We’re currently living in, and renovating a 1974 Wimpey no-fines house in Hampshire.

We’re waiting for some grey/graphite EPS EWI boards to be installed which should bring the u-value of the external walls down to 0.30 or there abouts. We’re keen to bring this down a bit further if possible by using IWI as well, but are concerned about moving the dew-point into the wall or worse, the IWI.

Can you advise?


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