use brick ties to ‘tie’ all cavities. If they remain dry, they don’t rust. The bricks become damp and stay so. They also rust away. As a result, the wall is no longer connected, and it may expand or collapse due to moisture infiltration. Cavity insulation is also great for mouse families—you’ll find lots of lovely mouse nests, rats, and you name it. They adore the stuff. That’s rubbish. Have you ever seen a mouse eat plastic? Mice are extremely adaptable to their surroundings, and in the event that you have an infestation, they can become a real problem. They’ll chew through bags of construction chemicals in our store – and keep eating. It has no effect on them.

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