Your Guide to Identifying Different Types of Cracks in Stucco

Stucco is known for its durability, but it’s not immune to damage. Cracks are a common problem with stucco siding, and being able to identify the different types of cracks in stucco can help you know what action you need to take and how soon.

In this blog, we’ll provide a quick guide to some of the most common types of cracks in stucco and what their main causes are.

1. Hairline Cracks: Hairline cracks are extremely thin and are generally cosmetic, meaning they don’t typically extend deep into the stucco. They are often caused by the natural curling process of the stucco, minor shrinkage, or excess surface tension. In general, hairline cracks are cosmetic and don’t require immediate attention, but they should still be investigated by a professional who can ensure they’re not hiding a more substantial issue.
2. Spider Cracks: These cracks form a network of interconnected thin cracks on the stucco surface, much like a spider’s web. Spider cracks in stucco are often the result of minor structural shifting, temperature changes, or shrinkage. These cracks are mostly cosmetic and don’t usually indicate a deeper problem, but you should still have them assessed by a professional.
3. Map Cracks: Map cracks in stucco are often compared to puzzle pieces – they interlock and are usually more extensive than hairline or spider cracks. Because map cracks are often caused by settling or structural stress, they are cause for more concern than the previous cracks. Although they don’t always indicate a major problem, they can let excess moisture in, which will only exacerbate the problem, so you should have them checked out as soon as possible.
4. Structural Cracks: These cracks are often wider and deeper than other types of cracks in stucco and are typically found at the base of the exterior walls. They extend into the substrate and are a sign of a more serious issue with the building’s structure. These types of cracks should be assessed by a professional as soon as possible since they can let in moisture and indicate a serious issue with the foundation of the building.