Mould and damp after Thermal Lining Paper

FreeBear

If you have badly fitted windows, you are on a hiding to nothing.

With a foam gun, I would have filled the gaps with expanding foam before plastering. If there are gaps visible from outside, apply expanding foam, cut back once set, then use mastic to seal it and fix some uPVC trim. If the windows are a recent install, get the fitters back to do a proper job.

Always use a gun with expanding foam - It is much easier to put down a thin bead exactly where required, and the nozzle can get in the gaps. Where the nozzle is too big, nab the plastic nozzle from a cartridge of mastic and shove it on to the end of the foam gun.

ChasingtheWelshdream

Where the nozzle is too big, nab the plastic nozzle from a cartridge of mastic and shove it on to the end of the foam gun.

@FreeBear Just wanted to say thank you for an awesome tip! I had been struggling to get my foam gun in a small space today and then was browsing this thread on a break. 😁

FreeBear

ChasingtheWelshdream said:

Where the nozzle is too big, nab the plastic nozzle from a cartridge of mastic and shove it on to the end of the foam gun.

@FreeBear Just wanted to say thank you for an awesome tip! I had been struggling to get my foam gun in a small space today and then was browsing this thread on a break. 😁

No, the tip is from a cartridge of mastic/sealant (I just nicked it from the last DG installer I used)