how do so many small stones get onto roof’s?
Tuesday, June 30th, 2009 at
4:07 am
nolbert asked:
If your ever high up on a roof, flat or angled, you’ll find small stones up there, sometimes thousands or millions of them..Ive made roofs before and when i go up to do any repairs etc years later, you can almost guarantee youll find lots of rocks up there,even when theres no source for small stones nearby!
Is it the rain or wind carrying them? or maybe something else?
Its puzzled me for years.
Tagged with: Rain • Rocks • Roofs
Filed under: Physics
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animals carry stone onto rooftops
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it could just be the shingles breaking apart
or the thousands of small meteors that hit the earth each day
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The stones are pea gravel, and are part of the roofing system. The stones prevent the ultraviolet from the sun from degrading the asphalt roofing material underneath.
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Birds often scoop up insects, seeds, and other foods and grab some gravel or small rocks in the process. They fly up there to eat and drop the small rocks. Over the course of years, it can be thousands of small rocks.
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They are put up there on purpose. My grandmother in Florida has a roof with rocks on them. Pebbles really
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rodents and birds often take stones with them from the ground. birds particularly like to move small rocks around. unless they are fine grained sand size particles of rock the wind is normally not enough to move them.
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you have dozens of blind neighborhood kids who find it funny to throw stones at other peoples homes. apparently they cant hit your windows so they end up on the roof.
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Wind, birds, possibly squirrels, especially if you have a tree or trees surrounding your house. Think of all the severe weather we can have – especially over the winter. Where I live, it’s extremely windy in the winter with freezing temperatures. This harsh wind from which we are sheltered in the winter can definitely have an impact on your roof. Most of us don’t bother to go up on the roof during this time of the year. Meanwhile, the snow melts, and the wind calms as spring arrives – usually. That’s when we go up there and see mother nature’s remains of winter. This doesn’t apply if you live in a tropical climate. If this is the case, then it’s from just birds, wind, and squirrels.
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Wow! I like ALL the other answers! But did you ever consider what happens to the stones that didn’t stay on the roof? They must have rolled off (or the wind blew them off) onto the ground! Just find a bare patch of ground under the eave of any roof and dig down into the dirt a few inches and you will find zillions of small stones buried there!