Copyright Goodheart-Willcox Co., Inc. 335 Chapter Review Summary■ ■ The second rough stage is the installation of all plumbing that will be enclosed in the walls or installed before the walls are finished. ■ ■ Schematic drawings provide the data used to determine the size of each part of DWV piping in a building. ■ ■ Measurements to determine the length of pipe are taken face-to-face, shoulder-to- shoulder, or center-to-center. ■ ■ DWV installation occurs in three sections: horizontal runs below a basement floor, bathroom piping, and kitchen and laundry area piping. ■ ■ DWV plastic piping is generally measured by either the face-to-face or the shoulder-to- shoulder method. ■ ■ Copper DWV pipe measurements can often be taken shoulder-to-shoulder but face-to- face measurements are usually more convenient. ■ ■ Galvanized iron pipe is seldom used for DWV systems except to run small diameter drains as a part of a cast-iron DWV system. ■ ■ The correct allowances for the depth of the hub on common sizes of hub and spigot cast- iron pipe must be included when measuring pipe length. Know and Understand Answer the following questions using the information provided in this chapter. 1. The d.f.u. values for a group of fixtures is _____ the total d.f.u. for all of the individual fixtures in the group. A. less than B. more than C. equal to D. None of the above. 2. When measuring to determine the length of a pipe required to connect two fittings, the only method that does not require making allowances for fittings is _____. A. center-to-center B. face-to-face C. shoulder-to-shoulder D. None of the above. 3. True or False? The DWV piping system is installed before the water supply piping. 4. Horizontal runs of DWV piping must be installed with a fall of _____ per foot of run. A. 1″ B. 1/2″ C. 1/4″ D. 1″ 5. True or False? The P-trap at the base of a standpipe is typically installed during the first rough stage. 6. _____ is material used to prevent water from leaking into a building around the stack. A. Spackle B. Cement C. Flashing D. Mortar 7. The first step in the process of joining plastic pipe is to _____ the pipe and fitting. A. clean B. apply solvent cement to C. caulk D. apply joint tape to 8. True or False? A cemented plastic pipe joint is correctly made if a bead of cement forms completely around the fitting. 9. The material applied to threaded pipe before assembly is called _____. A. pipe joint seal B. Teflon tape C. cement D. Both A and B.