Page 646 - 2018_IRC

GENERAL PLUMBING REQUIREMENTS

TABLE P2605.1
PIPING SUPPORT
MAXIMUM HORIZONTAL MAXIMUM VERTICAL
PIPING MATERIAL
SPACING (feet) SPACING (feet)
ABS pipe 4 1 0 b
Aluminum tubing 10 15
Cast-iron pipe 5 a 15
Copper or copper-alloy pipe 12 10
1
Copper or copper-alloy tubing (1 / inches in diameter and smaller) 6 10
4
1
Copper or copper-alloy tubing (1 / inches in diameter and larger) 10 10
2
Cross-linked polyethylene (PEX) pipe, 1 inch and smaller 2.67 (32 inches) 10 b
1
Cross-linked polyethylene (PEX) pipe, 1 / inch and larger 4 10 b
4
Cross-linked polyethylene/aluminum/cross-linked polyethylene (PEX-AL-PEX) pipe 2.67 (32 inches) 4 b
CPVC pipe or tubing (1 inch in diameter and smaller) 3 10 b
1
CPVC pipe or tubing (1 / inches in diameter and larger) 4 10 b
4
Lead pipe Continuous 4
PB pipe or tubing 2.67 (32 inches) 4
Polyethylene of raised temperature (PE-RT) pipe, 1 inch and smaller 2.67 (32 inches) 10 b
1
Polyethylene of raised temperature (PE-RT) pipe, 1 / inch and larger 4 10 b
4
Polypropylene (PP) pipe or tubing (1 inch and smaller) 2.67 (32 inches) 10 b
1
Polypropylene (PP) pipe or tubing (1 / inches and larger) 4 10 b
4
PVC pipe 4 1 0 b
Stainless steel drainage systems 10 10 b
Steel pipe 12 15
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm.
a. The maximum horizontal spacing of cast-iron pipe hangers shall be increased to 10 feet where 10-foot lengths of pipe are installed.
b. For sizes 2 inches and smaller, a guide shall be installed midway between required vertical supports. Such guides shall prevent pipe movement in a direction
perpendicular to the axis of the pipe.

SECTION P2607 SECTION P2609
WATERPROOFING OF OPENINGS MATERIALS EVALUATION AND LISTING
P2607.1 Pipes penetrating roofs. Where a pipe penetrates a P2609.1 Identification. Each length of pipe and each pipe
roof, a flashing of lead, copper, galvanized steel or an fitting, trap, fixture, material and device utilized in a plumb-
approved elastomeric material shall be installed in a manner ing system shall bear the identification of the manufacturer
that prevents water entry into the building. Counterflashing and any markings required by the applicable referenced stan-
into the opening of pipe serving as a vent terminal shall not dards. Nipples created from the cutting and threading of
reduce the required internal cross-sectional area of the vent approved pipe shall not be required to be identified.
pipe to less than the internal cross-sectional area of one pipe Exception: Where the manufacturer identification cannot
size smaller. be marked on pipe fittings and pipe nipples because of the
P2607.2 Pipes penetrating exterior walls. Where a pipe small size of such fittings, the identification shall be
penetrates an exterior wall, a waterproof seal shall be made printed on the item packaging or on documentation pro-
on the exterior of the wall by one of the following methods: vided with the item.
1. A waterproof sealant applied at the joint between the P2609.2 Installation of materials. Materials used shall be
wall and the pipe. installed in strict accordance with the standards under which
2. A flashing of an approved elastomeric material. the materials are accepted and approved. In the absence of
such installation procedures, the manufacturer’s instructions
shall be followed. Where the requirements of referenced stan-
SECTION P2608 dards or manufacturer’s instructions do not conform to the
WORKMANSHIP minimum provisions of this code, the provisions of this code
P2608.1 General. Valves, pipes and fittings shall be installed shall apply.
in correct relationship to the direction of the flow. Burred P2609.3 Plastic pipe, fittings and components. Plastic pipe,
ends shall be reamed to the full bore of the pipe. fittings and components shall be third-party certified as con-
forming to NSF 14.

2018 INTERNATIONAL RESIDENTIAL CODE ® 621
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