Washing Machine Drain

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Old 04-04-07, 04:31 PM
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Washing Machine Drain

I have an 1-1/2" ABS drain from an upstairs washing machine running into my basement. I want to add another washing machine in our basement, can I have 2 washers draining into one 1-1/2" drain? or do I have to up it to 2" inch drain for the 2 machines?

thanks in advance....
 
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Old 04-04-07, 08:30 PM
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NO. The UPC requires a minimum 2" drain for one washing machine. As a practical matter, we have seen many homes with 1" drains, but they tend to be problematic with new machines. If you put to machines on a one and a half inch drain, you are guaranteed to have flooding/overflow problems.
 
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Old 04-04-07, 09:13 PM
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Do you think 2 machines on one 2 inch drain would be OK then?
 
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Old 04-05-07, 03:25 PM
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Not unless you could somehow ensure that both machines would never discharge to the drain at the same time.

Is it possible for one of the machines to discharge to a laundry tub that is connected to the drain? An open tub that will hold the entire amount of the discharge water and then drain through a standard 1-1/2 inch trap is common and perfectly acceptable.
 
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Old 04-06-07, 07:11 AM
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Don't want to hijack the thread, but can a anyone tell me why a 1 1/2" drain would not be adequate for a washing machine with a 1" discharge hose? I've always wondered why code requires a 2" drain for this.
 
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Old 04-06-07, 04:58 PM
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Wayne, if the washing machine drained by gravity through the 1 inch hose there would be no problem at all. But the washing machine doesn't drain by gravity, it has a pump and that pump discharges the water at high volume, better than 30 gallons a minute.

A 1-1/2 inch gravity drain cannot handle 30 gallons per minute. If you were to hard-connect the washing machine drain hose to the 1-1/2 inch drain it could handle the flow but it would then be a pressurized drain and that would create other problems.
 
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