The Ideal Underlayment for Electric or Hot Water Radiant Floor Heating Systems
from Maxxon™, the floor specialists.

Preparation: Building  interior should be enclosed and maintained at a temperature above 50ºF (10º C) until structure and subfloor temperatures are stabilized. Preferred woodframe construction is tongue-and-grove veneer or nonveneer subfloors. The subfloor must be broom clean and contaminant free. Before pouring Therma-Floor, the subfloor is coated with a company approved primer.

Methods of Installation: The thickness of Therma-Floor varies with the type of radiant floor heating system. Therma-Floor is poured to a depth that is ¾" (19mm) above the tops of the tubes or cables. Therma-Floor may be installed over polystyrene laminated to ¼" (6mm) [minimum] veneer or nonveneer wood sheathing. Use extruded polystyrene with a minimum density of 1.6 pcf (25.6 kg/m³) [Type IV], or expanded polystyrene with a minimum density of 1.8 pcf (28.8kg/m³) [Type IX]. Both types meeting ASTM C 578. Polystyrene may be fastened down by adhesives, mechanical fasteners or a Therma-Floor slurry.

Continuous ventilation and adequate heat should be provided to rapidly remove moisture from the area until the underlayment is dry. The general contractor must supply mechanical ventilation and heat, if necessary. under the above conditions, drying time of 5 to 7 days is usually adequate. For a complimentary copy of the brochure, Procedures for Attaching Finished Floor Goods, contact Maxxon Corporation.

 
Lightweight Therma-Floor encases tubes
or electric cables in a crack-resistant
layer of noncombustible gypsum.
 

Limitations: 

1. Therma-Floor is to be poured to a depth that is ¾" (19mm) above the tops of the tubes or cables.

2. Therma-Floor can be poured before or after drywall is installed.

3. All materials above crawl spaces must be protected by a vapor barrier.

4. During construction, place temporary wood planking over the underlayment wherever it will be subjected to heavy wheeled or concentrated loads.

5. Therma-Floor is not designed to be installed on or below grade, except over well-drained structural substrates.

6. The structural floor should be adequate to withstand design loads with a deflection limitation of L360.

7. Therma-Floor should not be used directly over metal forms, for exterior application, or where it will come in prolonged contact with water.

8. Therma-Floor should not be applied directly to a plastic vapor barrier.

Code Listings:
ICBO #3433, BOCA #90-31.
Contact Maxxon Corporation for major city approvals.

Product Support:
Additional product literature, CSI formatted specifications and information are available upon request.

Testing: Compressive strength testing must be performed in accordance with modified ASTM C 472. Before independent sampling, contact the Maxxon Corporation quality control department to ensure that proper procedures are followed.

Warranty: Maxxon Corporation warrants Therma-Floor Underlayment to be free from manufacturing defects as defined in this warranty. Manufacturing defects are considered to be those defects that occur due to the quality of the Therma-Floor ingredients or from the manufacturing process itself. This warranty does not include labor costs and other costs or expenses associated with the removal or installation of Therma-Floor.

Because the Maxxon Corporation does not perform the actual Therma-Floor installation, it cannot be held responsible for the results of the application. Maxxon Corporation specifically disclaims problems that occur due to weather conditions, structural movement, structural design flaws and application techniques.

This warranty is in lieu of all other warranties expressed or implied including the warranty of merchantability and fitness of purpose and of all other obligations or liabilities on Maxxon Corporation's part. Maxxon Corporation neither assumes nor authorizes any person to assume for Maxxon Corporation any liability in connection with the sale and installation of Therma-Floor.

Technical Data
Compressive Strengths: up to 2,500psi (17.2MPa) when tested in accordance with modified ASTM C 472.

Point Loading: Typical loading of up to 2,000 pounds (910 kg) on a 1" (25mm) diameter disc.

Density: Typical density of 115 pounds per cubic foot (1,840 kg/m³).

Thermal Resistance at 1-inch Thickness: R-0.208

Coefficient of Conductivity (K): 4.96 Btu/(h•ft²•°F) (.7142 W/[m•ºC])

Specific Heat: .224 Btu/(lb•ºF) at 85ºF (.9385 kJ[kg•ºC] at 29.44 ºC)

Acoustical Performance: The acoustical performance of Therma-Floor is similar to Gyp-Crete® Floor Underlayment. Contact Maxxon Corporation for reports.

Fire Ratings: Contact Maxxon Corporation for Underwriters Laboratories fire ratings.

Surface Burning Characteristics: Flame spread index - 0, fuel contributed -0, smoke development - 0. (ASTM 84)