Fixtures & Water HeatersQuestion 224 of 360
A floor drain located in a room that is used infrequently may lose its trap seal by evaporation. The approved way to keep the seal is to provide:
a.a larger trap arm
b.a second floor drain nearby
c.a trap primer or an approved trap seal protection device
d.a deeper cleanout
Explanation
In little-used areas, water in a floor drain trap can evaporate and let sewer gas enter. A trap primer periodically adds water to maintain the seal, or an approved barrier-type trap seal device may be used. This keeps the required 2-to-4-inch seal intact.
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