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09-21-2009, 04:24 PM
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#1
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Fentoozler
Trade:
Professional Pie and Pastry Taster
Join Date: May 2007
Location: New Jersey
Posts: 5,589
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3" or 4" ?
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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The UD is quite possibly man kinds finest accomplishment.
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09-21-2009, 04:31 PM
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#2
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Pro
Trade:
Construction
Join Date: Jun 2009
Location: VA
Posts: 879
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In the UK we was always told to use no less than 4" soil pipe but i see a lot of 3" over here and it seems to do the job. Esp now that the toilets are using a lot less water to flush. But i do notice the toilets over here block up a lot more than in the UK.
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09-22-2009, 10:46 PM
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#3
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Pro Plumber
Trade:
Plumber
Join Date: Oct 2006
Location: Oregon
Posts: 2,749
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SFH's?
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09-22-2009, 10:55 PM
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#4
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Fentoozler
Trade:
Professional Pie and Pastry Taster
Join Date: May 2007
Location: New Jersey
Posts: 5,589
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Quote:
Originally Posted by Ron The Plumber
SFH's?
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Single
Family
Home
s
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The UD is quite possibly man kinds finest accomplishment.
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09-22-2009, 10:58 PM
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#5
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Pro Plumber
Trade:
Plumber
Join Date: Oct 2006
Location: Oregon
Posts: 2,749
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3" Always
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09-22-2009, 11:02 PM
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#6
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Fentoozler
Trade:
Professional Pie and Pastry Taster
Join Date: May 2007
Location: New Jersey
Posts: 5,589
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Why?
I generally see 4" cast with lead elbows all over.
__________________
The UD is quite possibly man kinds finest accomplishment.
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09-22-2009, 11:07 PM
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#7
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Pro Plumber
Trade:
Plumber
Join Date: Oct 2006
Location: Oregon
Posts: 2,749
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For new installs 3" ABS or PVC.
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09-22-2009, 11:10 PM
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#8
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Fentoozler
Trade:
Professional Pie and Pastry Taster
Join Date: May 2007
Location: New Jersey
Posts: 5,589
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...why not 4" ABS or PVC?
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The UD is quite possibly man kinds finest accomplishment.
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09-22-2009, 11:15 PM
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#9
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Pro Plumber
Trade:
Plumber
Join Date: Oct 2006
Location: Oregon
Posts: 2,749
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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"
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09-22-2009, 11:19 PM
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#10
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Fentoozler
Trade:
Professional Pie and Pastry Taster
Join Date: May 2007
Location: New Jersey
Posts: 5,589
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Quote:
Originally Posted by Ron The Plumber
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"
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...because that doesn't really answer the question:
Quote:
Originally Posted by Celtic
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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Cheaper is not always "better".
Bare code minimum is not always "better".
__________________
The UD is quite possibly man kinds finest accomplishment.
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09-22-2009, 11:21 PM
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#11
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Pro Plumber
Trade:
Plumber
Join Date: Oct 2006
Location: Oregon
Posts: 2,749
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Sorry you can't accept my answer I shall bow out.
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09-22-2009, 11:23 PM
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#12
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Fentoozler
Trade:
Professional Pie and Pastry Taster
Join Date: May 2007
Location: New Jersey
Posts: 5,589
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Quote:
Originally Posted by Ron The Plumber
Sorry you can't accept my answer I shall bow out.
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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.
__________________
The UD is quite possibly man kinds finest accomplishment.
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09-22-2009, 11:24 PM
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#13
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Pro Plumber
Trade:
Plumber
Join Date: Oct 2006
Location: Oregon
Posts: 2,749
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Waste water flows just a well inside 3" as it does inside 4", that sounds logical to me.
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09-23-2009, 05:48 AM
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#14
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Illusion of Perfection
Trade:
Residential Remodeler/Custom Carpenter
Join Date: Feb 2009
Location: Wayne, PA
Posts: 678
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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.
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Mark
Wayne, PA
"It is what it is."
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09-23-2009, 07:36 AM
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#15
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Pro
Trade:
GC/Remodeling
Join Date: Sep 2007
Location: Central America (Kansas)
Posts: 623
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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 
What is larger than 3" that will go through the trap in the WC?
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Quote:
Originally Posted by jeremy-lvhm
...just stop it. go sit down and have a lollipop and think about what your saying.  |
Last edited by TimelessQuality; 09-23-2009 at 07:51 AM.
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09-23-2009, 07:50 AM
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#16
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The Old Master
Trade:
Plumbing & Heating
Join Date: Jul 2009
Location: Allentown, PA
Posts: 90
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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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for a job that's up to "PAR"
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09-23-2009, 07:37 PM
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#17
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the pipe master
Trade:
plumbing, solar
Join Date: Oct 2008
Location: Central, Fl
Posts: 323
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To the OP:
3" lateral drain with 4" riser is the best.
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09-23-2009, 07:58 PM
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#18
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Fentoozler
Trade:
Professional Pie and Pastry Taster
Join Date: May 2007
Location: New Jersey
Posts: 5,589
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Quote:
Originally Posted by CookeCarpentry
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.
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<~~~~ Look at my "trade".
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The UD is quite possibly man kinds finest accomplishment.
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The Following User Says Thank You to Celtic For This Useful Post:
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09-23-2009, 08:02 PM
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#19
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Pro
Trade:
Siding, Windows, Seamless Gutters, Metal Roofing
Join Date: Apr 2006
Posts: 2,734
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just make sure the pipe dumps into your neighbors pond
__________________
Originally Posted by Celtic
Like I said...I'm sure you are very good at what you do ~ whatever that is and where ever it happens.
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09-23-2009, 08:02 PM
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#20
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Fentoozler
Trade:
Professional Pie and Pastry Taster
Join Date: May 2007
Location: New Jersey
Posts: 5,589
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Quote:
Originally Posted by Plumber_Bill
Read the code book!
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In case you missed it, I'm not interested in what the book says....I'm interested in the theory behind it.
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