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I have weil-mclain CGA-5 boiler, with 4 loops of radiant heat, and 2 loops of cast iron baseboard and radiator. The plumber installed the venting for me as picture shown, first section is 2 feet, second section is 4 feet, connecting to the chimney. before he use cement to close the hole, I am aware the 6 inch pipe is very close to very the end of chimney wall. the first and second section of 6 inch pipe is pitch at .25 inch per feet. Now the problem is there is water come out the floor after the boiler run. I do some research, it maybe condensation. Can anyone point me a direction how to fix this ? What is wrong with this setup ? thanks in advance.