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Stucco Finish

Can This Centuries-Old House Finish Solve Your Siding Problems?

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When most homeowners think of siding, they may think of vinyl, fiber-cement, or plywood. But there is one type of "siding" that has been around for centuries that lets you avoid the problem of dealing with pesky vinyl siding salesmen. It's stucco finish, and unlike other types of house finishes, it applies equally well over masonry and wood-sheathed homes.

But if you're looking for an easy way out, stucco is not it. Stucco does have its advantages over traditional siding materials, but it also has some downsides. Stucco Finish - In a Nutshell

  • Stucco is typically tinted to add color, rather than painted.
  • Requiring professional installation. DIY not recommended.
  • Expected to last fifty years or more, but needs proper maintenance.
  • Considered one of the cheaper types of "siding" because it is low on expensive materials; it's mostly labor.
  • Stucco finish can be damaged quite easily.

What Is Stucco?

Stucco itself is a cement-type mixture. It is made up of sand, Portland cement, lime, and water. Stucco is really considered a thin finish coat, the outermost layer that is visible and can be painted. But to make stucco work, you need layers below it to provide an adequate base. It is not necessary to mix stucco from raw ingredients; you can buy pre-mixed stucco finish, requiring only the addition of water.

The Layers of Stucco: Over Wood or Masonry

The natural place to install a stucco finish is over concrete masonry. Concrete masonry is stable and less prone to expansion and contraction and other movement that may crack the stucco. While stucco finish can be applied to a wood-sheathed home, additional reinforcement is needed.

On concrete masonry, little other than a scratch coat is needed below the stucco finish. A scratch coat is a base layer of cementitious material that is literally scratched horizontally with a comb-like tool.

Wood-sheathed buildings are a different matter. Wood sheathing itself will not provide a proper base for stucco finish. So you need to layer it with Tyvek or other waterproof building paper, and then self-furring metal lath. This lath provides the grip for the scratch coat to hang onto. After the scratch coat, apply a brown coat to provide a smooth surface for the subsequent stucco finish.

Recommended thickness for the scratch coat for either masonry or wood-sheathed buildings is 3/8" minimum.

Stucco Pros and Cons

For decades, stucco was the finish-of-choice for contractors and builders throughout the Western U.S. After the 1980s, it fell out of favor. Is stucco ready for its come-back?

Pros

  • Can be textured as well as tinted.
  • Gives house a tight seal against weather.
  • Low-cost compared to other sides of siding.
  • Low-cost also interpreted by many homeowners and potential buyers as "sub-standard."
Cons
  • Not for every locality. Best suited for southwestern U.S. areas.
  • Repair of stucco finish not easy.
  • Do-it-yourself opportunities with stucco finish limited.
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