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Well you can go thicker with the PB but you have to be aware of interstitial condensation and fix to walls accordingly. (Dot/dab or battens)
I’ll be fitting 62mm kooltherm K118 dot/dab to a 50’s flat in the new year.
I’m not going to be battling damp though as external brickwork is in good condition and no rising damp as it’s on 6th floor.
Solid walls would mean a bit more thought regarding any existing damp issues.
I’m hoping it makes a difference to warmth/heating and also in the summer.
Mr_Smyth
@terlg
Any thoughts on PIR backed plasterboard vs. insulating plaster for internal wall insulation?