Rooftops

With BUR or Tar & gravel roofs, a layer of pea gravel is applied on top of the final coating of asphalt to protect the roof from the elements, including ultraviolet (UV) rays and hail. The gravel is embedded into the top coat of asphalt (known as a flood coat), which helps the gravel stay in place.

Aggregate is usually round rock, about a quarter-inch thick, and is used to impart the Class A surface burning designation in accordance with mandatory requirements for ASTM E108, UL790 or CAN/ULC S107M

Single-ply roofs are typically a simple, low-cost option, used mostly for very large commercial buildings.  Since nothing secures the waterproofing membrane to the roofing materials underneath, ballast is needed for weight to protect the roof from strong winds, UV and hail.  Ballast stones are usually one to three inches thick and applied more generously than on a built-up roof. 

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We can help keep this roof style choice even more desirable by providing a more cost-effective way to get the stones up on the roof and spread rather evenly at the same time.