Built-Up Roof (BUR)

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.

Cons: Very heavy. Joists sometimes have to be strengthened. Smelly and messy to install. Installation's not recommended for occupied homes. It's not a DIY installation job, and it is hard to find the source of leaks. Gravel can clog gutters and scuppers. Seattle, Bellevue, Puget Sound and other areas of Washington State. Call today for an inspection.

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