Nails used for installing Hardboard panel siding vertically must penetrate the framing by a minimum of how much?

For installing Hardboard panel siding vertically, the correct nail penetration into the framing is a minimum of 1-1/2 inches. This requirement is in place to ensure that the siding is securely anchored to the structure, providing stability and strength against wind loads and other forces that the siding may face. Adequate penetration helps prevent issues such as lifting or loosening of the panels, which can lead to water intrusion and degradation over time.

This specific measurement is designed to accommodate various framing materials and methods, ensuring that the nails reach deep enough into the framing members to create a reliable connection. It's essential for contractors to adhere to these standards as specified in building codes to ensure structural integrity and longevity of the siding installation.