CODES

ADOPTS WITHOUT AMENDMENTS:

International Residential Code 2012 (IRC 2012)

Part I ‒ Administrative

Part II ‒ Definitions

Part III ‒ Building Planning and Construction

Part IV ‒ Energy Conservation

Part V ‒ Mechanical

Part VI ‒ Fuel Gas

Part VII Plumbing Administration

Part VIII ‒ Electrical

Part IX ‒ Referenced Standards

Hydronic piping shall conform to Table M2101.1. Approved piping, valves, fittings and connections shall be installed in accordance with the manufacturer's installation instructions. Pipe and fittings shall be rated for use at the operating temperature and pressure of the hydronic system. Used pipe, fittings, valves or other materials shall be free of foreign materials.

TABLE M2101.1
HYDRONIC PIPING MATERIALS

MATERIALUSE CODEaSTANDARDbJOINTSNOTES
Brass pipe1ASTM B 43Brazed, welded, threaded, mechanical and flanged fittings
Brass tubing1ASTM B 135Brazed, soldered and mechanical fittings
Chlorinated poly (vinyl chloride)
(CPVC) pipe and tubing
1, 2, 3ASTM D 2846Solvent cement joints, compression joints and threaded adapters
Copper pipe1ASTM B 42,
B 302
Brazed, soldered and mechanical fittings threaded, welded and flanged
Copper tubing (type K, L or M)1, 2ASTM B 75,
B 88, B 251,
B 306
Brazed, soldered and flared mechanical
fittings
Joints embedded in concrete
Cross-linked polyethylene (PEX)1, 2, 3ASTM F 876, F 877(See PEX fittings)Install in accordance with manufacturer's instructions
Cross-linked polyethylene/
aluminum/cross-linked
polyethylene-(PEX-AL-PEX)pressure pipe
1, 2ASTM F 1281 or
CAN/ CSA
B137.10
Mechanical, crimp/insertInstall in accordance with manufacturer's instructions
PEX fittings ASTM F 877
ASTM F 1807
ASTM F 1960
ASTM F 2098
ASTM F 2159
ASTM F 2735
Copper-crimp/insert fittings, cold expansion fittings, stainless steel clamp, insert fittingsInstall in accordance with manufacturer's instructions
Deleted
Polybutylene (PB) pipe and tubing1, 2, 3ASTM D 3309Heat-fusion, crimp/insert and compressionJoints in concrete shall be
heat-fused
Polyethylene (PE) pipe, tubing and fittings (for ground source heat
pump loop systems)
1, 2, 4ASTM D 2513
ASTM D 3350
ASTM D 2513
ASTM D 3035
ASTM D 2447
ASTM D 2683
ASTM F 1055
ASTM D 2837
ASTM D 3350
ASTM D 1693
Heat-fusion
Polyethylene/aluminum/polyethylene
(PE-AL-PE) pressure pipe
1, 2, 3ASTM F 1282
CSA B 137.9
Mechanical, crimp/insert
Polypropylene (PP)1, 2, 3ISO 15874
ASTM F 2389
Heat-fusion joints, mechanical fittings, threaded adapters, compression joints
Raised temperature polyethylene(PE-RT)1, 2, 3ASTM F 2623
ASTM F 2769
Copper crimp/insert fitting stainless steel clamp, insert fittings
Soldering fluxes1ASTM B 813Copper tube joints
Steel pipe1, 2ASTM A 53,
A 106
Brazed, welded, threaded, flanged and mechanical fittingsJoints in concrete shall be welded. Galvanized pipe shall not be welded or brazed.
Steel tubing1ASTM A 254Mechanical fittings, welded
For SI: °C = [(°F)-32]/1.8.
a. Use code:
1. Above ground.
2. Embedded in radiant systems.
3. Temperatures below 180°F only.
4. Low temperature (below 130°F) applications only.
b. Standards as listed in Chapter 44.
Hydronic piping systems shall be installed to permit draining of the system. Where the system drains to the plumbing drainage system, the installation shall conform to the requirements of Chapters 25 through 32 of this code.
Exception: The buried portions of systems embedded underground or under floors.
The potable water system shall be protected from backflow in accordance with the provisions listed in Section P2902.
Openings through concrete or masonry building elements shall be sleeved.
A hydronic piping system shall not be in direct contact with any building material that causes the piping material to degrade or corrode.
Wood-framed structural members shall be drilled, notched or altered in accordance with the provisions of Sections R502.8, R602.6, R602.6.1 and R802.7. Holes in load bearing members of cold-formed steel light-frame construction shall be permitted only in accordance with Sections R505.2.5, R603.2.5 and R804.2.5. In accordance with the provisions of Sections R505.3.5, R603.3.4 and R804.3.4, cutting and notching of flanges and lips of load-bearing members of cold-formed steel light-frame construction shall not be permitted. Structural insulated panels (SIPs) shall be drilled and notched or altered in accordance with the provisions of Section R613.
Fluid in the supply side of a hydronic system shall not enter a tee fitting through the branch opening.
Piping shall be installed so that piping, connections and equipment shall not be subjected to excessive strains or stresses. Provisions shall be made to compensate for expansion, contraction, shrinkage and structural settlement.
Hangers and supports shall be of material of sufficient strength to support the piping, and shall be fabricated from materials compatible with the piping material. Piping shall be supported at intervals not exceeding the spacing specified in Table M2101.9.

