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Section 704 Drainage Piping Installation

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704.1 Slope of Horizontal Drainage Piping
Horizontal drainage piping shall be installed in uniform alignment at uniform slopes. The slope of a horizontal drainage pipe shall be not less than that indicated in Table 704.1 except that where the drainage piping is upstream of a grease interceptor, the slope of the piping shall be not less than 1/4 inch per foot (2-percent slope).
TABLE 704.1
SLOPE OF HORIZONTAL DRAINAGE PIPE
SIZE (inches) MINIMUM SLOPE (inch per foot)
21/2 or less 1/4a
3 to 6 1/8a
8 or larger 1/16a
For SI: 1 inch = 25.4 mm, 1 inch per foot = 83.33 mm/m.
  1. Slopes for piping draining to a grease interceptor shall comply with Section 704.1.
704.2 Reduction in Pipe Size in the Direction of Flow
The size of the drainage piping shall not be reduced in the direction of the flow. The following shall not be considered as a reduction in size in the direction of flow:
  1. A 4-inch by 3-inch (102 mm by 76 mm) water closet flange.
  2. A water closet bend fitting having a 4-inch (102 mm) inlet and a 3-inch (76 mm) outlet provided that the 4-inch leg of the fitting is upright and below, but not necessarily directly connected to, the water closet flange.
  3. An offset closet flange.
704.3 Connections to Offsets and Bases of Stacks
Horizontal branches shall connect to the bases of stacks at a point located not less than 10 times the diameter of the drainage stack downstream from the stack. Horizontal branches shall connect to horizontal stack offsets at a point located not less than 10 times the diameter of the drainage stack downstream from the upper stack.
704.4 Future Fixtures
Drainage piping for future fixtures shall terminate with an approved cap or plug.

Related Code Sections

Section 704 Sanitary Drainage, Drainage Piping Installation
Horizontal drainage piping shall be installed in uniform alignment at uniform slopes. The slope of a horizontal drainage pipe shall be not less than ...
Section 704 Sanitary Drainage, Drainage Piping Installation
Horizontal drainage piping shall be installed in uniform alignment at uniform slopes. The slope of a horizontal drainage pipe shall be not less than ...
Section 704 Sanitary Drainage, Drainage Piping Installation
Horizontal drainage piping shall be installed in uniform alignment at uniform slopes. The minimum slope of a horizontal drainage pipe shall ...
704.2 Sanitary Drainage, Change in Size
The size of the drainage piping shall not be reduced in size in the direction of the flow. A 4-inch by 3-inch (102 mm by 76 mm) water closet ...
704.3 Sanitary Drainage, Connections to Offsets and Bases of Stacks
Horizontal branches shall connect to the bases of stacks at a point located not less than 10 times the diameter of the drainage stack downstream from ...