Stones used to cover flat roofs are approximately ________ in size.

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Multiple Choice

Stones used to cover flat roofs are approximately ________ in size.

Explanation:
When ballast is used on flat roofs, the stones serve to anchor the membrane against wind uplift while evenly distributing weight. The typical ballast size is around the size of a golf ball to a baseball. This range provides enough mass to resist wind without being so large or heavy that installation becomes impractical or the surface could be damaged. Smaller sizes (pebble-sized) can be blown around too easily, and much larger (basketball-sized) stones would be unwieldy and risk damaging the membrane or flashing.

When ballast is used on flat roofs, the stones serve to anchor the membrane against wind uplift while evenly distributing weight. The typical ballast size is around the size of a golf ball to a baseball. This range provides enough mass to resist wind without being so large or heavy that installation becomes impractical or the surface could be damaged. Smaller sizes (pebble-sized) can be blown around too easily, and much larger (basketball-sized) stones would be unwieldy and risk damaging the membrane or flashing.

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