Topic
Some buildings have have rocks on the roof of it. Usually in big cities like chicago and new york. What is the reason for this?
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Some buildings have have rocks on the roof of it. Usually in big cities like chicago and new york. What is the reason for this?
Rocks (gravel) are for ballast, weight to hold the roofing material on, and to reflect heat and sunlight to prolong the life of the roof.
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