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Yeah, head scratcher with boring simple potential answers, material with differing rigidity. If there's a skim is of different plasters it's one weakness. The sliding doors & frame appear metal this carries vibration force from opening and closing (not as harsh as plastic) but still a good slam.. as you say it follows the lintel.. why are the cracks formed as if it from plasterboard idk
bluehuw-
I dont think the builders plaster boarded underneath, though I'm not certain. Likely a skim ot replaster.
The cracks neatly follow the outline of the lintel to the top and where the solid wall stops to the sides . So could be movement in the framing, but why would it start moving after 2 years?
Sliding door is indeed metal, but its to a first floor balcony, so hasnt been opened in months.
Original Lintel was replaced as it wasn't strong enough, you could see all the exterior titles sagging because of it. I did check outside today, and the tiles are still straight , no sag.
chrismanc
Any idea why this is happening?
Cracks have appeared in the plaster of my back wall. Has happened suddenly sometime in the past few days .
1960s build, solid side walls with a wooden frame to the front and rear elevations. Tiles exterior on the wooden frames to front and rear . The cracks follow the outline of the wooden frame. The worst of them in line with the bottom of the lintel above a set of sliding doors.
House was refurbished ~2 years ago. No cracks for the past two winters and no changes to ambient indoor temperature . Currently no sign of water ingress , wall feels dry.
There is obviously movement in the wall , but I have no idea why . Plaster to the floor above looks fine however