The Golden State: Where & How to Live, Secure, Visit, Enjoy and Thrive in California
New Handy Site On Plumbing
One or Two Water Closets or Similar Fixtures. Two water closets located on the same floor discharging into a double Y or sanitary Tee cross, or any closet discharging into a Y branch or sanitary Tee, need not be back vented, provided that the developed distance of the horizontal soil branch extended with a grade of not less than 1/4 inch per foot does not exceed the inside diameter of the soil branch and the vertical leg between the horizontal soil branch and the trap water level does not exceed two feet.
Fixtures Other Than Water Closets. Two fixtures other than water closets discharging into a double Y or sanitary Tee cross or an individual fixture other than a water closet discharging into a Y branch or sanitary Tee need not be back vented, providing the total fall of the waste pipe between water level of the trap and the vent pipe extended at a grade of not less than 1/4 inch per foot does not exceed the inside diameter of the branch waste pipe.
Crown Vent Prohibited. In no case shall the vent be taken off from the crown of the trap. (See sketches Xo. 10 and Xo. 11.)
Vents Reconnected. All vents shall be run separately through the roof; or be reconnected at least eight inches below the roof; or be reconnected to the main vent pipe not less than three feet above the highest floor on which fixtures are placed. Xo fitting for future waste connections shall be placed in any soil or waste pipe above the point of revent connection. (See sketch No. 27.)
Vent Pipe Grades and Connections. All branch vent and back vent pipes shall be free from drops or sags, and shall be so graded and connected as to drip back to the soil or waste pipe by gravity Whenever it becomes necessary to trap a horizontal vent pipe, the proper method for doing so must be complied with. (See sketch Xo. 12.)
Fixtures Parted by Walls. Where bath rooms, water closets, or other fixtures are located on opposite sides of a wall or partition, or are directly adjacent to each other in two inseparable buildings, such fixtures may have a common soil or waste pipe and vent pipe stack.
Continuous or Circuit Vent Installation. Batteries of closets, urinals, sinks, basins, etc., may be installed by a continuous or circuit vent system. Loops and circuit vents shall be of following sizes: 2 inches for a battery of two closets, 3 inches for a battery of five closets, 4 inches for a battery of six to twelve closets. For urinals, sinks, basins, or similar fixtures the loop or circuit shall be of size provided in Chart A. Methods of such installation are shown in sketches Xos. 13, 14, and 15.
