Plumbing fixtures, drains, appurtenances and appliances used to receive or discharge liquid wastes or sewage shall be directly connected to the sanitary drainage system of the building or premises, in accordance with the requirements of this code. This section shall not be construed to prevent indirect waste connections where required by the code.
Exception: Bathtubs, showers, lavatories, clothes washers and laundry trays shall not be required to discharge to the sanitary drainage system where such fixtures discharge to systems complying with Sections P2910 and P2911.
In flood hazard areas as established by Table R301.2(1):
Metallic piping, except for cast iron, ductile iron and galvanized steel, shall not be placed in direct contact with steel framing members, concrete or masonry. Metallic piping shall not be placed in direct contact with corrosive soil. Where sheathing is used to preventdirect contact, the sheathing material thickness shall be 0.010 inch (0.254 mm) and shall be made of plastic. Where sheathingprotects piping that penetrates concrete or masonry walls or floors, the sheathing shall be installed in a manner that allows movement of the piping within the sheathing.
Exception: Sleeving is not required for installation of CPVC into concrete or similar material.
Piping shall be supported in accordance with the following:
- Piping shall be supported to ensure alignment and prevent sagging, and allow movement associated with the expansion and contraction of the piping system.
- Piping in the ground shall be laid on a firm bed for its entire length, except where support is otherwise provided.
- Hangers and anchors shall be of sufficient strength to maintain their proportional share of the weight of pipe and contents and of sufficient width to prevent distortion to the pipe. Hangers and strapping shall be of approved material that will not promote galvanic action. Rigid support sway bracing shall be provided at changes in direction greater than 45 degrees (0.79 rad) for pipe sizes 4 inches (102 mm) and larger.
- Piping shall be supported at distances not to exceed those indicated in Table P2605.1.
|PIPING MATERIAL||MAXIMUM HORIZONTAL|
|Copper or copper alloy pipe||12||10|
|Copper or copper alloy tubing (11/4 inches in diameter and smaller)||6||10|
|Copper or copper alloy tubing (11/2 inches in diameter and larger)||10||10|
|Cross-linked polyethylene (PEX) pipe, 1 inch and smaller||2.67 (32 inches)||10b|
|Cross-linked polyethylene (PEX) pipe, 11/4 inch and larger||4||10b|
|Cross-linked polyethylene/aluminum/cross-linked polyethylene (PEX-AL-PEX) pipe||2.67 (32 inches)||4b|
|CPVC pipe or tubing (1 inch in diameter and smaller)||3||10b|
|CPVC pipe or tubing (11/4 inches in diameter and larger)||4||10b|
|PB pipe or tubing||2.67 (32 inches)||4|
|Polyethylene of raised temperature (PE-RT) pipe, 1 inch and smaller||2.67 (32 inches)||10b|
|Polyethylene of raised temperature (PE-RT) pipe, 11/4 inch and larger||4||10b|
|Polypropylene (PP) pipe or tubing (1 inch and smaller)||2.67 (32 inches)||10b|
|Polypropylene (PP) pipe or tubing (11/4 inches and larger)||4||10b|
|Stainless steel drainage systems||10||10b|
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm.
- The maximum horizontal spacing of cast-iron pipe hangers shall be increased to 10 feet where 10-foot lengths of pipe are installed.
- 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.
Where a pipe penetrates an exterior wall, a waterproof seal shall be made on the exterior of the wall by one of the following methods:
- A waterproof sealant applied at the joint between the wall and the pipe.
- A flashing of an approved elastomeric material.
Each length of pipe and each pipe fitting, trap, fixture, material and device utilized in a plumbing system shall bear the identification of the manufacturer and any markings required by the applicable referenced standards. Nipples created from the cutting and threading of approved pipe shall not be required to be identified.
Exception: Where the manufacturer identification cannot be marked on pipe fittings and pipe nipples because of the small size of such fittings, the identification shall be printed on the item packaging or on documentation provided with the item.