Don’t Worry Too Much About Hairline Cracks in Stucco

Feb 09, 2015

Do you have stucco siding in Kansas City? If so, you’ll want to take a couple laps around the house every once in a while to inspect the stucco to make sure that it’s in good shape. Every once in a while, you may spot a crack in your stucco. Fortunately, most cracks are only cosmetic issues. These types of cracks are known as hairline cracks.

stucco siding Kansas City
Source: Flickr

Stucco is made out of a Portland cement product, which means that no matter how well it was installed, it is still susceptible to small hairline cracks. There are a number of ways that you can prevent these hairline cracks from occurring, however. The following are a few standards to prevent hairline cracks in your stucco siding:

  • Your wood-based sheathing needs to be gapped at a minimum of 1/8 inch on all sides and edges.
  • The moisture content of your wood framing members needs to be less than 19.
  • Attach metal lath or woven wire along your framing supports.
  • Make sure the control and expansion joints are installed according to industry recommendations.
  • Only use clean washed plaster sand.
  • Don’t use cement rich mixes
  • Never soak your walls – only damp cure them in hot and dry weather.
  • During cure time, avoid drilling, pounding and other vibrations to the plaster membrane.
  • Let the base coat cure for a minimum of 14 days prior to finish.

You can cover hairline cracks that develop during the cure period using an acrylic finish material or a cement product.  They aren’t something to worry about.

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