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Section M2103 Floor Heating Systems

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M2103.1 Piping Materials
Piping for embedment in concrete or gypsum materials shall be standard-weight steel pipe, copper and copper-alloy pipe and tubing, cross-linked polyethylene/aluminum/cross-linked polyethylene (PEX-AL-PEX) pressure pipe, chlorinated polyvinyl chloride (CPVC), cross-linked polyethylene (PEX) tubing, polyethylene of raised temperature (PE-RT) or polypropylene (PP) with a rating of not less than 80 pounds per square inch at 180°F (552 kPa at 82°C).
M2103.2 Thermal Barrier Required
Radiant floor heating systems shall have a thermal barrier in accordance with Sections M2103.2.1 and M2103.2.2. Insulation R-values for slab-on-grade and suspended floor installations shall be in accordance with Chapter 11.
Exception: Insulation shall not be required in engineered systems where it can be demonstrated that the insulation will decrease the efficiency or have a negative effect on the installation.
M2103.2.1 Thermal Break Required
A thermal break consisting of asphalt expansion joint materials or similar insulating materials shall be provided at a point where a heated slab meets a foundation wall or other conductive slab.
M2103.2.2 Thermal Barrier Material Marking
Insulating materials used in thermal barriers shall be installed so that the manufacturer's R-value mark is readily observable upon inspection.
M2103.3 Piping Joints
Copper and copper-alloy systems shall be soldered, brazed, or press connected. Soldering shall be in accordance with ASTM B828. Fluxes for soldering shall be in accordance with ASTM B813. Brazing fluxes shall be in accordance with AWS A5.31. Press-connect joints shall be in accordance with ASME B16.51. Piping joints that are embedded shall be installed in accordance with the following requirements:
  1. Steel pipe joints shall be welded.
  2. Copper tubing shall be joined by brazing complying with Section P3003.6.1.
  3. Polybutylene pipe and tubing joints shall be installed with socket-type heat-fused polybutylene fittings.
  4. CPVC tubing shall be joined using solvent cement joints.
  5. Polypropylene pipe and tubing joints shall be installed with socket-type heat-fused polypropylene fittings.
  6. Cross-linked polyethylene (PEX) tubing shall be joined using cold expansion, insert or compression fittings.
  7. Raised temperature polyethylene (PE-RT) tubing shall be joined using insert or compression fittings.
M2103.4 Testing
Piping or tubing to be embedded shall be tested by applying a hydrostatic pressure of not less than 100 psi (690 kPa). The pressure shall be maintained for 30 minutes, during which the joints shall be visually inspected for leaks.