How To Look At A House
McGarry and Madsen's home inspection blog for buyers of
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Can I make a trap under the sink from straight pipe and 90º elbows?
Tuesday, August 7, 2018
A plumbing trap is designed to always maintain a small pool of water that seals the drain pipe against sewer gas rising up into a home. But even a standard U-shaped trap tends to get clogged occasionally, and the slip fittings make it easy enough to open the trap an clear out a clog if necessary.
Why invite trouble with a rectangular trap that is more resistant to water flow? The 90º elbows definitely fit the description of “shoulders” and “ledges” that are “capable of retarding or obstructing the flow of the piping" in the International Plumbing Code and the Florida Plumbing Code (1004.1) citation shown above. Also, traps are required to be “self scouring” at 1002.2, which this configuration is definitely not. So just don’t do it.
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