What is the nail pattern for vertical and horizontal application of panel-type sheathing?

The correct nail pattern for vertical and horizontal application of panel-type sheathing is indeed based on applying nails securely to ensure the structural integrity of the sheathing. A nail spacing pattern of 6 inches on the edges and 12 inches elsewhere is commonly prescribed in construction guidelines.

This pattern is designed to provide adequate support to the panels, especially at the edges where they are more susceptible to movement and stress. The tighter spacing at the edges helps to prevent potential issues such as delamination or separation from the framing, while the wider spacing across the field of the panel is sufficient to maintain stability and resist shear forces.

The choice of 6 inches on the edges corresponds to standard practices in framing which require more density of fastening to maintain the assembly's strength. The 12 inches spacing in the field is enough to handle the load and secure the panels to the framing adequately.

Proper adherence to these nail patterns during installation is critical for ensuring the durability and structural performance of the building envelope.