Flat roofs usually come with a 10- to 20-year warranty but the roofs can last 25 years if properly installed and maintained.
To our commercial clients we off 24-hour emergency service and will even work on the weekends so the job is done on time and in budget! Thereafter we also offer various maintenance plans with regularly scheduled inspections insuring your roof and drainage systems are working and structurally sound.
The traditional hot-tar-and-gravel roof is built from three or more plies of waterproof material alternated with hot tar and ballasted by a layer of smooth river stone. Once made of tar paper, these types of roofs gradually are using more-advanced materials such as fiberglass membranes.
Pros: Gravel is an excellent fire retardant. Attractive for windows and decks that overlook the roof. It's the cheapest of the four roof varieties.