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Fentoozler
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5,623 Posts
Discussion Starter · #1 ·
Which is "better" for a typical SFH's closet flange to the main DWV?

In talking with a local plumbing inspector, he offered his "opinion"....I now ask the pros for their opinions.
 

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Fentoozler
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5,623 Posts
Discussion Starter · #10 ·
Why run 4" when code allows 3" for up to 3 toilet till you need to be 4", cost less to run 3" then 4"

...because that doesn't really answer the question:

Which is "better" for a typical SFH's closet flange to the main DWV?

In talking with a local plumbing inspector, he offered his "opinion"....I now ask the pros for their opinions.
Cheaper is not always "better".
Bare code minimum is not always "better".
 

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Registered
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4,732 Posts
I'm not a plumber, but I have stayed at Holiday Inn, and used a lot of toilets....


Given the same toilet, 3" will have a faster flow than 4"...

Gets 'stuff' movin down the line:thumbsup:

What is larger than 3" that will go through the trap in the WC?
 

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The Old Master
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92 Posts
DFU's Drainage fixture units goveren the piping size.

Read the code book! Usually on residential work the I.P.C. will allow 2 bathroom groups on 3" PVC/ABS, No/Hub cast iron, copper tube. More fixtures (ie: another powder room or a mud bath) the the piping from that point of connection to the main must be 4" to the exit from the building. Usually 4" is required for the house sewer at least in the code we follow.
 
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