Stucco is a beautiful and durable exterior cladding, but its longevity depends heavily on proper installation. One crucial aspect often overlooked is the correct application of furring nails. These seemingly insignificant fasteners are vital for creating the necessary air gap between the sheathing and the stucco, preventing moisture damage and ensuring a long-lasting, aesthetically pleasing finish. This guide details the proper nailing schedule for stucco furring nails, addressing common questions and offering expert advice.
What are Stucco Furring Nails Used For?
Stucco furring nails are specifically designed to secure furring strips—thin wooden or metal strips—to the underlying sheathing of a building's exterior. These strips create a crucial air space between the sheathing and the stucco, allowing for proper ventilation and preventing moisture buildup. Moisture is the enemy of stucco, leading to cracking, peeling, and even structural damage. By creating this air gap, furring strips and their accompanying nails dramatically extend the life of your stucco.
What is the Proper Nailing Schedule for Stucco Furring Strips?
The ideal nailing schedule depends on several factors, including the type of furring strip material (wood or metal), the strip's dimensions, and the type of sheathing. However, some general guidelines ensure a secure and effective installation:
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Spacing: Furring strips are typically spaced 12 to 24 inches apart, both horizontally and vertically, depending on the anticipated load and local building codes. Closer spacing may be required in areas with high wind loads or for larger stucco applications.
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Nail Type and Size: Galvanized nails are essential to resist corrosion. The size of the nails will depend on the thickness of the furring strip and the sheathing. Consult local building codes and the manufacturer’s recommendations for the appropriate nail size and type. Generally, nails should be long enough to penetrate the furring strip and adequately secure it to the sheathing, with a minimum of one inch penetration into the sheathing material.
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Number of Nails per Strip: Each furring strip should be secured with at least two nails per linear foot. More nails may be necessary depending on the strip's length, material, and the wind loading conditions. Nails should be evenly spaced along the length of the strip.
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Nail Placement: Nails should be driven straight and at a slight angle to avoid splitting the furring strip. They should be driven just enough to set the strip firmly but not so deeply that they cause damage.
Example: For a standard 1x2 inch wooden furring strip on plywood sheathing, a common practice is to use 1 ½ inch galvanized nails, with two nails per linear foot, evenly spaced.
How Many Nails Per Square Foot for Stucco Furring?
This question is tricky because it depends heavily on the spacing of the furring strips. Focusing on nails per strip rather than per square foot provides a more accurate and reliable approach to proper installation. Ensure that each furring strip is adequately secured, rather than trying to calculate a precise number of nails per square foot. Over-nailing can be just as damaging as under-nailing.
What Happens if You Don't Use Enough Nails?
Insufficient nailing results in several critical problems:
- Furring strip movement: Loose strips can shift, leading to uneven stucco application and cracking.
- Stucco cracking: Uneven surfaces can cause stress on the stucco, leading to cracking and potential water infiltration.
- Stucco failure: In extreme cases, poorly secured furring strips can lead to complete stucco failure, requiring costly repairs.
What Type of Nails Should I Use for Stucco Furring?
As mentioned earlier, galvanized nails are crucial. Galvanization provides corrosion resistance, preventing rust that could weaken the fasteners and damage the stucco over time. The exact size and type of galvanized nails will depend on the specific application and should be chosen based on the furring strip material and thickness, and the sheathing material. Always consult local building codes and manufacturer recommendations for specific guidance.
How Deep Should Stucco Furring Nails Be Driven?
The nails should be driven deep enough to secure the furring strip firmly to the sheathing without splitting the wood. Aim for at least one inch of penetration into the sheathing material. If the nail goes in too easily, it may indicate the nail is too short; if it's difficult to drive, it might be hitting a knot in the wood—try a slightly different placement.
By following these guidelines and paying close attention to detail, you can ensure the proper installation of stucco furring nails, creating a strong, durable, and long-lasting stucco finish that will protect your building for years to come. Remember to always consult local building codes and manufacturers' specifications for your specific materials and project.
