Stucco is a beautiful and durable exterior cladding, but its longevity and aesthetic appeal depend heavily on proper installation. A crucial step often overlooked is the correct application of furring nails. These aren't just any nails; they create the necessary air gap between the sheathing and the stucco, preventing moisture damage and improving the overall performance of your stucco system. Getting the nailing schedule right is critical for success. This comprehensive guide will delve into the specifics, answering common questions and ensuring your stucco project stands the test of time.
What are Stucco Furring Nails?
Stucco furring nails are specialized nails designed to securely fasten furring strips—thin pieces of wood or metal—to the building's sheathing. These strips create a crucial air space between the sheathing and the stucco, allowing for proper ventilation and preventing moisture buildup, which is a major cause of stucco failure. The nails themselves need to be corrosion-resistant, typically galvanized or stainless steel, to withstand the elements.
What is the Proper Spacing for Stucco Furring Nails?
The proper spacing of stucco furring nails depends on several factors, including the type of furring strip (wood or metal), the strip's thickness, and local building codes. However, some general guidelines apply:
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Wood Furring Strips: Generally, you'll want to space nails approximately 6-8 inches apart along the length of the strip, and every 6 inches at the ends. This spacing provides sufficient holding power without overdriving the nails and causing damage.
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Metal Furring Strips: Metal furring strips often have pre-punched holes, dictating the nailing pattern. Always follow the manufacturer's recommendations for spacing and nail type. However, similar spacing to wood furring strips is typical if not specified.
Important Note: Regardless of the material, nails should be driven straight and fully seated to ensure a secure connection. Overdriving can split the furring strip, compromising its integrity.
How Many Nails Per Furring Strip?
The number of nails per furring strip will vary depending on the length of the strip and the spacing guidelines mentioned above. Always err on the side of caution and use enough nails to provide ample support. Under-nailing is a common cause of stucco failure and can lead to costly repairs. A good rule of thumb is to visually inspect and ensure each strip is adequately supported for its length, considering the potential for wind uplift.
What Happens if You Don't Use Enough Stucco Furring Nails?
Insufficient nailing can lead to a variety of problems, including:
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Sagging Furring Strips: Insufficient support causes the furring strips to sag, creating an uneven surface for the stucco application. This results in an aesthetically unpleasing finish and can compromise the integrity of the stucco system.
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Stucco Cracking: An uneven surface created by sagging furring strips can lead to stress points in the stucco, causing cracking and other damage.
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Moisture Buildup: Gaps between the furring strips and the sheathing allow moisture to penetrate the wall assembly, leading to rot, mold, and other structural damage.
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Wind Uplift: Inadequate nailing can make the entire furring system vulnerable to wind uplift, potentially causing significant damage to the stucco and underlying structure.
What Type of Nails Should I Use for Stucco Furring?
Use galvanized or stainless steel nails specifically designed for exterior applications. Common nail sizes range from 8d to 10d, but the optimal size depends on the thickness of the furring strips and the sheathing material. Always consult local building codes and manufacturer's recommendations for specific nail requirements. Avoid using nails that are too short, as they may not provide adequate holding power, and avoid using nails that are too long, as they may penetrate the sheathing and cause damage.
How do I ensure proper nailing when installing stucco furring?
Careful planning and execution are key. Begin by ensuring the furring strips are straight and level before nailing. Use a nail gun for consistent penetration and avoid damaging the wood. Check your work regularly to maintain consistent spacing and ensure every strip is adequately secured. A final inspection after nailing is complete is recommended to catch any missed areas before proceeding to the stucco application.
By following these guidelines and paying attention to detail, you can ensure a strong, long-lasting, and aesthetically pleasing stucco finish. Remember, proper nailing of furring strips is a crucial step, and cutting corners can lead to significant problems down the line. Always refer to local building codes and manufacturer's instructions for specific requirements.
