Humidity, temperature & leaks
Humidity and temperature may cause or contribute to drywall cracks, including those at door and window corners. Small changes in temperature or humidity will usually not have any significant effect on drywall. Larger differences can affect drywall and wood framing.
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Are cracks under windows normal?Why it happens: In a nutshell, it happens because things move. The ground beneath your foundation tends to shift slightly with changes in weather. These tiny movements aren't dangerous, but they can lead to small, non-damaging cracks in the weak spots in your walls—the places where doors and windows have been inserted.
Is it normal to have cracks around windows?
Cracks around window frames can appear in houses of any age. They can be the result of the natural settling of a house over time, which causes plaster to crack, or the poor installation of windows.
What causes cracks around window sill?
Cracks to window sills.
Often this problem is due to damp, or water getting into the sill in some way or another. Replacing the window sill is not the solution to this problem, a full diagnostic survey should be carried out to find and treat the source of the problem.
What do cracks under windows mean?
Why it happens:
In a nutshell, it happens because things move. The ground beneath your foundation tends to shift slightly with changes in weather. These tiny movements aren't dangerous, but they can lead to small, non-damaging cracks in the weak spots in your walls—the places where doors and windows have been inserted.
Cracks form due to stress placed on the seams. These cracks tend to occur around high-stress areas like windows, door frames, and corners. This stress can come from many sources. Temperature fluctuations can cause the drywall to expand and contract creating stress that cracks the seams.
Hairline cracks over doors and windows are likely due to settling. Houses of any age move and shift subtly over time, and the weakest area in a wall is the most likely to crack. A wall is constructed with vertical studs that extend from floor to ceiling.
The rule of thumb: If a crack is a quarter-inch wide or wider, then there's concern. Inside the home, drywall can crack as well. “A drywall crack that starts at any corner of a window or the upper corner of any door, at about a 45-degree angle, indicates settlement in the home,” Fenimore says.
Causes of Flaky and Cracking Paint
Water/Humidity: Paint that's applied to a damp surface or paint that's exposed to high humidity can peel easily. Lack of Surface Preparation: When your paint surface is dirty or isn't primed properly it's prone to cracking and flaking even with a just a thin layer.
Paint usually peels from window sills and frames because of moisture. Water standing on the sills eventually penetrates the paint film. When it later evaporates, the pressure from under the film causes peeling. This moisture may be condensation on the interior, or rain and snow on the exterior.