Hello all,
Looking for some guidance here. We are having an extension built onto our 1930's house (semi). The new walls are built from block with a 100mm cavity. The cavity is filled with 50mm celotex. Once finished, the exterior walls will be rendered.
My question, is it worth insulating the inside of the wall too, prior to any plaster/plasterboard finish?
I understand that there is a danger of condensation if the interior insulation is greater than the cavity (50mm) so a vapour barrier is required. But is it even worth considering or is 50mm celotex in the cavity sufficient?
thanks.
jim
Looking for some guidance here. We are having an extension built onto our 1930's house (semi). The new walls are built from block with a 100mm cavity. The cavity is filled with 50mm celotex. Once finished, the exterior walls will be rendered.
My question, is it worth insulating the inside of the wall too, prior to any plaster/plasterboard finish?
I understand that there is a danger of condensation if the interior insulation is greater than the cavity (50mm) so a vapour barrier is required. But is it even worth considering or is 50mm celotex in the cavity sufficient?
thanks.
jim