I have recently noticed plaster cracks on internal walls in my 1980s semi d. They literally just appeared one day . horizontal , on about 8 walls internally and approx 1 metre in length. not deep. plaster bubbling is what they look like and when i peel off some I can dig in a small bit less than 1mm I reckon. They look very bad/worrying. House is set off a slightly sloping driveway approx 1 metre below street . gutters leaked last winter and drains also were clogged leading to build up of water of c 2/3 inches at times in heavy rains . No wetness or flooding internally. House is a bit damp feel wise
Any ideas or should I be seeking an engineer to inspect ? Or just replaster/repaint ?
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