Capt2

I have a water main coming through a poured concrete foundation. THe copper pipe main is encased in a black plastic sleeve. When it rains water comes in through this sleeve.

Can I fill the end of the sleeve with hydraulic water stop cement? I'm hearing conflicting info on whether the cement will hurt the copper pipe inside.
Feedback appreciated. Thanks

concretemasonry

Hydraulic cement is great when it comes to fixing leaks is concrete.

Your leak in the area between the copper and plastic.

Prep and clean the void completely using water and alcohol. If the gap is large use a bakker rod. Caulk with the best caulk that you can find that will adhere to both the copper and the type of plastic you have for the sleeve.

__________________
Dick

Engineer, designer and consultant recently active internationally on construction and design in about 35 countries.

Tscarborough

NP1 sealant will work fine, but you will have to prime the metal (for the application above). Edit-it is 733 primer.

Capt2

I used marine grade epoxy putty. I'll see the result next time it rains.

Tscarborough

Which one? Some will not create a watertight bond to copper, some will.

Capt2

It's Locktite 5 min epoxy. It comes in a cylinder that you break a peice off of and knead it together to mix the 2 parts.

Teetorbilt

3M 5200 slow cure. This stuff sticks to anything including you. Mineral Spirits is cleanup unless it cures.

__________________
You can't solve you're problems with the same level of thinking that created the problems.

Albert Einstein

Tscarborough

5200 is as close as humans will come to being God: On the 8th day, God said, "glue it together", and 5200 appeared on the face of the Earth.

Teetorbilt

Then He created EPOXIES!

__________________
You can't solve you're problems with the same level of thinking that created the problems.

Albert Einstein

Capt2

OK so we had heavy rain in NJ and I had used the marine epoxy putty before it started. Basically it held temporarily then started to leak. Just out of curiosity I applied this rubbery gutter sealant that can be applied when wet and bingo, it worked no more leak.

Now if I can just get the other little foundation leaks stopped.
What is the trick to using hydraulic cement??? Can it be applied while the leak is active? I did this and the leak wiggled its way to the edge of the cement.
Feedback appreciated.

Tscarborough

It can be used (hydraulic cement) only under pressure when you are applying it to the positive side of the pressure.