My house was built with 1.5, 2.0 and 4.0 dia copper drainpipe in the walls and 2.0 & 4.0 dia cast iron pipe through the basement floor. after several leaks I would like to replace the copper with plastic, although there may be sound issues. My question are:
1) How do I join the plastic to the cast iron that is just above (1/4") the concrete floor in the basement?
2) What is the better plastic product to use?