Copyright

Preface

Effective Use of the International Residential Code

Part I ‒ Administration

Chapter 1 Administration

Part II ‒ Definitions

Chapter 2 Definitions

Part III ‒ Building Planning and Construction

Chapter 3 Building Planning

Chapter 4 Foundations

Chapter 5 Floors

Chapter 6 Wall Construction

Chapter 7 Wall Covering

Chapter 8 Roof-Ceiling Construction

Chapter 9 Roof Assemblies

Chapter 10 Chimneys and Fireplaces

Part IV ‒ Energy Conservation

Chapter 11 Energy Efficiency

Part V ‒ Mechanical

Chapter 12 Mechanical Administration

Chapter 13 General Mechanical System Requirements

Chapter 14 Heating and Cooling Equipment

Chapter 15 Exhaust Systems

Chapter 16 Duct Systems

Chapter 17 Combustion Air

Chapter 18 Chimneys and Vents

Chapter 19 Special Fuel-Burning Equipment

Chapter 20 Boilers and Water Heaters

Chapter 21 Hydronic Piping

Chapter 22 Special Piping and Storage Systems

Chapter 23 Solar Systems

Part VI ‒ Fuel Gas

Chapter 24 Fuel Gas

Part VII ‒ Plumbing

Chapter 25 Plumbing Systems

Chapter 26 — 28

Chapter 29 Water Supply and Distribution

Chapter 30 — 33

Chapter 34 General Requirements

Chapter 35 — 43

Part IX ‒ Referenced Standards

Chapter 44 Referenced Standards

Hydronic piping shall conform to Table 2101.1. 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 2101.1
HYDRONIC PIPING MATERIALS

MATERIALUSE
CODEa
STANDARDbJOINTSNOTES
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 fittingsJoints 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 B137.10Mechanical, crimp/insertInstall in accordance with manufacturer’s instructions.
PEX FittingsASTM F 1807
ASTM F 1960
ASTM F 2098
Copper-crimp/insert fittings, cold expansion fittings, stainless steel clamp, insert fittingsInstall in accordance with manufacturer’s instructions
Plastic fittings PEXASTM F 1807
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 1693Heat-fusion
Polyethylene/aluminum/polyethylene
(PE-AL-PE) pressure pipe
1, 2, 3ASTM F 1282
CSA B 137.9
Mechanical, crimp/insert
Polyproplylene (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 2623Copper 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 the plumbing 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 the plumbing code .
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 502.8, 602.6, 602.6.1 and 802.7. Holes in load bearing members of cold-formed steel light-frame construction shall be permitted only in accordance with Sections 505.2.5, 603.2.5 and 804.2.5. In accordance with the provisions of Sections 505.3.5, 603.3.4 and 804.3.4, 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 613.
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 2101.9.

TABLE 2101.9
HANGER SPACING INTERVALS

PIPING MATERIALMAXIMUM HORIZONTAL SPACING
(feet)
MAXIMUM VERTICAL SPACING
(feet)
ABS410
CPVC ≤ 1 inch pipe or tubing35
CPVC ≥ 11/4 inch410
Copper or copper alloy pipe1210
Copper or copper alloy tubing610
PB pipe or tubing2.674
PE pipe or tubing2.674
PEX tubing2.674
PP < 1 inch pipe or tubing2.674
PP > 11/4 inch410
PVC410
Steel pipe1215
Steel tubing810
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 2103.2.1 through 2103.2.4.

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 2101.1.

Piping joints (other than those in Section 2103.2) 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 2104.2.1.1, electrofusion joints conforming to Section 2104.2.1.2 or stab-type insertion joints conforming to Section 2104.2.1.3.
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 2104.3.1 and 2104.3.2. 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 2104.4.1 and 2104.4.2. 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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