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Old 07-09-2013, 06:42 AM   #1
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Four inch drain changes to three inch


Was over a friends house which was built in 2007, and noticed he had a four inch drain pipe running down his wall. It then changed to 3 inch- six inches before it went into the concrete. Is that code? I would have never known you could go from bigger to smaller. Is it common to have the main underground drain as three inch pipe?

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Old 07-09-2013, 07:24 AM   #2
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Four inch drain changes to three inch


A drain can never be reduced.

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Old 07-09-2013, 04:27 PM   #3
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Four inch drain changes to three inch


Now this is in a very urban area, how in the world did that ever pass inspection?
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Old 07-09-2013, 04:54 PM   #4
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Four inch drain changes to three inch


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Originally Posted by mj12 View Post
Now this is in a very urban area, how in the world did that ever pass inspection?
Why would you assume it was inspected?
You act like no hack plumbing ever occurs.
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Old 07-09-2013, 04:55 PM   #5
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Four inch drain changes to three inch


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A drain can never be reduced.
In the direction of flow it can be reduced from 4 inch to 3 inch if the 3 inch is upstream.
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Old 07-09-2013, 08:59 PM   #6
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Four inch drain changes to three inch


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In the direction of flow it can be reduced from 4 inch to 3 inch if the 3 inch is upstream.
It wouldn't be reduced it would be increased 2 to 3 to 4 to 6 and so on.

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