Your home should always be comfortable, a clean attic and crawlspace is a good way to start. For this project we begun with cleaning both the attic and crawlspace. Once both where completely clean they sanitized this is important to get rid of all the bacteria. Then they rodent proofed sealing any entry points rodents might have access to. Then they installed R-38 batts insulation in the attic floor and R-19 batts on the walls.