Contractor Talk - Professional Construction and Remodeling Forum banner
1 - 20 of 76 Posts

·
Fentoozler
Joined
·
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.
 

·
Fentoozler
Joined
·
5,623 Posts
Discussion Starter · #6 ·
Why?

I generally see 4" cast with lead elbows all over.
 

·
Fentoozler
Joined
·
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".
 

·
Fentoozler
Joined
·
5,623 Posts
Discussion Starter · #12 ·
Sorry you can't accept my answer I shall bow out.
It's not the I can't accept your answer....I just won't accept it w/o some theory or logic behind it.
Simply because "it's code" doesn't sit well with me.
 

·
Project Manager
Joined
·
2,642 Posts
It's not based on number of toilets, but quantity and size of meals. Do you attend a lot of all-u-can-eat buffets? Fast food? Corn?

Better opt for the 4" to be on the safe side.
 

·
Registered
Joined
·
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?
 

·
The Old Master
Joined
·
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.
 

·
Registered
Joined
·
3,196 Posts
just make sure the pipe dumps into your neighbors pond
 
1 - 20 of 76 Posts
Top