Hi all, speaking to an elderly neighbour this morning, she is having some fellows come round today to insulate the cavity walls in her house. The house is a 2002 build, breeze block with a rough texture concrete render. I can think of a few potential issues here:
1: They will cause a mess drilling into the walls, at the very least she will have to have the house repainted or re-rendered
2: The foam or whatever it is they pump into the cavity will break the air gap, allowing damp to penetrate the inside skin
3: She has one westerly-facing wall which is often exposed to driving rain (this is Wales!) - maybe water will penetrate the render and blow it if the insulation guys don't seal the holes properly.
Just trying to look out for her really, she's quite vulnerable and alarm bells are ringing, especially as apparently this is being done for free.
Am I right to be concerned?