Gravel roof is gravel on the tar, usually for flat roof. Cost a little more but can be repair partially. It need equipment e.g. pump molten tar to roof top.; V+ v' g# A3 _3 Q! }: E' D" e
Asphalt shingle roof last 15 to 20 years. Usually place on roof with slope. You can nail shingles to roof youself or with friends.