We had external wall insulation fitted to our 1930s semi with solid walls while having it extended. Problem was builders discovered the half bay (which would have had crittall curved steel windows) was cracking above the weak pvc windows. They said that no upvc window strong enough to support the weight of bricks so recreated the curved bay between the upper and lower floors in timber, then added the insulation and then rendered. We did have new stronger windows fitted. Trouble is it leaks, inside, and looks like it is running with water outside through the insulation when it rains. So questions, is something missing to make it waterproof? And can we really not build the bay back in brick? I fear wet rot and dry rot! Any advice on this gratefully received.
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