 |
06-03-2008, 10:26 PM
|
#1
|
|
Newbie
Join Date: Sep 2007
Location: east coast
Posts: 10
|
drain trap
I need to repair the main drain line below the basement. It is an 8" clay "P-trap" Do I have to replace the P-trap with another p-trap or can I just use a length of straight pipe?
|
|
|
Warning: The topics covered on this site include activities in which there exists the potential for serious injury or death. DIYChatroom.com DOES NOT guarantee the accuracy or completeness of any information contained on this site. Always use proper safety precaution and reference reliable outside sources before attempting any home improvement task!
|
06-03-2008, 10:52 PM
|
#2
|
|
Journeyman Plumber
Join Date: Jun 2006
Location: Eugene, Oregon
Posts: 1,994
|
drain trap
If all fixtures in the house have a p-trap attached to them, then a house trap is not needed.
__________________
Fix it right the first time, so you won't have to fix it a 2nd time.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
|
|
|
|
|
06-03-2008, 11:45 PM
|
#3
|
|
Doing it myself
Join Date: Apr 2006
Location: Crescent City, CA
Posts: 3,422
|
drain trap
Quote:
Originally Posted by Ron The Plumber
If all fixtures in the house have a p-trap attached to them, then a house trap is not needed.
|
Also note : "I don't care who ya are, thats goin' to be disgustin' right thurr."
__________________
Journeyman Plumber
|
|
|
|
|
06-04-2008, 10:02 PM
|
#4
|
|
Newbie
Join Date: Sep 2007
Location: east coast
Posts: 10
|
drain trap
Thanks for the reply. I think the plumbing was done by the local 5th grade class. So maybe a main trap would be the way to go. Forgot, this house was once an orphanage. They had a dozen toilets in the basement once. the drains are still there in the ground, no traps on any of them. I tried to find a trap for 8 inches, no luck. Any suggestions?
|
|
|
|
|
06-05-2008, 12:54 AM
|
#5
|
|
Doing it myself
Join Date: Apr 2006
Location: Crescent City, CA
Posts: 3,422
|
drain trap
Quote:
Originally Posted by kadgar
Thanks for the reply. I think the plumbing was done by the local 5th grade class. So maybe a main trap would be the way to go. Forgot, this house was once an orphanage. They had a dozen toilets in the basement once. the drains are still there in the ground, no traps on any of them. I tried to find a trap for 8 inches, no luck. Any suggestions?
|
You won't find any traps on those toilet lines, since traps for toilets are integrated into the bowl themselves.  
If they are not currently being used for toilets, they should be capped in some manner if you are going to remove the 8" trap....
__________________
Journeyman Plumber
|
|
|
|
|
06-05-2008, 09:19 AM
|
#6
|
|
Member
Join Date: Sep 2006
Posts: 1,670
|
drain trap
I have never quite understood the reasoning for "house traps" since they are usually on the sewer main side of the house plumbing. This would indicate that they are not vented and could have the water sucked out with any flow in the main sewer line. Toilets do not have a trap under them since it is built into the bowl. Double trapping is illegal in most Plumbing Codes.
__________________
If you have never made a mistake, you haven't done much.
|
|
|
|
|
06-05-2008, 10:23 AM
|
#7
|
|
Doing it myself
Join Date: Apr 2006
Location: Crescent City, CA
Posts: 3,422
|
drain trap
Quote:
Originally Posted by majakdragon
I have never quite understood the reasoning for "house traps" since they are usually on the sewer main side of the house plumbing. This would indicate that they are not vented and could have the water sucked out with any flow in the main sewer line.
|
Didn't they used to put a large end of line vent on those types of systems 'back in the day' ?
__________________
Journeyman Plumber
|
|
|
|
|
06-05-2008, 11:11 AM
|
#8
|
|
Member
Join Date: Sep 2006
Posts: 1,670
|
drain trap
That may be true. The few that I have seen were outside the foundation and no vent past them to make it work properly. Every Code I have worked under requires a trap for each fixture (including a washer drain) so in my mind, a House trap would constitute double trapping. In Ohio. to get a Plumbing Regulation changed (drainage type) they built a system in glass pipe. It was then tested 100 times and if there were no failures, the code was changed to allow it. When I first strated my apprenticeship, you could only run 20% of vent lines horizontal. After testing this, it was changed so the only requirement was proper slope and it had to exit through the roof.
__________________
If you have never made a mistake, you haven't done much.
Last edited by majakdragon; 06-05-2008 at 11:14 AM.
|
|
|
|
|
06-06-2008, 10:19 AM
|
#9
|
|
Doing it myself
Join Date: Apr 2006
Location: Crescent City, CA
Posts: 3,422
|
drain trap
Quote:
Originally Posted by majakdragon
That may be true. The few that I have seen were outside the foundation and no vent past them to make it work properly. Every Code I have worked under requires a trap for each fixture (including a washer drain) so in my mind, a House trap would constitute double trapping. In Ohio. to get a Plumbing Regulation changed (drainage type) they built a system in glass pipe. It was then tested 100 times and if there were no failures, the code was changed to allow it. When I first strated my apprenticeship, you could only run 20% of vent lines horizontal. After testing this, it was changed so the only requirement was proper slope and it had to exit through the roof.
|
Our code says that building traps are not permitted anyhow. 
__________________
Journeyman Plumber
|
|
|
|
-->
| Thread Tools |
Search this Thread |
|
|
|
| Display Modes |
 Linear Mode
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
|
|
