cutting surface tree roots, weakens the tree?

I have some silver maples and a couple of ash's trees that the surface roots are really getting out of hand.
Will cutting them out weaken the tree, that is make is sickly or easier to blow over?
They are about 30-40 feet tall.
thanks.
Muffy
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Muffy Links said:

Yes. Maple and Ash have probably the most horizontal root system of all trees. You go cutting the big roots, and most likely the tree will die. Best not to bury them, either. The tree grows that way for a reason, and there's really nothing you can do to change it's habits.
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