Dec 2, 2016 - Three types of insulation are used on the exterior of basement walls: rigid mineral wool boards, high-density polystyrene (Type IV) and . Jump to Choosing a Type of Insulation - R-value will help you choose the level of insulation that you'll need. There are many basement insulation . Jan 4, 2018 - The most commonly used insulation materials in the basement include spray foam, fiberglass, and foam board. In older homes, the basement many times is left uninsulated. This allows air from the outside to get into the rim joist, basement ceiling, and exposed walls. Jun 29, 2012 - Here at GBA, we regularly receive questions from readers about the best way to insulate a basement wall. Since these questions pop up . The basement is one of the most important areas of your home to insulate properly. It's often the most musty smelling, draftiest room in the house. But it doesn't . Basements are the perfect location for foam type insulation products. Cellulose is also an option for basements but it's not a product that I'll cover here. I wrote . While most homeowners understand the importance of insulation, they often overlook one of the greatest areas of winter heat loss - the basement or crawlspace .