MasterHeat Heated Flooring




Electric Under-The-Floor Mats

Let MasterHEAT provide the accessories you need for your installation:

Under-The-Floor mats are the perfect solution for nearly every type of floor covering. These special mats warm existing floors without having to replace the floor coverings. If you have access under a floor, simply staple Under-The-Floor mats between the joists.

Under-The-Floor Mat RollThese effective, UL-Listed mats deliver 10 watts/sq. ft. of floor area (about 34 TU/hr/sq.ft.). Under-The-Floor mats will warm wood, vinyl, laminates, or tile floor coverings. With Under-The-Floor mats, most floors can be heated up to 12° to 15°F warmer than they would otherwise be.

Carpeted floors will not warm up as much as other floor coverings due to the high insulation value of carpet and padding. You may experience a temperature rise in the floor of only a 6°–10°F, which may or may not meet your satisfaction. Insulation installed below the mats is essential to complete the installation.

Consider these benefits of Under-The-Floor mats:

  1. Easy staple-up installation between floor joists.
  2. Manufactured in nearly 40 different lengths in 12” and 16” widths. Mats of any size (same voltage) may be combined to heat any type of room.
  3. 120-VAC and 240-VAC models for small to large projects.
  4. Highest-quality heating wire using Aramid reinforcing, ETFE high-temperature insulation, and oxygen-free copper alloys for corrosion-resistance, temperature-resistance, abrasion-resistance, and longevity.
  5. Shielded and fully grounded 10-ft. power lead for safety and jobsite durability (longer lengths available on request). Power leads are color-coded for 120 VAC and for 240 VAC.

Caution: Do not install Under-The-Floor mats in mortar or cement, or install them in the same control zone as MasterHeat mats or MasterHeat cables. These products have different heat output, and are manufactured for different applications.

Easily Staple MasterHeat mats under the floor
connect mats at junction box
install insulation
12 inch wide mats
16 inch wide mats

Sample Kitchen Layout

Sample Kitchen Layout Using Under-The-Floor Mats

Each Under-The-Floor mat is designed to be installed in only one joist bay. The mats cannot be cut shorter to fit a shorter joist bay or modified in any way to fill multiple joist bays. However, more than one mat may be installed in a joist bay where there are barriers such as cross bracing or blocking.
In this kitchen layout, four 9.5’ x 16” and eight 4’ x 16” mats are required to warm the floor area. The mats are wired together in parallel (not in series) at junction boxes below the floor, then electrical wire is fed over to the FloorStat control.
Select mats for the easiest wiring possible. If all the power leads end up at one end of the room, it will be much easier to wire them together in the junction boxes. Junction boxes must be accessible after all finishing work is completed.

*See our MasterHEAT Pricing page for itemization & ordering information

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