allowance and cut the needed length of pipe (1⅜″ + 1″ + 1″ = 3⅜″). A test tee for the cleanout can be joined to the sanitary tee with a 2¼″ length of pipe. This is two times the fitting allowance plus ¼″. A trial assembly of these components will allow the dimensions to be checked before final assembly. Cleanouts may be required at each change in direction of the DWV piping that is greater than 45°. Exceptions may be made so that no more than one cleanout is required per a specified run of pipe. It may be possible to delay installing the hori- zontal pipes to the standpipe and laundry tub until the concrete floor has been poured. This will make it easier for the concrete finisher and may prevent damage to these pipes. If this installation is delayed, the sanitary tee inlets should be plugged to prevent anything from getting into the piping. The next task is to locate the sanitary tee to the kitchen sink in the stack. This is somewhat complicated because both the stack and the vertical drainpipe to the kitchen sink must be offset so the upper portion of the pipe will run through the exterior wall cavity, Figure 19-9 (side view). The Since the sanitary tee inlet must be lower than the P-trap outlet, subtract the ⅝ ″ fall from the center- line height of the P-trap to determine the height of the sanitary tee above the footing (8⅝″ – ⅝ ″ = 8″). Mark the 8″ height on the foundation wall near where the stack will be located. Check the position of the long-turn ell. Hold the sanitary tee in the correct position and measure the distance from the face of the long-turn ell to the face of the sanitary tee. For this example, assume this distance is 4½″. The appropriate fitting allowance must be added to this face-to-face measurement before the pipe is cut to length (4½″ + 1″ + 1″ = 6½″). Test fit the ell, the length of pipe, and the sanitary tee and use them to help determine the length of the pipe needed to join the sanitary tee for the laundry tub to the stack. The inlet for the second sanitary tee (connecting a laundry tub to the stack) can be located in a similar fashion, Figure 19-8.According to the rough-in dimensions for the laundry tub, the stub-out must be 12″ above the finished floor, making it 16″ above the footing. An allowance for fall must also be taken into account for this instal- lation. If the distance from the stack to the 90° ell is 3′, the allowance for fall is ¾″ (3′ × ¼″). The height of the inlet of the sanitary tee should be 15¼″ above the footing (12″ + 4″ – ¾″). Mark this location on the foundation wall. Align the center of the sanitary tee inlet with the mark on the wall and then measure the distance between the faces of the tees (1⅜″). Add the appropriate fitting To building sewer 3′ Concrete footing Top of concrete floor 90° ell for stub-out 4″ 16″ 151⁄4″ Mark centerline of sanitary tee Mark centerline of 90° ell 13⁄8″ Goodheart-Willcox Publisher Figure 19-8. Locating pipe and fittings for the laundry tub. Chapter 19 DWV Pipe and Fitting Installation 303 Copyright Goodheart-Willcox Co., Inc.