Tapping washer into bathroom drain line

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Old 11-16-16, 03:31 PM
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Question Tapping washer into bathroom drain line

if you install a washer next to the bathroom you can tap into the drain pipe from the bath sink to drain the washer. Of course you need an S trap but here is a question..
can you go straight in to the other pipe or should you try to get an angled junction piece
that drains down into the pipe at an angle down ..in order to discourage the wash water from backing up into the bath sink..?? washers can throw a lot of water down a pipe all of a sudden..
 
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Old 11-16-16, 04:12 PM
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The problem is that a standard 1-1/2" drain pipe cannot take the flow from the washer. You will have water possibly coming out of the sink and definitely back up and out the drain tube.
 
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Old 11-17-16, 07:23 AM
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so whats the right way??..........................
 
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Old 11-17-16, 10:09 AM
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You need to attach to a larger drain line. It may be a larger line inside the wall requiring you to open the wall.
 
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Old 11-17-16, 11:40 AM
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if you install a washer next to the bathroom you can tap into the drain pipe from the bath sink to drain the washer.
Where did you get this information? I'd say, in many cases you can not just tap into the bathroom sink to drain a washer. Since the bathroom group is generally vented together, you aren't allowed to just tie into it without either connecting downstream of the bathroom drains and adding a new vent for the new fixture.

Also, as Pete pointed out, washers require a 2" drain as newer washers tend to expel a lot of water very quickly and can easily overflow a 1.5" standpipe.
 
 

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