A baffle is simply a small piece of cardboard, plastic or PVC. They are small, but they can have major effects on your home. Baffles fit between the rafters and underneath the roof’s sheathing near the soffit vents. They keep the insulation from blocking the airflow into the attic. Baffles keep the insulation in place, which helps your home’s energy efficiency. Additionally, baffles will keep the homeowner from having to go up into the attic to reposition or replace insulation that’s blown out of place. However, that isn’t the only thing that baffles do. They’ll also help prevent moisture from collecting in the decking in the winter, and they will help keep your roof’s shingles cool in the summer by allowing the outside air to enter through the soffit vents, up and over the baffles and then out through the vents at the top of the roof.