|
|
|
|
| Author |
|
|
Throw it on the ground!
Join Date: Aug 2006
Location: Atlanta, GA
Posts: 2,562
|
Plumbing repair questions
Noticed a small wet spot on the ceiling and wet drywall on the wall below it. Cut out the drywall and discovered that the rubber coupling sleeve connecting the black PVC drain line to the cast iron drain pipe in the wall had failed. What is the advised repair? The house was built in 1985 and the cast iron pipe appears to be in pretty good shape. I currently
have replaced the rubber coupler and will allow every thing to dry and inspect for leaks before closing things back up but wondering if I should remove the case iron pipe and replace it with PVC. Wall location is first floor of two story house on a crawl space. I need to inspect connections below in the crawl to see if there are further problems down there. Are cast iron drain pipes still used in new residential construction?  
__________________
Mark 1987 911 Coupe Granite Green Metallic My Cousin's Wife's Sister's Husband is a Lawyer. |
||
09-30-2021, 05:30 AM
|
|
|
Navin Johnson
Join Date: Mar 2002
Location: Wantagh, NY
Posts: 8,765
|
Just replace the coupler.
Even a smaller plumbing supply house will have those couplers. Support local Cut that one of with a utility knife, slide the new down the CI, then up to the pvc (its ABS) and clamp
__________________
Don't feed the trolls. Don't quote the trolls  http://www.southshoreperformanceny.com '69 911 GT-5 '75 914 GT-3 and others |
||
|
09-30-2021, 05:47 AM
|
|
|
Registered
Join Date: Jul 2008
Location: New Jersey
Posts: 8,910
|
Quote:
|
||
|
09-30-2021, 05:52 AM
|
|
|
Friend of Warren
Join Date: Oct 2000
Location: Lincoln, NE
Posts: 16,483
|
Based on where the split in the rubber is, it looks like somebody over tightened the hose clamps on that coupler.
__________________
Kurt V No more Porsches, but a revolving number of motorcycles. |
||
|
09-30-2021, 05:54 AM
|
|
|
Non Compos Mentis
Join Date: May 2001
Location: Off the grid- Almost
Posts: 10,592
|
Taking out cast iron and replacing it with PVC is like selling your Aston Martin and replacing it with a Kia.
Nobody uses cast iron in residential because of the cost. Installed properly, it will outlast the rest of the house. |
||
|
09-30-2021, 06:15 AM
|
|
|
Kantry Member
Join Date: Feb 2001
Location: N.S. Can
Posts: 6,775
|
He has already replaced the coupler. His question was about the cast iron pipe.
I didn't know cast iron was still in use for residential in the mid '80s. If it ain't broke.... Best Les
__________________
Best Les My train of thought has been replaced by a bumper car. |
||
|
09-30-2021, 06:17 AM
|
|
|
|
Registered
Join Date: Jul 2008
Location: New Jersey
Posts: 8,910
|
Quote:
|
||
|
09-30-2021, 06:21 AM
|
|
|
Registered
Join Date: Jan 2002
Location: Long Beach CA, the sewer by the sea.
Posts: 37,623
|
Just make sure the model coupler you're using is designed and rated for CI to PVC. They are different than CI to CI.
Quote:
Last edited by Zeke; 09-30-2021 at 06:26 AM.. |
||
|
09-30-2021, 06:22 AM
|
|
|
You do not have permissi
Join Date: Aug 2001
Location: midwest
Posts: 39,830
|
Make sure it is supported. Cast iron is heavy all the way to the roof and the stack needs to be clamped to the structure.
__________________
Meanwhile other things are still happening. |
||
|
09-30-2021, 06:40 AM
|
|
|
Get off my lawn!
|
At my old house the kitchen cabinet had a small wet spot. I had to remove the cabinet that some previous owner installed, and found lead pipes for the drains. All the drinking water was new copper.
This was back in the 1980s and I was still almost funny to walk into a hardware store (before the big bog stores) and ask for a coupling for PVC to lead. I finally found an old school plumber shop that had the proper boot, and I fixed my problem, and put the cabinet back in. THe next person to remove it will like my screws and not the nails I fought with.
