RISER DIAGRAMS

Riser diagrams are often required by code officers prior to any plumbing be­ing installed. Supplying a detailed riser diagram (Fig. 5.44 and Fig. 5.45) is usu­ally a standard part of a permit applica­tion. You can also use riser diagrams to help you when sizing a vent system. If

RISER DIAGRAMS

FIGURE 5.45 ■ DWV riser diagram, with size and location of pipes. (Courtesy of TAB Books, Home Plumbing Illustrated, by R. Dodge Woodson, p. 50)

RISER DIAGRAMS

FIGURE 5.46 ■ Poorly designed DWV layouts. (Courtesy of TAB Books, Home Plumbing Illustrated, by R. Dodge Woodson, p. 55)

RISER DIAGRAMS
you draw a riser for the job you are working with, the diagram will make it easier for you to label the fixture-unit loads and the sizes of the vents re­quired. Another good use of a riser diagram is to minimize wasted piping. If you draw your piping path on paper, you can spot situations where an alter­native plan might be used to minimize the cost of labor and materials (Fig. 5.46 and Fig. 5.47).

Updated: 16 ноября, 2015 — 11:07 дп