When using wide square edge boards for board and batten siding, how should the batten strips be nailed?

When installing board and batten siding with wide square edge boards, the batten strips should be nailed to only one siding board. This approach allows for the necessary expansion and contraction of the siding materials due to temperature and humidity changes. By fastening the battens to one board, it enables that board to expand or contract independently from the other siding board, reducing the risk of cracking, splitting, or warping. It also helps maintain the aesthetic alignment of the batten strips over time, ensuring a clean and uniform appearance across the finished surface.

In contrast, nailing the batten strips to both siding boards would restrict movement and could lead to structural issues as the materials respond to environmental conditions. Nailing to the studs can be too rigid and does not provide the flexibility required for the siding's movement. Nailing to the bottom edge of the siding is not a typical practice, as it does not offer the desired support or appearance for the batten strips.