Four Inch Drain Changes To Three Inch - Plumbing - DIY Home Improvement | DIYChatroom


Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Plumbing

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Display Modes
Old 07-09-2013, 07:42 AM   #1
Lord of Slums
 
Join Date: Feb 2013
Location: Detroit Mi
Posts: 809
Rewards Points: 640
Default

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?

Advertisement

mj12 is offline   Reply With Quote
Old 07-09-2013, 08:24 AM   #2
Master Plumber
 
Javiles's Avatar
 
Join Date: Dec 2011
Location: Miami Florida
Posts: 1,465
Rewards Points: 718
Default

Four inch drain changes to three inch


A drain can never be reduced.

Advertisement

__________________


Experience is Knowing what to do next, Skill is knowing how to do it

http://www.americandrain.net
Javiles is offline   Reply With Quote
Old 07-09-2013, 05:27 PM   #3
Lord of Slums
 
Join Date: Feb 2013
Location: Detroit Mi
Posts: 809
Rewards Points: 640
Default

Four inch drain changes to three inch


Now this is in a very urban area, how in the world did that ever pass inspection?
mj12 is offline   Reply With Quote
Old 07-09-2013, 05:54 PM   #4
Member
 
Join Date: Mar 2013
Location: Ohio
Posts: 2,601
Rewards Points: 1,746
Default

Four inch drain changes to three inch


Quote:
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.
Ghostmaker is offline   Reply With Quote
Old 07-09-2013, 05:55 PM   #5
Member
 
Join Date: Mar 2013
Location: Ohio
Posts: 2,601
Rewards Points: 1,746
Default

Four inch drain changes to three inch


Quote:
Originally Posted by Javiles View Post
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.
Ghostmaker is offline   Reply With Quote
Old 07-09-2013, 09:59 PM   #6
Master Plumber
 
Javiles's Avatar
 
Join Date: Dec 2011
Location: Miami Florida
Posts: 1,465
Rewards Points: 718
Default

Four inch drain changes to three inch


Quote:
Originally Posted by Ghostmaker View Post
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.

Advertisement

__________________


Experience is Knowing what to do next, Skill is knowing how to do it

http://www.americandrain.net
Javiles is offline   Reply With Quote
The Following User Says Thank You to Javiles For This Useful Post:
ben's plumbing (07-09-2013)
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Is PVC too brittle in cold for drain under a paver patio? BrandonC_1972 Landscaping & Lawn Care 1 07-20-2012 01:18 AM
Paver patio/wall corrugated drain location BrandonC_1972 Landscaping & Lawn Care 0 07-05-2012 12:31 AM
washing machine drain issues lost_punk Plumbing 2 06-19-2012 11:18 AM
Condensor drain Captflx HVAC 6 08-17-2008 11:19 AM




Top of Page | View New Posts