10″ 4″ To building sewer 3′ 45⁄8″ 2′-6″ 8″ min. Concrete footing Top of concrete floor To kitchen C.O. Standpipe Stack Goodheart-Willcox Publisher Figure 19-6. Pipe and fittings for lower portion of stack serving the laundry sink (left) and the washing machine standpipe (right). A B C 2′-6″ Flat surface A Flat surface B To building sewer Concrete footing Top of concrete floor 85⁄8″ 8″ 4″ Mark the centerline of the P-trap Mark centerline of sanitary tee Fall @ 1⁄4″ per foot of run: 21⁄2′ × 1⁄4″ per ft = 5⁄8″ total fall 2′-6″ Goodheart-Willcox Publisher Figure 19-7. Locating pipe and fittings for the washing machine standpipe. A—Determining fitting centerlines. B—Marking fitting locations. C—Calculating fall. 302 Section 3 Plumbing System Design and Installation Copyright Goodheart-Willcox Co., Inc.