[jorian]

Go with the epoxy coating. A friend who owns a large plumbing company brought this technology over from Europe about 7 years ago. It has been used in Europe for nearly 25 years with great success. It costs less than 25% of a conventional repipe and can repair a 2" hole in a 4" pipe. I have a 50 year old building with 13 suites that is going to be done in the fall. They bring a compressor on-site, turn off the water, scope the pipes, blast air through the lines to dry them and then coat the inside of the pipe. This can be done by one guy in one day. The coating is very thin and doesn't significantly reduce the inside pipe diameter. It is totally non-invasive and is guaranteed for at least 10 years. Tenants aren't displaced and drywall is left intact.