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Looks like it could have been poorly mixed too. It's not uncommon where there's no room for expansion/contraction that a small crack opens up, water gets in, freezes and expands the crack then stays wet and eventually destroys the mortar. There would normally be some kind of frame sealant to help avoid that.
A little shrunken head would look great in that hole though.
Airhead
Soul
Looks like the render around the window for the downstairs bathroom has disintegrated.
It's powdery and just falling away.
Obviously it needs replacing but anyone have any idea as to the possible cause? I don't just want to repair and have it happen again...