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// CODE SNIPPET

1217.5 Poured Floor Structural Concrete Slab Systems (Thermal Mass)

California Mechanical Code 2019 > 12 Hydronics > 1217.0 Radiant Heating and Cooling > 1217.5 Poured Floor Structural Concrete Slab Systems (Thermal Mass)
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Where tubing is embedded in a structural concrete slab such tubes shall not be larger in outside dimension than one-third of the overall thickness of the slab and shall be spaced not less than three diameters on center except within 10 feet (3048 mm) of the distribution manifold. The top of the tubing shall be embedded in the slab not less than 2 inches (51 mm) below the surface.

1217.5.1 Slab Penetration Tube and Joint Protection

Where embedded in or installed under a concrete slab, tubing shall be protected from damage at penetrations of the slab with protective sleeving approved by the tubing manufacturer. The space between the tubing and sleeve shall be sealed with an approved sealant compatible with the tubing. The tubing at the location of an expansion joint in a concrete slab shall be encased in protective pipe sleeving that covers the tubing not less than 12 inches (305 mm) on either side of the expansion joint or the tubing shall be installed below the slab.

1217.5.2 Insulation

Where a poured concrete radiant floor system is installed in contact with the soil, insulation approved for such an application with a minimum R-value of 5 shall be placed between the soil and the concrete; extend to the outside edges of the concrete; and be placed on all slab edges.

[HCD 1 & HCD 2] See California Energy Code Section 110.8(g) for insulation requirements for heated slab floors.

1217.5.3 Joist Systems and Subfloors

Where tubing is installed below a subfloor, the tube spacing shall be in accordance with the system design and joist space limitations.

     Where tubing is installed above or in the subfloor, the tube spacing shall not exceed 12 inches (305 mm) center-to-center for living areas.

     Where tubing is installed in the joist cavity, the cavity shall be insulated with not less than R-12 material below the heated space.

     An air space of not less than 1 inch (25.4 mm) and not more than 3 inches (76 mm) shall be maintained between the top of the insulation and the underside of the floor unless a conductive plate is installed in accordance with manufacturer's instructions.

     Where tubing is installed in panels above or in the subfloor and not embedded in concrete, the floor assembly shall be insulated with not less than R-5 material below the tubing when installed over habitable space.

1217.5.4 Wall and Ceiling Panels

Where piping is installed in the stud wall cavity or the ceiling joist cavity, the cavity shall be insulated with not less than R-12 material. The insulation shall be installed in such a manner as to prevent heating or cooling loss from the space intended to be controlled.

     An air space of not less than 1 inch (25.4 mm) and not more than 3 inches (76 mm) shall be maintained between the insulation and the interior surface of the panel unless a conductive plate is installed.

[HCD 1 & HCD 2] See California Energy Code Sections 150.0(j)2 and 120.3(c) for pipe insulation requirements based on pipe diameter.

Related Code Sections


1217.5 Hydronics, Poured Floor Structural Concrete Slab Systems (Thermal Mass)
Where a poured concrete radiant floor system is installed in contact ...
California Mechanical Code 2019 > 12 Hydronics > 1217.0 Radiant Heating and Cooling > 1217.5 Poured Floor Structural Concrete Slab Systems (Thermal Mass)
1217.6 Hydronics, Poured Floor Systems (Thermal Mass)
of the concrete; and be placed on all slab edges.     Where a poured concrete radiant floor system is installed on grade, not less than R-5 ...
California Mechanical Code 2016 > 12 Hydronics > 1217.0 Radiant Heating and Cooling > 1217.6 Poured Floor Systems (Thermal Mass)
1217.6.1 Hydronics, Slab Penetration Tube and Joint Protection
Where embedded in or installed under a concrete slab, tubing shall be protected from damage at penetrations of the slab with a protective pipe sleeve ...
California Mechanical Code 2016 > 12 Hydronics > 1217.0 Radiant Heating and Cooling > 1217.6 Poured Floor Systems (Thermal Mass) > 1217.6.1 Slab Penetration Tube and Joint Protection
1220.3.2 Hydronics, Poured Concrete Slab Systems (Thermal Mass)
Where tubes are embedded in a concrete slab, such tubes shall not be larger in outside dimension than one-third of the overall thickness of the slab ...
California Mechanical Code 2016 > 12 Hydronics > 1220.0 Auxiliary Systems > 1220.3 Snow Melt > 1220.3.2 Poured Concrete Slab Systems (Thermal Mass)
1220.2.2 Hydronics, Poured Concrete Slab Systems (Thermal Mass)
Where tubes are embedded in a concrete slab, such tubes shall not be larger in outside dimension than one-third of the overall thickness of the slab ...
California Mechanical Code 2019 > 12 Hydronics > 1220.0 Auxiliary Systems > 1220.2 Snow and Ice Melt Controls > 1220.2.2 Poured Concrete Slab Systems (Thermal Mass)
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