How To Look At A House
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Does a sink drain trap have to be plumb?
Sunday, November 1, 2020
"Traps shall be set level with respect to their water seals,” according to the International Residential Code (IRC P3201.3) and the Residential edition of the Florida Building Code (FBC). But the goofy angle of the trap shown above is only one of its problems. The trap is also installed backwards, creating an excessively tall trap seal, and the accordion-type piping makes the whole assembly guaranteed to clog. The trap shown at right is a much less egregious example, but needs to be correctly aligned with the tailpiece.
A plumbing trap must maintain enough water in it to prevent sewer gas from rising up into the house, but not so much that it creates a drain that is sluggish and easily clogged, and the interior surface of the pipe should be self-scouring.
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