Choosing materials for a venting system is not usually much problem. Most jobs use Schedule-40 plastic pipe for vent pipes. There are, however, other options for vent materials. And, not all codes allow the same types of vent materials. You will also notice from the following tables of approved materials that there can be a difference in approved materials for vents that are installed underground, compared to those installed above ground. We will close out this chapter with tables that indicate what types of materials are allowed within major plumbing codes.
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FIGURE 5.49 ■ Materials approved for above-ground vents in Zone Two. (Courtesy of McGraw-Hill)
FIGURE 5.51 ■ Materials approved for underground vents in Zone One. (Courtesy of McGraw-Hill)
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FIGURE 5.50 ■ Materials approved for above-ground vents in Zone Three. (Courtesy of McGraw-Hill)
FIGURE 5.52 ■ Materials approved for underground vents in Zone Two. (Courtesy of McGraw-Hill)
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