Why should the grooved edge of flooring be positioned nearest to the end wall?

Positioning the grooved edge of flooring nearest to the end wall is primarily important for proper expansion and contraction. Wood flooring, including engineered and solid hardwood types, expands and contracts in response to changes in temperature and humidity.

When the grooved edge is placed against the wall, it allows for the natural movement of the flooring. The ends of the planks are more prone to movement than the sides, particularly as changes in moisture levels affect the wood. This placement minimizes potential issues such as warping or buckling that could occur if there were inadequate space for expansion when the flooring expands.

Therefore, ensuring that the grooved edge faces the wall helps maintain the integrity of the installation over time, allowing for a more stable and durable floor. Other considerations, while they may have some relevance, do not address the fundamental need for allowing the flooring to adapt properly to environmental changes in a way that protects the structure and aesthetic of the floor.