HomeYouTube VideosShingles on a flat roof causes leaks Shingles on a flat roof causes leaks YouTube Video VVVwZ0xtWTBTSk5tZTFMaHF0RHJEMDh3LmZNT2IwZVlleW53 We have seen where a novice roofer will install shingles on a flat roof. Too low a pitch will cause leaks.