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Why does stucco crack?

Wednesday, April 4, 2018
Why does stucco crack?

Because stucco is a rigid material, it doesn’t flex or shift as your house ages. As seasonal changes cause small expansion and contracting in the materials that compose your home, the stucco is put under pressure in new ways. Additionally, a home can settle over time, sinking tiny amounts here and there. These shifts are normal, but they are not always friendly to your stucco. So when your house goes through these minor changes, the exterior stucco will begin to show cracks.

Unlike hairline cracks, a large stucco crack may indicate a structural problem. Often, large cracks develop at the intersection of vertical walls, at the upper corners of window and door frames, or at joints between wood framing and concrete/brick masonry. Since most large cracks aren’t only wide but also deep, they allow moisture and water to penetrate the building envelope and pass freely through walls.

The most “dangerous” cracks are typically wider than 1/16 inches, with edges that are no longer aligned parallel to each other. If the edge of a crack has moved in relation to the other edge, it may indicate unusual structural changes in your home. As an example, when the foundation settles more on one side of a house than on the other, it may create enough stress for stucco to crack. To correctly address and fix potential structural problems, it’s very important to investigate large cracks before any attempt is made to repair them.

3 thoughts on “Why does stucco crack?

  1. Ryan@BlueCollarStucc says:
    May 14, 2018 at 4:44 pm

    These larger structural cracks are a lot harder to repair and I always try to discuss the options with the homeowner. Like you stated in your article they are a sign of more serious problems and likely settling from the building and will require a lot more attention than hairline cracks. Great article with loads of useful information for anybody out there wanting to know about structural cracks in comparison to hairline cracking.

  2. nini says:
    November 15, 2018 at 2:41 pm

    Last week, I found a similar style coat on this website, the price is cheap, I am very worried about quality, I hope to give some advice.

  3. Arifur Rahman says:
    May 16, 2019 at 1:59 am

    Thanks for your helpful article

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