how do so many small stones get onto roof’s?

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.

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Hunter D asked:

Whenever the rain pours heavily, there is a leak buildup in the center of the ceiling. The flat wooden roof is covered in tar and we can’t isolate the problem. Are there any good roof repair/leak sealing products, and are they easy to apply?

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