This appears to be a form of roof ballast.
Why do roofs have rocks on them.
To weigh down or secure the roofing material as is the case with single ply flat roofs.
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Stuff i googled why do people have rocks on their roof 15 october 2011 at 07 11 reply also found some weird arizona thing about large rocks being placed on the roof to supposedly control the heat but i don t know if leave a reply cancel reply.
You can still find houses here in the city with rock roofs.
Why do roofing shingles have granules.
It s also a bit of an aesthetic nicety on more modern roofs just for the crack as it were.
Ceramic granules came along several decades later and offered numerous color options not previously available.
Have you ever wondered why contractors install gravel on flat roofs.
To protect the underlying layer of roofing materials as is the case with built up roofs burs.
I assume you re not talking about rocks meaning boulders but rather the layer of small stones you see not just on gas stations but on many flat roofs.
Admittedly one that i have not seen but i haven t been in the desert since i was a kid.
Granules were first added to shingles in the early 1900s and were primarily used for durability.
March 11th 2010 at 2 41 pm.
Gravel is used on flat roofs for two reasons.
Personally i dislike them.
My question is why do gas stations sometimes have rocks on the roof.