Spray in 'foam' is by far the best as it also seals any openings that would otherwise allow cold/hot air to enter. However, it is also more costly so you will have to consider the pros & cons. Be cheaper to place 'house wrap on the exterior to stop air leaks & use standard insulation batts. Let us know.
05:58PM | 03/16/02
One more thing you should know about foam: Some types of foam insulation will exert pressure on your walls when it expands and can possibly bulge or bow the surface of the walls.