Lath and plaster ceiling cracks12/8/2023 ![]() ![]() The plaster forms a key as it is forced between the laths. Wet plaster is applied to the laths, usually in several layers. 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. Laths are thin strips of timbers which are fixed to the structure.This board had holes regularly spaced, providing room for wet plaster to keep the insulation intact. During that time, rock lath, also called gypsum board, was developed. They are most common in the first 10 years of plaster installation. While lath and plaster was popular into the 20th century, newer methods were developed during the 1930s. 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. Bulging is usually caused by a simple problem like the outer layer separated from the inner layer of plaster, called delamination. 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. Hairline or spiderweb cracks: These cracks are benign they are so small that you can hardly fit a fingernail in them.The Spruce Home Improvement Review Board. ![]()
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