Most homes built in the fifties here did not insulate their piping. By the fifties people realized asbestos was dangerous, by the late 70's it was illegal to make many products out of asbestos. Plus the people thought "why would I pay to insulate piping if I'm trying to heat the house?"Homeowners can abate asbestos in lowa then it ends up land fills. Asbestos in the 50s and 60s was in everything. Floor and ceiling tile, pipe covering, fire brick, plaster, vermiculite insulation and boiler cement just to mention a few things.