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Internal wall insulation or not?
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If the cavity wall insulation checks out OK I don't think I'd bother with internal wall insulation, but if you are gutting and redecorating then as a belt and braces job it can only help.
We have a detached solid wall cottage and suffered terribly from condensation and black mould in the bedrooms with the walls running at times. It didn't matter how high I set the heating the rooms always felt cold ! One by one I fitted Celotex (insulation backed) boards (40mm),dot and dab to all external walls in all the bedrooms and bathrooms and then re-plastered.
The difference is remarkable. Rooms stay warm and dry and heating is hardly needed, the Rayburn in the kitchen keeps the chill off all on it's own as the heat rising through the house is retained rather than lost. Wish I'd done it years ago !
We did look at the celotex stuff.
Had the cwi surveyor out today who told us that apparently we can't top up cwi. Looks like we are stuck with not knowing how good it is or even how old it is!
Definitely need to re-think the internal wall insulation now.0
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