When installing board paneling, what angle should the first board be undercut?

When installing board paneling, the first board should be undercut at an angle of 5 degrees. Undercutting the first board at this specific angle allows for the expansion and contraction of the wood, which can occur due to changes in humidity and temperature. This slight angle also helps to create a cleaner appearance at the edges, concealing any potential gaps that might arise over time.

By setting the first board at a 5-degree angle, it also facilitates a smoother installation process, ensuring that the subsequent boards align properly and sit flush against the wall. This technique enhances the overall stability and aesthetics of the paneling, making it an important practice in installation.

Choosing an angle that is too steep, such as 10 or 15 degrees, could complicate the installation and lead to more pronounced gaps or misalignment. An angle of 0 degrees would mean the board is not undercut at all, which may not provide the needed flexibility for contractions or expansions of the material. Thus, opting for 5 degrees strikes the right balance for both functionality and appearance.