If your house is leaky, Lane recommends sealing with spray-foam insulation. “It saves on heating and helps with moisture getting inside,” he said. “It holds a lot better than the fiberglass insulation in most homes and can last more than 80 years.If your house is leaky, Lane recommends sealing with spray-foam insulation. “It saves on heating and helps with moisture getting inside,” he said. “It holds a lot better than the fiberglass insulation in most homes and can last more than 80 years.