TABLE M2101.9
HANGER SPACING INTERVALS

PIPING MATERIALMAXIMUM
HORIZONTAL
SPACING
(feet)
MAXIMUM
VERTICAL
SPACING
(feet)
ABS 410
CPVC ≤ 1-inch pipe or tubing 35
CPVC ≥ 11/4 inches410
Copper or copper alloy pipe 1210
Copper or copper alloy tubing 610
PB pipe or tubing 2.674
PE pipe or tubing 2.674
PEX tubing 2.674
PP < 1-inch pipe or tubing 2.674
PP > 11/4 inches410
PVC 410
Steel pipe 1215
Steel tubing 810
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm.
Hydronic piping shall be tested hydrostatically at a pressure of not less than 100 pounds per square inch (690 kPa) for a duration of not less than 15 minutes.
Baseboard convectors shall be installed in accordance with the manufacturer's installation instructions. Convectors shall be supported independently of the hydronic piping.
Piping for embedment in concrete or gypsum materials shall be standard-weight steel pipe, copper tubing, cross-linked polyethylene/aluminum/cross-linked polyethylene (PEX-AL-PEX) pressure pipe, chlorinated polyvinyl chloride (CPVC), polybutylene, cross-linked polyethylene (PEX) tubing or polypropylene (PP) with a minimum rating of 100 psi at 180°F (690 kPa at 82°C).
Radiant floor heating systems shall have a thermal barrier in accordance with Sections M2103.2.1 through M2103.2.4.
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.
Radiant piping used in slab-on-grade applications shall have insulating materials having a minimum R-value of 5 installed beneath the piping.
In suspended floor applications, insulation shall be installed in the joist bay cavity serving the heating space above and shall consist of materials having a minimum R-value of 11.
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.
Insulating materials used in thermal barriers shall be installed so that the manufacturer's R-value mark is readily observable upon inspection.
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 with brazing material having a melting point exceeding 1,000°F (538°C).
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.
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 all joints shall be visually inspected for leaks.
Low temperature piping for embedment in concrete or gypsum materials shall be as indicated in Table M2101.1.
Piping joints, other than those in Section M2103.3, that are embedded shall comply with the following requirements:
1. Cross-linked polyethylene (PEX) tubing shall be installed in accordance with the manufacturer's instructions.
2. Polyethylene tubing shall be installed with heat fusion joints.
3. Polypropylene (PP) tubing shall be installed in accordance with the manufacturer's instructions.
Joints between polyethylene plastic pipe and tubing or fittings for ground source heat pump loop systems shall be heat fusion joints conforming to Section M2104.2.1.1, electrofusion joints conforming to Section M2104.2.1.2 or stab-type insertion joints conforming to Section M2104.2.1.3.
Joints shall be of the socket-fusion, saddle-fusion or butt-fusion type, fabricated in accordance with the piping manufacturer's instructions. Joint surfaces shall be clean and free of moisture. Joint surfaces shall be heated to melt temperatures and joined. The joint shall be undisturbed until cool. Fittings shall be manufactured in accordance with ASTM D 2683.
Joint surfaces shall be clean and free of moisture, and scoured to expose virgin resin. Joint surfaces shall be heated to melt temperatures for the period of time specified by the manufacturer. The joint shall be undisturbed until cool. Fittings shall be manufactured in accordance with ASTM F 1055.
Joint surfaces shall be clean and free of moisture. Pipe ends shall be chamfered and inserted into the fitting to full depth. Fittings shall be manufactured in accordance with ASTM D 2513.
Joints between raised temperature polyethylene tubing and fittings shall conform to Sections M2104.3.1 and M2104.3.2. Mechanical joints shall be installed in accordance with the manufacturer's instructions.
Where compression-type fittings include inserts and ferrules or O-rings, the fittings shall be installed without omitting such inserts and ferrules or O-rings.
Solder joints in a metal pipe shall not occur within 18 inches (457 mm) of a transition from such metal pipe to PE-RT pipe.
Joints between polyethylene/aluminum/polyethylene pressure pipe and fittings shall conform to Sections M2104.4.1 and M2104.4.2. Mechanical joints shall be installed in accordance with the manufacturer's instructions.
Where compression-type fittings include inserts and ferrules or O-rings, the fittings shall be installed without omitting such inserts and ferrules or O-rings.
Solder joints in a metal pipe shall not occur within 18 inches (457 mm) of a transition from such metal pipe to PE-AL-PE pipe.
The assembled loop system shall be pressure tested with water at 100 psi (690 kPa) for 30 minutes with no observed leaks before connection (header) trenches are backfilled. Flow rates and pressure drops shall be compared to calculated values. If actual flow rate or pressure drop figures differ from calculated values by more than 10 percent, the problem shall be identified and corrected.
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