__________________
Glen 49 Year member of the Porsche Club of America 1985 911 Carrera; 2017 Macan 1986 El Camino with Fuel Injected 350 Crate Engine My Motto: I will never be too old to have a happy childhood! |
||
|
09-30-2021, 06:49 AM
|
|
|
Registered
Join Date: Apr 2011
Location: behind the redwood curtain, (humboldt county) california
Posts: 1,433
|
overtightening and alignment, (co-axial)
it looks like the abs fitting was not aligned with the cast iron, so when the clamps and the metal band were tightened, a lot of misalignment stress was placed in the rubber sleeve, leading to premature failure. overtightening only rxacerbates the problem.
the solution is to install a new coupler, carefully align it, then tighten. it is also helpfull to align the pipes, so that their center lines are the same. this may require adding a bit of abs, a coupler and elbow, if there isn't enoug wiggle room to get the alignment right. lastly, and least likely, make sure that there is no relative movement between the pipes - the rubber, being the most compliant will take the stress. cast iron, last time i checked, waslegal and used for sound controll. chris |
||
|
09-30-2021, 06:56 AM
|
|
|
Registered
Join Date: Jan 2002
Location: Long Beach CA, the sewer by the sea.
Posts: 37,623
|
Also expansion can play a part. The 90 above should be free.
Good point on the clamping, looks like the CI may have slipped. And everyone may not know this but there is a torque wrench made for couplers. Last edited by Zeke; 09-30-2021 at 07:15 AM.. Reason: add statement |
||
|
09-30-2021, 07:06 AM
|
|
|
|
Throw it on the ground!
Join Date: Aug 2006
Location: Atlanta, GA
Posts: 2,562
|
Thanks for the suggestions on the importance of alignment. Here are pics of the old coupler before removal and my first attempt at installing the new one. Definitely misaligned and even moreso in the after pic. Will reattempt. The OD of the ABS appears to me to be slightly smaller than the CI but I guess it could be alignment issues.
 
__________________
Mark 1987 911 Coupe Granite Green Metallic My Cousin's Wife's Sister's Husband is a Lawyer. |
||
|
09-30-2021, 08:04 AM
|
|
|
Registered
Join Date: Jan 2002
Location: Long Beach CA, the sewer by the sea.
Posts: 37,623
|
The OD's are different, that's why they sell a special model.
|
||
|
09-30-2021, 08:33 AM
|
|
|
Throw it on the ground!
Join Date: Aug 2006
Location: Atlanta, GA
Posts: 2,562
|
So I went to two different supply houses to look for what I thought was the correct part and no one had it but I did find a 3" Husky Sleeve that appears to have fixed the alignment issue with two straps on each pipe.
__________________
Mark 1987 911 Coupe Granite Green Metallic My Cousin's Wife's Sister's Husband is a Lawyer. |
||
|
09-30-2021, 12:59 PM
|
|
|
Registered
|
Question is, are you gonna leave an access port in case this one leaks ?
__________________
1986 Bosch Icon Wipers coupe. |
||
|
09-30-2021, 01:11 PM
|
|
|
Throw it on the ground!
Join Date: Aug 2006
Location: Atlanta, GA
Posts: 2,562
|
Quote:
__________________
Mark 1987 911 Coupe Granite Green Metallic My Cousin's Wife's Sister's Husband is a Lawyer. |
||
|
09-30-2021, 01:47 PM
|
|
|
You do not have permissi
Join Date: Aug 2001
Location: midwest
Posts: 39,830
|
Spray everything with 10% bleach. you know
__________________
Meanwhile other things are still happening. |
||
|
09-30-2021, 02:10 PM
|
|
|
Registered
Join Date: Jun 2000
Location: bottom left corner of the world
Posts: 22,700
|
The area of the cast iron pipe where the coupler goes would need to be clean and free of rust for the coupler to make a good seal.
|
||
|
09-30-2021, 04:08 PM
|
|
|
Registered
|
Can you support the joist above, cut out more of the top plate and lean the rise 3*
edit- your run seems to be a little short
__________________
Chris the more i learn, the less i know |
||
|
09-30-2021, 04:14 PM
|
|
Carrera
