Can a laundry sink drain be installed without a trap under it?
Wednesday, May 29, 2019
A laundry sink (also called a laundry tray or tub) can be connected to a washing machine standpipe without a P-trap if the sink drain is within 30-inches of the standpipe. Also, the top of the standpipe must be above the flood rim of the sink and rise at least 30” above the trap weir of the standpipe. So the trap at the standpipe effectively becomes the trap for the sink too.
Here’s how it is stated in the Residential Edition of the Florida Building Code and the International Residential Code.
The laundry sink shown in the photo above is unfotunately too far away from the standpipe to take advantage of this plumbing simplification. Also, see our blog post Is a sink required to have a drain stopper?
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