![]() Wide cracks: A crack of 1/4 inch to 1/2 inch in width is problematic it's a sign of something going on that is more serious than a house settling or climate control issues. ![]() They are most common in the first 10 years of plaster installation. Diagonal, horizontal, or vertical cracks: These streak-like cracks are structural cracks caused by foundation movement, moisture expansion, or plaster drying and shrinking.This is a sign of a bigger problem that should be remedied immediately. It could be from outside water getting in or a pipe in the walls that has sprung a leak. Bubbling or discoloration of plaster: If you notice cracks that include bubbling, wetness, discoloration, or water stains, you likely have water seeping into the wall.The outer layer may only need removal and replastering. When you hit lath, stopthe bit won’t go through woodpull out the bit, and drill another hole about 3 inches from the first and about 2 inches from the crack. Bulging is usually caused by a simple problem like the outer layer separated from the inner layer of plaster, called delamination. Using a 3/16-inch masonry bit, drill a hole in the plaster about 2 inches from the crack. Bulging: Bulges in plaster create small cracks emanating from them.Hairline cracks are usually caused by plaster drying, expanding, and contracting. There is no need to bother with them unless you want to clean them up cosmetically. When you tighten the bolt, it pulls the wings against the back of the laths, creating a securely anchored bolt. The wings fold up as it enters the hole, and then they spring out on the other side. Hairline or spiderweb cracks: These cracks are benign they are so small that you can hardly fit a fingernail in them. It's a bolt that screws into a pair of spring-loaded metal 'wings.' You drill a hole in the wall and insert the bolt into the hole.The Spruce Home Improvement Review Board.
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