What is the recommended number of nails per wood shingle for proper installation?

The recommended number of nails per wood shingle for proper installation is two nails per shingle. This practice is advised to ensure adequate holding power, which is crucial for the longevity and stability of the roofing material. Using two nails allows for better resistance against wind uplift and helps the shingle lay flat, thus minimizing the potential for water infiltration. It also distributes the load more evenly across the surface of the shingle, reducing stress on any single point.

Having only one nail may not provide sufficient anchorage, leaving the shingles vulnerable to displacement in adverse weather. Conversely, using three or more nails might be unnecessary and can potentially lead to issues like splitting the shingles or creating additional holes that might let water in, which can compromise the roof's integrity. Limitations on the number of nails also align with standard building practices that emphasize efficiency while ensuring reliability and safety in roofing installations. Thus, two nails are considered the optimal choice for effective wood shingle installation.