How to Check If the Cracks in Walls Are Serious | Repairing Cracks in Plaster

Whether drywall, plaster, or concrete, walls are susceptible to cracks, and even walls in newly built homes are prone to cracks which normally occur from settling.

Homes are constantly settling as different construction materials expand and contract at different rates. Fluctuating humidity levels, soil movement and shallow foundations are typically responsible for settling, which may result in cracks in the ceiling or walls.

Although generally a cracked wall is nothing to worry about, certain cracks indicate serious structural damage. Regularly inspect cracks above door frames and in walls for certain signs to determine whether the cracks require professional attention.

Vertical and horizontal cracks in drywall or plaster walls typically indicate drying and shrinkage, which is normal after construction.

Jagged cracks, stair step cracks and 45 degree angle cracks generally signifies structural movement or settling issues that are occasionally serious but usually harmless.

Measure the width of cracks with measuring tape, because typically wider cracks signify more serious issues than thinner cracks.

Cracks less than 1/8 inch are considered stress cracks and are harmless, while cracks 1/4 inch wide and larger are often more serious.

Long horizontal cracks that extend along the joints where interior partition walls and upstairs ceilings connect generally signify roof truss issues which caused ceilings to detach from walls. These cracks are serious and require professional attention.

Small cracks located above interior windows or doors are usually harmless.

If drywall or plaster surrounding the crack feels damp, you may have a water infiltration issue. Never take chances with cracks that leak, because these are sometimes serious.

Vertical and diagonal cracks in concrete walls typically indicate foundation movement. If a vertical crack widens at the top or bottom, the wall is either settling or gradually heaving, which may present serious issues.

Stair-step cracks may also signify heaving. Horizontal cracks in concrete walls, however, indicate poor wall designs or pressure buildup behind the wall. Concrete walls containing horizontal cracks are serious issues.

Measure the width of cracks with measuring tape: cracks less than 1/8 inch are likely stress cracks, while larger ones are often more serious.

Inspect the position of the crack after measuring its width. Short thin cracks around windows are typically harmless and require no attention. Stair-step cracks that start at the corners of windows or doors generally signify that foundations are either settling or heaving and may present serious issues.

Check where the water is leaking into the crack. If the concrete surrounding the crack feels damp or contains white powdery stains, you may have a water infiltration issue. Leaking cracks in concrete require immediate attention.

If you notice any cracks that you cannot classify or believe may be serious, it is best to hire a structural engineer to inspect them.

Any crack that rapidly widens, expands in length or changes in any other way could present serious issues. Do not attempt to repair these serious cracks without first speaking with a professional.