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how far does a concrete slab need to be from existing trees for a small building?
20x34 slab for a steel building. If we take out trees what about the existing roots? how clean does the property have to be to lay a slab?
If you take out the main trunk of the tree to about 3 or 4 feet below grade, the remaining roots from them won't cause problems. I like to fill and compact the soil at the excavation. Is your foundation engineered? I'd put beams about 10" wide and 24 or so deep, pouring them with the slab for a monolithic foundation. Depending on the soil report, you may want to put piers beneath each intersection of beams. I use piers 12" diameter, 15 to 25 feet deep depending on soil. You're spending a lot of money, I'd get the engineering done, and follow engineer's recommendations.
Generally, if the slab is beneath the drip line of a tree, the slab is on the roots -- drip line is about the same as extent of feeder roots. If you get on roots of live trees, the trees will drink water from beneath foundation, and the foundation will try to kill the tree. Some trees (several varieties of Oaks for instance) have a root ball dia which is about 50% wider than the drip line. Oaks are especially sensitive to having dirt added or taken from root covering.
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