Radiant floor heating is one of the most comfortable upgrades you can add to a home. But before you lay a single heating cable or mat, you need to choose the right subfloor because the material beneath your finish flooring will directly affect heat efficiency, durability, and installation success.
Plywood with Insulation Panels
Ideal for engineered wood, laminate, and some vinyl floors. The plywood provides stability, while foam or cork insulation boards beneath the heating element help direct warmth upward instead of letting it escape downward.
Cement Board
The go-to choice for tile installations. Cement board resists moisture, won’t rot, and offers a solid, even base that helps prevent cracked grout or tile. Pairing cement board with a thin thermal underlayment can improve heat transfer.
High-Density Foam Boards
Lightweight yet strong, these are perfect when you want to reduce thermal loss. Many foam boards come with built-in grooves for heating cables, making installation faster.
Key Tips for Success
Always check the compatibility of your subfloor with the specific radiant system brand.
Use the manufacturer’s recommended adhesive or fastener types to avoid damage.
Consider the final floor covering tile, wood, and vinyl each have unique requirements.
Remember this;
Choosing the right subfloor is like building a strong foundation for comfort get it right, and your heated floors will be warm, efficient, and long-lasting.
