WarmlyYours TempZone Floor Heating Cable (Twin) - Manual (Page 7)

Planning the Installation SECTION 3
4
3.1 Selection of Floor Covering material
The floor covering materials used with this product must not exceed a thermal insulation R-value of 1.
Examples of Common R-values for Floor Covering Materials*
Floor Covering Material Thickness (inches) R-value
Carpet 3/8 1.0
Tile (ceramic, mosaic) 1/4 0.15
Laminate 3/8 0.675
Plywood ½ 0.63
Natural stone (granite,
limestone, marble, sandstone)
1 0.38 to 0.114
Wood 3/4 0.80 maximum
*These values are provided for general reference purposes only. Consult the floor covering manufacturer for product-specific
information.
3.2 Thermal Insulation
The insulation levels of the floor will affect both the performance and operating costs of the TempZone™ floor heating
system. Thermal insulation reflects the heat upwards into the floor tile instead of allowing heat to penetrate into the
subfloor, keeping the floor warmer for a longer time.
When the cable is installed on a concrete slab, we recommend adding a layer of insulation to the slab prior to installing
the TempZone™ Floor Heating Cable (Twin). Adding insulation on top of the concrete slab and beneath any floor heating
system will allow a greater percentage of heat generated to transfer to the flooring surface. WarmlyYours recommends
using 5 mm thick CeraZorb® synthetic cork underlayment.
3.3 Calculation of Length of Cable Required
To determine the appropriate cable length for the installation, measure the area to be heated and calculate the area in
square feet. Do not include the area covered by fixed objects, such as appliances, bathtubs, cabinets, etc. Refer to the
“Installation and Spacing Recommendations” chart in section 1.2 to determine the recommended watt density per square
foot for the type of installation. Refer to “Product Selection Guide--120V” or “Product Selection Guide--240V” in section 9 to
select appropriate cable length.