What is the recommended spacing for under boards in board and batten siding?

The recommended spacing for under boards in board and batten siding is 1/2 inch. This spacing allows for adequate ventilation and movement due to weather changes, which is crucial in maintaining the integrity and durability of the siding. The 1/2 inch gap prevents moisture buildup that can lead to rot or damage over time, especially in climates that experience significant fluctuations in temperature and humidity.

Additionally, having enough space ensures that the boards can expand and contract without causing warping or buckling in the siding material. Proper spacing is essential for the installation process, as it provides the necessary allowance for these natural movements while also maintaining a visually appealing layout for the board and batten design.

Other smaller gaps or no gap could potentially lead to issues, as they may not accommodate the necessary expansion and could trap moisture, leading to long-term problems with the siding's performance and aesthetics.