Understanding Home Insulation | Ask This Old House

In this video, what’s hidden inside your walls, helping keep your home warm in the winter and cool in the summer? Insulation—and the material you choose can make a significant difference. SUBSCRIBE to This Old House: http://bit.ly/SubscribeThisOldHouse. Drywall, framing lumber, and plywood provide relatively little insulation on their own. Filling the stud bays with insulation helps slow heat transfer, while…