Cavity wall insulation - does it deteriorate?

Klug

Hi

We have an old house that apparantly was fitted with cavity wall insulation back in the 70's (got holes in the wall and a certificate) lol!
Can anyone advise if the insulation deteriorates over time please as the house feels cold most of the time despite new windows.
If so, how do you know what state its in?
Thanks

LisaLou1982

If the CWI was installed in the 70's then it will be a foam material which has been known to deteriorate over time. The only way to check what state its in is to drill a hole and check the cavity but its known to deteriorate more around the windows.

We now use much better materials which is more effective but, short of extracting it, which is costly, theres not much else you can do

Johnjohn

Some types of cavity wall insulation can lose their insulation properties when they get damp. If rain is penetrating through the outer skin the insulation will get damp and be less effective.