This page discusses installation methods required for installing a Warmup heating system under a floating wood floor.
Installation Heater
This page explains why Warmup does not recommend you cut the wire for any reason and provides solutions to having too much cable.
Instead, try pulling the cable off the mesh and spacing the cable every 2 or 2.5 inches apart. Consult your installation manual with further questions regarding where the cable or mat can be run.
While you must NEVER cut the wire, the mat system is designed to allow you to separate the wire from the mesh. The unusable mesh can be cut away from the mat. Now that you have freed the wire, you can install the wire around the area using hot-glue or tape to secure the cable away from any drains or screw-mounts.
If it is not installed in the floor, the joint may give and your system will no longer work. Not only will your warranty be voided but you will have to repair the joint and place it back into the floor. The joint connects the heated wire to the unheated lead. NEVER leave the factory joint exposed to air and do not place it in or behind the wall.