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RE: Reinforced Concrete Tank Seal @ Exist.

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What you need is a retrofit waterstop. It's a T shaped waterstop that's
glued to the surface of the existing concrete, so you don't have to make a
sawcut. In addition to the epoxy, there is usually a thin stainless steel
batten that's attached on top of the flange of the tee and screwed into the
wall to strengthen the connection. I would suggest a chemical resistant
material if you are containing strong leachate. Check for the retrofit waterstop made by Westech.

-----Original Message-----
From: Ed Fasula [mailto:tibbits2(--nospam--at)]
Sent: Wednesday, January 26, 2000 9:12 AM
To: seaint(--nospam--at)
Subject: Reinforced Concrete Tank Seal @ Exist.

We have to add on to an existing concrete manure pit.  The local code allows
some leakage, but personally and professionally I'd like to avoid any
significant leakage at all.  

Common practice seems to be to cut a notch into the existing wall and create
a construction joint.  I would think doweling would be required as well.
There is a bentonite based sealant, RX, that is sometimes used.  It's not
recommended where the bentonite can, and apparently has, actually swelled
with enough force to crack the concrete.  

Any ideas about other directions would be appreciated.

Ed Fasula, EIT