Install a Heated Wood Floor
Best Practices: Installing the Warmup Radiant Heat Cables
Several flooring manufacturers have tested their products specifically with Warmup products and certified their warranties on combined installations. This list includes Amorim, Wicanders, and Higuera Hardwoods, among others.
- Use 1/4-in. or 3/8-in. sleepers so that filling the voids with leveler will give you an effective heat bank, yet only minimally raise floors.
- Using the standard 10-in. spacing for 3-in. wide sleeper runs, we spaced three runs of cable (spaced at 2”, 5” and 8”) in each sleeper gap.
Note: Depending on your specific conditions, you may need to adjust sleeper spacing to accommodate the support of the wood floor.
- For installations over concrete and/or requiring insulation, a variant of the sleeper method is to use 2×3’s or 2×4’s partly embedded in the slab pour. This allows for insulation to be included and more thermal mass to be poured between the sleepers. Warmup’s regular NADWS floor heating or WODH slab heating cables can be used in these applications.
Encapsulating the Radiant Heat Wires
Once the cables are in, pour concrete between the sleepers. This creates a thin radiant slab that encases the cables. In all cases, a layer of insulation is normally placed below the existing subfloor to ensure that most of the heat is directed upward.
I used latex-modified thinset (LMT), which is a blend of cement, very finely graded sand, and a water-retention compound that allows the cement to properly hydrate. LMT is cheaper than a self-leveling pour, which is frankly not needed in this situation.