It depends on your comfort level and the type of insulation you choose. Foam board and fiberglass batts are common methods that are DIY-friendly if you have basic tools and a bit of know-how.

Mineral stone wool insulation batts are slightly better insulators than the off-the-shelf fiberglass batts sold at most lumberyards and home centers. Mineral wool batts for 2×4 walls have an R ...

Getty Images Carefully roll or lift fiberglass batt insulation, starting at one corner. For loose fill insulation, use the shop vac to suction the layer of insulation material into bags.

Looking for the best attic insulation? That answer depends on your definition of “best.” The best performing way to insulate an attic doesn't always align with the most cost-effective way.