All service pipe outside buildings, from the water Main to the meter, shall have a minimum cover of four feet (4') for pipe smaller than four inches (4") and a minimum cover of five feet (5') for pipe four inches (4") and larger. The cover shall be of earth and/or granular material. Service Lines in crawl spaces and unheated buildings shall be insulated from the point the Service Line starts an incline from this cover to the floor material where the meter setting is installed. The use of heat tape or similar products shall not be allowed.