Lath Installation: The Foundation of Long-Lasting Stucco
At Stucco Champions, we believe that every great stucco finish begins with what lies beneath — and that’s lath. Often overlooked by property owners, lath installation is one of the most important steps in building a stucco system that not only looks beautiful but also lasts for decades.
Whether you’re managing a new build or restoring an exterior, understanding lath can help you make informed decisions that protect your investment.
What Is Lath in Stucco?
Lath is a structural base — typically made from metal mesh and moisture-resistant paper — that’s fastened to a building’s surface before stucco is applied. This layered foundation gives stucco something to grip onto and forms a drainage plane that protects the structure from moisture damage.
Types of Lath We Use:
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Expanded metal lath for strength and flexibility
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Two layers of Grade D building paper for proper moisture control
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Weep screeds and corner aids to promote drainage and edge durability
When installed correctly, these components work together to ensure a solid and breathable foundation for your stucco system.
Why Lath Installation Matters
1. Structural Integrity
Lath creates the backbone that supports every layer of stucco. If installed poorly, the entire system can fail — leading to cracks, bubbling, and even detachment from the wall.
2. Moisture Protection
Our two-layer paper method forms a drainage plane that keeps moisture from seeping into the home’s framing or sheathing. This is especially crucial in California’s varied climates, where temperature shifts and rain can compromise improperly sealed systems.
3. Better Bonding
A tightly installed lath allows the scratch coat to bond properly. This improves curing and reduces the likelihood of cracking or uneven drying.
4. Fire and Pest Resistance
When combined with proper stucco layers, lath systems improve fire resistance and reduce opportunities for pest intrusion — two key concerns for California homeowners and builders.
Our Process at Stucco Champions
We don’t cut corners. Here’s what a professional lath installation looks like:
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Inspection and Surface Prep – We ensure the framing is sound and free from moisture issues.
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Paper Layering – Two layers of Grade D paper are installed with proper overlaps and fasteners.
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Metal Lath Application – We use high-quality expanded metal lath, fastened according to code and best practices.
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Accessories Installed – Including weep screeds, expansion joints, and corner aids for maximum durability.
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Quality Check – Every project goes through a thorough pre-scratch inspection.
Common Mistakes We Avoid
Too many contractors rush this phase, which leads to issues like:
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Improper lath overlap or sagging wire
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Inadequate fastening that leads to shifting
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Skipping or misplacing drainage components
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Leaving lath exposed to sun and moisture for too long before applying the scratch coat
At Stucco Champions, we’re not just following code — we’re following decades of experience. Our projects are built to stand the test of time, not just pass inspection.
Final Thoughts
If you’re investing in stucco, don’t overlook the step that makes everything else possible. Whether it’s a residential home or commercial building, proper lath installation is the hidden strength behind a flawless exterior.
Ready to Simplify Your Stucco Work?
Contact Stucco Champions today for a free consultation!
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