June 16, 2021
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How to Install Electric Radiant Floors

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Tile Bathroom Floor
 asbe / Getty Images

Overview

  • Working Time: 6 – 8 hrs
  • Total Time: 2 – 3 days
  • Skill Level: Advanced
  • Estimated Cost: $500 to $1,000

The gentle warmth of electric radiant floors is always welcome underfoot on a chilly day. Radiant floor heating is so effective because it generates heat from electric cables and radiates that heat to solid, dense objects. These objects—subfloor, thinset mortar, and tile—help to evenly spread out the heat and to retain that heat for a long time.

For just a few cents a day, you can keep your flooring warm and toasty. Your radiant heated floor can even be a supplementary room heating source.

Installing Electric Radiant Floor Heating

Electric brilliant floor warming frameworks are worked from electric links that are run to and fro between link spacers. After the whole framework is laid and tried, a wet tile mortar called thinset is scooped straight ludicrous, with tile put on top and afterward grouted.

The cables are spaced around 3 or 4 inches apart from each other. Long plastic strips of plastic called cable spacers act as the end points for the cables. Attached to the subfloor, the cable spacers act both as secure anchors for the cable and as devices that maintain proper cable space.

Electric Floor Heating Mat Systems

A similar type of radiant floor heating is a mat system, where the cables are already spaced and attached to a flexible mat. The mat system is easy to install and works well for simple spaces with few angles. However, the cable-and-spacer system (this project) offers greater flexibility and is less expensive.

When to Install Electric Radiant Floors

Introducing electric brilliant floors should be done after the subfloor has been introduced and before the tile has been introduced. Brilliant warming frameworks’ links are forever installed in the wet thinset mortar. The tile is then laid on top of the thinset mortar.

Safety Considerations

Hire a licensed electrician to bring electricity to the start point of the cable run, to install the thermostat, and to make all of the splices. All work must be done in accordance with the National Electrical Code (NEC) and local building and electrical codes.

What You’ll Need

Equipment / Tools

  • Hot glue gun
  • Chalk snap line
  • Cordless drill
  • Tape measure
  • Pencil
  • Hammer
  • Square-notch trowel

Materials

  • Floor heating cables
  • Floor heating cable straps
  • Radiant heating underlayment
  • Electric floor heating thermostat
  • Cement backer board
  • Industrial-grade hot glue
  • High-temperature tape
  • Thinset mortar

Instructions

  1. Secure SubfloorCheck the subfloor to ensure it’s level. If you find any loose edges, use the cordless drill to screw down the edges. Drive the screws through the subfloor and into the floor joists.Screw Down Subfloorhttps://013a8158c9be7b853794d8fd83b1c244.safeframe.googlesyndication.com/safeframe/1-0-38/html/container.html
  2. Add Cement Backer BoardWith the cordless drill, drive screws through the cement backer board and into the subfloor.Add Cement Board
  3. Lay Radiant Heating UnderlaymentWith the square-notch trowel, trowel thinset mortar onto the subfloor. Lay the radiant heating underlayment into the thinset. Check the underlayment instructions for installation details, as some underlayments may not require a bed of thinset.Lay the Radiant Heating Underlayment
  4. Snap Chalk LineHammer two nails temporarily into the surface of the underlayment as anchors for the chalk snap line. Use the chalk snap line to create visual reference marks for installing the cable straps straight and evenly.Snap Chalk Line
  5. Glue Down Cable StrapsHeat up the glue gun by plugging it in. Run beads of hot glue along the chalk lines created earlier.Glue Track Down
  6. Lay Cable StrapsQuickly lay the cable straps in the hot glue before the glue hardens. Lay down only one strap at a time.Lay the Track
  7. Run Cables Between Cable StrapsBuild the primary link network by circling the floor warming links between two link lashes. Run the link to and fro, following the imprints on the link lashes, in a consistently dispersed serpentine example. Keep the links tight between the lashes however not so close as to pull the ties free.Run Wires Between TracksWarningFloor heating cables should never be cut. For this reason, be careful when you calculate the length of floor heating cable prior to purchase.
  8. Build Adjacent Cable GridsExpand the radiant floor heating by building additional cable grids. These grids can be as large or small as necessary to fill the spaces, as long as the system’s power output is sufficient.Attach Wires to TrackTipConsider purchasing a radiant floor heating installation monitor. This low-cost electronic device is helpful as it can detect if any of the cables are nicked, cut, or otherwise damaged during installation. For less than $25 or $30, this device can save you thousands of dollars by keeping you from having to remove the tile floor to repair the cable.
  9. Tape Down CablesUse the high-temperature tape to secure the cables to the underlayment. Do this about every 20 inches. This helps to keep the cables in position and parallel until the tile is installed.Tape Down Wires
  10. Connect Cables to Electrical SystemHave an electrician install the thermostat to a non-GFCI electric circuit. The electrician should splice the floor heating cable into the electrical cable that leads from the circuit—mindful of the fact that the splice will eventually be embedded in wet thinset mortar. The system should also be tested with an ohmmeter or multimeter.Connect the Wires
  11. Trowel Thinset Over CablesTrowel thinset mortar over the heating cables. Run the trowel in the direction of the cables. Be careful to avoid cutting, nicking, or disturbing the wires.While the thinset is still wet, install the tile in the thinset. After the thinset is fully cured, grout the seams.Trowel Thinset Over Wires

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