Hello, I'm new here. Please be gentle. I now own a 101 year old home in Grosse Pointe Park, Michigan. I am currently working, as the season begins here, on balancing the system and ensuring I have proper air venting. Its a 2015 222000 BTU Utica boiler attached to 100 year old hydronic pipes. My biggest question about my system is why are nearly all the radiators run off the downhill condensate or return line? I thought that return lines shouldn't be charged with steam, but if my system is charging all its radiators, then steam must run all the way through, downhill, confirmed with a level, to 4 feet from the Hartford loop on 3 different loops, front of house, back, and addition 2nd floor. Also, all the insulation has been removed from my basement lines. I need a good source of fiberglass roll and covering and mastic in the area or online. I saw a great house in Dayton Ohio with proper fiberglass coverings taped and mastic'd on this forum, but I was at work and I've lost the link. Help me…