I live in a 1930’s semi with a single skin upstairs half bay window. The wall under the window gets so cold in winter that we get mould appearing. There is an air brick in the wall so air flow is reasonable. But I wanted to know if there’s any covering that could go on the inside of the wall. I am in the process of costing exterior eps insulation, but that’s for sometime down the road. Any help/guidance would be great fully received.
Neal