Radiant Heat

2015-09-08 11.03.442015-09-08 11.03.44


LEVELROCK RH® is a gypsum underlayment engineered for rapid installation over hot water tubes or electric heating cables. It acts as the thermal mass for any infloor radiant system.



LEVELROCK RH® encapsulates the tubes or cables in crack resistant, noncombustible gypsum. This unique system resists breakdown to 150ºF (66ºC). And because it’s poured only 3/4″ above the tubes or cables typically 1 1/2″ thick, the heating system is more responsive and more comfortable.


Also offered in a “Green” formulation for LEED points, LEVELROCK is an ideal solution for sustainable building projects.

Compressive Strength: Compressive strength may be specified from 2,500 to 4,500 psi
‘K’ Factor: 4.96 Btu/(h­ · ft² · °F) (.7142 W/[m · °C])
Specific Heat: .224 Btu/(lb · ºF) at 85ºF
(.9385 kJ[kg · ºC] at 29.44ºC)
Weight: At 1″, 9.6 lbs./sq.ft.
Dry Density: 115 lbs./ft³ (1840 kg/m³)
Thermal Resistance at 1″ Thickness: R-0.208
Surface Burning Characteristics: Flame spread: 0
Fuel contributed: 0
Smoke density: 0

‘Green’ Information: Available upon request from LEVELROCK/USG