Why won’t K&M put shingles on a flat roof, for instance a patio?
Because water runs downhill, and so do shingles! Shingles are designed to overlap. Water runs down, and is prevented from getting under the top of one shingle by the bottom of the previous row. If shingles were installed on a flat area, water would be able to back up under that bottom edge and leak into your home. Not only would this be bad for your wallet, but our license as well: local and state authorities have codes forbidding this type of installation.