
Stucco tips all Arizona homeowners should know
Stucco is a widely used exterior finish for homes in Arizona. This article, featuring insights from Doug Dedrick of Stucco Renovations of Arizona, LLC, details the various stucco systems, finishing options, decorative features, and repair methods. Understanding these aspects is crucial for Arizona homeowners to maintain their homes effectively.
The three-coat stucco system is a traditional method involving three cementitious layers applied over a paper-backed lath on a solid substrate. The initial scratch coat is intentionally rough to ensure adhesion for the subsequent brown coat, which is smoother. The final finish coat, where texturing is applied, follows after the brown coat cures. A notable characteristic of cementitious stucco products is their propensity to crack. However, the three-coat system allows these cracks to form in the underlying layers, making repairs simpler and reducing the likelihood of cracks appearing in the visible finish coat.
The one-coat stucco system, also known as a “Western one-coat,” is a more prevalent option. Despite its name, it consists of two cementitious coats—a combined scratch and brown coat—that incorporate fibers, proprietary chemicals, and water, applied over a metal mesh on rigid foam sheathing. Similar to the three-coat system, the base coat needs to dry and any cracks must be mended before the finish coat is applied.
The Exterior Insulation Finishing System (EIFS) is another system, though less common in residential applications due to its higher cost compared to traditional stucco and potential issues with moisture entrapment within home framing. This polymer-based, stucco-like finish is applied to thick foam insulation and is more frequently seen in commercial construction where moisture dissipation methods are integrated into the building design. Stucco manufacturers often include fibers and polymers in their mixes to minimize cracking, though complete elimination of cracks is not guaranteed.
The article also discusses stucco finishes, which vary significantly. In Arizona, smoother finishes are less popular due to their tendency to highlight minor cracks. A coarser sand finish is more common, as it helps obscure hairline cracks and complements contemporary home designs. Applicators may have proprietary or regional finishes, such as “River Sand,” “Random,” “Skip Trowel,” or “Spanish Lace.” Another finish, "Cat Face" or "Santa Fe," features a smooth surface with small rough patches. Homeowners are advised to examine tactile samples rather than relying solely on images when selecting a finish.
Decorative features like cornices around windows, doorways, and arches are also discussed. These elements, which can enhance a home's aesthetic, must be securely wired to the base lath system to prevent separation or cracking. The use of expansion joints can further mitigate cracking by accommodating the stucco system's natural expansion and contraction.
Regarding repairs, a fundamental principle in construction is that concrete, including stucco, will crack. For cracks, homeowners should assess their location, size, and direction. Cracks wider than 1/8-inch, those where surfaces are misaligned, or wide cracks at a 45-degree angle from an opening, may indicate structural issues requiring professional assessment. For non-structural cracks, the repair process involves cleaning the crack of debris, selecting an appropriate caulk (sand caulk is recommended for texture matching), filling the crack, and then painting. Often, the entire wall may need refinishing to ensure a consistent appearance. The article concludes by touching upon industry training for stucco workers, highlighting both on-the-job experience and essential safety training, particularly scaffolding and heat safety in Arizona's climate.
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