Anybody got any advice on which cavity wall insulation to go for for an existing detached house. I had Rockwool pumped into the cavity a previous house I lived in and I was very impressed with that. But interested in any other experiences/opnions
i would always prefer rockwool over polystyrene beads.
Its pumped in at higher pressures, therefore i feel it fills the cavity better. Beads need a proper mixture of glue to make it waterproof, and ive heard stories of some bad installations where the beads pour our unbonded.