Planning & EstimatingQuestion 288 of 360
While laying out the building drain you reach a 90° change of direction. Under the CPC, what feature is generally required at such a change of direction on the horizontal drain?
a.A cleanout
b.A pressure-reducing valve
c.A backwater vent only
d.An expansion tank
Explanation
CPC 707.0 requires cleanouts at changes of direction greater than 45 degrees in horizontal drainage piping so the line can be rodded from that point. Planning the cleanout into the layout keeps the run serviceable. Missing a required cleanout is a common cause of failed rough-in inspections.
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