How to Retrofit Radiant Heat | This Old House

This Old House plumbing and heating expert Richard Trethewey shares tips for installing new radiant-heat tubing on top of an old subfloor when there's no access from below.

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Cost: About $10-$15 per square foot, plus mechanical component costs
Time: 2-4 days for an average-size room
Skill level: Somewhat easy, but connecting the radiant tubing to the boiler must be done by a pro

Shopping List for How to Retrofit Radiant Heat:
- radiant-heat panels used to hold PEX tubing in place in subfloor
- 1 5/8-inch drywall screws for fastening down the radiant-heat panels

Tools for How to Retrofit Radiant Heat:
- drill, for boring holes and driving screws
- rubber mallet, used to tap the PEX tubing into the grooves in the radiant-heat panels

Steps:
1. Fasten the plywood-backed radiant-heat panels to the subfloor with 1⅝-in. screws.
2. Stretch a continuous length of PEX tubing back and forth across the floor.
3. Use a rubber mallet to tap the tubing into the grooves of the radiant-heat panels.
4. Run the tubing ends down through the floor to the boiler.
5. Mount the manifold to a wall near the boiler, then connect the tubing ends to the manifold.
6. Run piping from the boiler to the manifold.
7. Install finish flooring over the tubing.

About Ask This Old House TV:
Homeowners have a virtual truckload of questions for us on smaller projects, and we're ready to answer. Ask This Old House solves the steady stream of home improvement problems faced by our viewers—and we make house calls! Ask This Old House features some familiar faces from This Old House, including Kevin O'Connor, general contractor Tom Silva, plumbing and heating expert Richard Trethewey, and landscape contractor Roger Cook.

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How to Retrofit Radiant Heat | This Old House
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