Insulation showdown I’m selling a home in Deer Park built in 1978 and it needs more insulation. What kind should I use? Carolyn Your browser does not support the audio element. Tom: Fiberglass, formaldehyde-free fiberglass. That’s the insulation that I don’t have anything else but put in my homes. Got a question? Click here to ask Tom Related PostsBeating that summer heatAttic TipsShould I use Celbar or fiberglass insulation?Should I mix fiberglass insulation with foam?How should I insulate a storeroom floor?