Heating mat started by the thermostat location, after 60" rolling down, mat will be turned up for another 60". Then heating mat will be slightly turned to the right and after four rows mat will be transferred to the edge of vanity. The rest of heating mat will have to be free from mesh and installed at 3" spacing using hot glue or HVAC tape to secure it to subfloor.
HTMATKIT-120-40: 20" wide x 24.4ft long heating mat is the best size for complete coverage.