Hi There, I just wanted to share my experiences with one of the biggest stressors for me on the self build, leaking windows - I had 3 of them  and it drove me mad. I'm here to share the experience and ask opinions on potential fixes...First of all I didn't want moustaches on my windows like this:     I can moan about the detail but in fairness......At least it's watertight     Here are my leaking windows, the Stone window/Doors have a different detail