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Old 02-25-2010, 03:25 PM   #1
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Washing Machine Drain Pipe

Hopefully a plumber out there can help me out. I am finishing my basement and part of the job required me to relocate the laundry sink a few feet away. I decided it would be nice to also install a drain pipe for the washing machine and connect it to the existing drain. The inspector said that because the drain is only 1-1/2" I cannot connect a laundry drain pipe to it, but must use the newly relocated sink to catch and drain the washing machine water. He also had instructions on how I need to arrange a vent pipe.

Is there any way I can configure a drain pipe from the washing machine so that it can feed into a 1-1/2" pipe?


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Old 02-25-2010, 05:09 PM   #2
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The problem is that some washing machines discharge water too fast for the 1-1/2 inch pipe to accommodate.

Using the sink to catch the water first, the water can sit there and have more time to go down the 1-1/2 inch drain without backing up.

The washing machine drain hose must fit loosely into where it drains and must not be spliced onto for more length. The washing machine internal pump will be overloaded if you try to use it to force water down a too-small drain pipe.


The good conscientious technician or serviceperson will carry extra oils and lubricants in case the new pump did not come with oil or the oil was accidentally spilled, so the service call can be completed without an extra visit.

Last edited by AllanJ; 02-25-2010 at 05:14 PM.
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Old 02-25-2010, 05:19 PM   #3
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Alternative Solution?

Thanks Alan - Once I saw a washing machine drain into a much larger pipe before going into the 1-1/2 inch drain. Supposidly, this larger length of pipe provided a measure of overflow in case the washer put out too much water before it could be drained off. This may have been a sub code arrangement, just not sure.
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drain , pipe , size , vent , washer

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