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This is a drain for a kitchen, not too surprising it drained slowly.  This is a pretty easy  fix, a few more pipe supports needed

All plumbing needs supports, and depending on the materials, it may be from 2.7 feet to 12. Improper support can create air pockets and clogged drains.  It may lead to stress on the pipe and fittings causing leaks on both supply and DWV systems. Poor support can also cause the system to be noisy.  ABS is fairly cheap plastic, and needs proper support to create the correct slope.

So the next question, what is the proper slope for that drain?

Proper slope helps to prevent clogging, The minimum velocity in a horizontal drain pipe is 2 feet per second (0.61 m/s). This is called the “scouring velocity.” The velocity is intended to keep solids in suspension.

The proper slope  for that 2″ drain is  ¼ in. per foot (2%) and any pipe ≥ 3 in. – ⅛ in. per foot (1%).

Plumbing is more complicated than you might think!


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JJ Greive

JJ & Suzanne are both licensed, highly skilled inspectors and educators. We are the authors of our class curriculum, and truly enjoy sharing this with our students


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