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Movement crack. Usually the building is shifting one way or the other or both seasonally. It's a proper bitch to fix and some of them really can't be with normal paper. I've used 3 different types of lining paper to fix this over time, they all have different side effects but the cracks don't reappear. Fibre glass lining pressed into a special ground covered with normal paper, wallpaper with fibre glass centre (Wallrock fibreliner) and a new type from Germany which is the best finish but most expensive and has not been up long enough for me to say it will survive any movement.
The wallrock fibre liner is the most readily available but it has a slightly fluffy texture and can't be sanded at all, it's probably best lined with a standard lining paper to get a really nice smooth paintable surface. Alternatively you can paint it and very lightly denib the entire wall to get a smoother finish.
Should say you need to rake out the existing crack and fill with something flexible too, the process of doing that and ending up with a smooth enough surface is time consuming too.
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Airhead
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