Spray Foam Attic Floor or Rafters: Which is Best to Insulate?
The first big pro to insulating the attic floor over the rafters is that when you measure out the square footage, you're going to have less almost every time when you're looking at the attic floor versus the underside of the roof. Your cost is directly related to how much square footage is being foamed. So obviously the attic floor is going to be the most cost-efficient option, especially if you have a steep attic or a complex roof design with multiple peaks. The biggest thin