Watts Radiant UnderFloor™ mats are the perfect solution for warming nearly every type of floor covering without having to tear it up. If you have access beneath the floor, simply staple UnderFloor mats between the joists. Most floors can be heated up to be warmer than they would otherwise be. However, carpeted floors may see a lower temperature increase due to the high insulation value of carpet and padding. Insulation installed below the mats is essential to complete the installation.
Unroll and staple mats into your joist bays, 2 inches from the subfloor. Remember, mats are designed to fit in just one bay at a time.
Mount junction boxes in accessible locations. Connect mats to power supply in parallel at junction boxes. Always follow electrical and building codes, using conduit and electrical boxes where needed. Limit 15 amps per thermostat.
After connecting your SunStat thermostat and testing the system, install R-11 to R-19 fiberglass batt insulation up to the mats. Also install insulation vertically at the ends of the joist bays or 6 inches after the mat ends.