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Old 04-22-2017, 07:22 PM   #1
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Need watertight connection between 4" corrugated drain pipe and 4" PVC (sched 40)


I have a buried 4" corrugated drain pipe going under my patio (which drains water from a single downspout on the patio along with a surface water basin).

This pipe has a been crushed where it exits from under the patio below grade - there is a large hole in it. I have cut the pipe behind the damaged area and need to connect it to new schedule 40 PVC which will carry the water to daylight beyond the house.

I have it connected now with one of the Black drain pipe coupling connectors and it's fairly tight but it still leaks a fair amount of water at the joint. Since this connection will be only about 2 foot from the house and next to a 2 foot deep koi pond I'm constructing, I'm concerned about having a leak at that connection that may cause issues down the road with either the house or the koi pond.

Should I be concerned or will soil compaction around the pipe effectively hold back water seepage? If not, what would your suggestion be for getting as good a seal as possible there?

Last edited by homeimproverjoe; 04-22-2017 at 07:25 PM.
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Old 04-22-2017, 07:57 PM   #2
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Re: Need watertight connection between 4" corrugated drain pipe and 4" PVC (sched 40)


According to This Page there are adaptors available.
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Old 04-22-2017, 07:57 PM   #3
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Re: Need watertight connection between 4" corrugated drain pipe and 4" PVC (sched 40)


you need a adapter, maybe you can find one local
http://stores.drainageproducts.us/4-...-s-fabricated/
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Old 04-25-2017, 07:33 PM   #4
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Re: Need watertight connection between 4" corrugated drain pipe and 4" PVC (sched 40)


Here are the adapters I picked up, but I still have leaks occurring at this junction.



I also tried a 4 inch Fernco adapter but it won't fit over the corrugated pipe (fits perfect over the thick wall PVC 4 inch)



So, I'm considering using what I have (the two adapters in the first pic above) and sealing them up with caulk. If that will work, which of these would be best, BlackJack Roof Cement or Dap Kwik Seal?

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Old 04-25-2017, 09:11 PM   #5
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Re: Need watertight connection between 4" corrugated drain pipe and 4" PVC (sched 40)


Duct tape. The cloth type.
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Old 04-26-2017, 06:29 AM   #6
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Re: Need watertight connection between 4" corrugated drain pipe and 4" PVC (sched 40)


Not sure why the first adapter didn't hold. Hard to tell from here. Are both pcs sloped down? It's not evident from the pic.

Regarding using a Fernco fitting, not a bad idea, but you need the correct one.




https://www.doitbest.com/products/40...FVNMDQodiPsCXA



BTW - packing the fitting area with dirt, or caulk will not work.
And I would expect tape to work marginally better than dirt.
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Last edited by Yodaman; 04-26-2017 at 06:36 AM.
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Old 04-26-2017, 08:40 AM   #7
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Re: Need watertight connection between 4" corrugated drain pipe and 4" PVC (sched 40)


Quote:
Originally Posted by Yodaman View Post
Not sure why the first adapter didn't hold. Hard to tell from here. Are both pcs sloped down? It's not evident from the pic.
The black pipe is about level where it connects to the white PVC (which I have raised over the trench in the photo. The PVC has a slope of appx 1 foot every 8-10 feet.



Going to try to exchange my Fernco with the one in your pic and see if that does it.
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Last edited by homeimproverjoe; 04-26-2017 at 08:45 AM.
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Old 04-26-2017, 08:46 AM   #8
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Re: Need watertight connection between 4" corrugated drain pipe and 4" PVC (sched 40)


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Duct tape. The cloth type.
Doubt it would last a month.
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Old 04-28-2017, 05:37 AM   #9
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Re: Need watertight connection between 4" corrugated drain pipe and 4" PVC (sched 40)


I was able to get the pipe adapter at one of our HD stores. The lip on the inside of the adapter made it near impossible to get it over the corrugated irrigation pipe. In fact, I had to get my heat gun and soften the rubber up in order to get it past the first ring. However, once I did that, it sealed up very well. I did a watertight test and it held perfectly, no drips.

So, now that's behind me, delaying my project a few days, I can resume on building the pond and water feature that this piping will go under.

First a underground sandstone boulder, then a broken pipe, hopefully those are the last of the hidden surprises this pond dig has in store.

Thanks for the help and tips!

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Old 04-28-2017, 06:35 AM   #10
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Re: Need watertight connection between 4" corrugated drain pipe and 4" PVC (sched 40)


A squirt of dish soap helps those stiff rubber couplings also. Good luck with your project.
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