This used up a potentially great space for storage ... of your roof, your attic probably has either gable vents at the peak of the gables, eve vents at the eves where the rafters end, or possibly ...

whether on the attic floor or suspended from the rafters. If you have your furnace in the garage, the basement or a closet, you lose that space for storage. Attics are often left empty ...

In addition, warm air that escapes the living space will condense on rafters or roof sheathing in an unvented attic. "Frost accumulation can lead to mold in the attic, water stains on the finished ...