If I’m doing a full wall-to-wall installation, how much space do I need to leave around the perimeter?

When rolling out G‑Floor, be certain to leave at least an inch of space from the edge of the mat to a wall or any heavy object like a cabinet or tool box, to help prevent any buckling or wrinkles in the material due to movement of the pad if it is not secured to the floor in some manner.

https://bltllc.com/g-floor-installation-instructions/