how can i ge round the problem of having to fit a cavity tray, when the whole house has cavity wall insulation! surley its just gonna fall down and fill the tray anyway? am i right in thinking 99% of wall insulation stops this any way, more so if its simular to "instafibre".
would treating the wall with a clear waterproofer help?
there is no way to install cavity trays unless you demolish the external brickwork above each opening
the insulation has some waterproof resistance but you could spray a clear silicone solution to the walls,it all helps
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