Old drain is at least 45 years old and has broken under a concrete slab and roots get in and clog it up every 6 months. One estimate was for $3K, which includes breaking a concrete patio, installing new drain pipe and replacing patio.
There are 2 alternates that I thought about doing instead to keep from breaking up the concrete....
1 - Slide a PVC pipe inside the old terra cotta pipe. Advantage is lower cost, but it also makes the pipe diameter smaller.2 - Re-route a new drain pipe around the patio. This would be my first choice except that the only way is to go out 90 degrees from the original, which means either two 90 degrees bends -- or 45 degrees if that is available.
I posted a sketch the following newsgroup - the closest one I could find to plumbing...
alt.binaries.pictures.woodworking
If anyone has experience with this kind of situation, I would appreciate hearing a few words.
Thanks!
Bob