Blown in wall insulation is AIUI a good thing for saving money. However what happens when you start making structural changes? If you cut into a cavity wall does all the insulation trickle out? Or is it more stable than that?
We are about to embark on the first stage of our house remodelling which will involve a certain amount of hackery of walls.
Cheers
Dave R
It doesn't pour out, although you will probably lose a few small bits, just use normal loft insulation fibreglass stuffed into any holes you make, unless you have cavity batts to hand, which are better, but not essential
That was my experience too.
Cheers Richard
The one type of CWI that tends to pour out is unglued polystyrene bead.
NT
Someone I know had an side extension built. Although there were the tell-tale holes in the outside wall where the insulation had/should-have-been injected, once the bricks were removed to complete the extension, there was no insulation at all - none whatsoever in any of the side cavity running the length of his house.
In the early days of cavity wall pumped foam, it occasionally happened the wrong mixes were used and the foam totally collapsed into a thin flake at the bottom of the cavity.
In message , Grimly Curmudgeon writes
Partially poisoning the occupants in the process. The "authorities" then decided that this couldn't happen any more so they removed the testing facility. It can't happen therefore we don' test for it therefore it doesn't happen.
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