Pecans are what I would consider tap rooted. Never seen one cause foundation problems. Ash, mulberry, and cottonwood come to mind there.
I would say live oak is not tap rooted. As far as their rooting in central TX, I would say it depends on soil. In clay soils of the blackland prarie to the east, rooting seems to be shallow these trees seem to be much more vulnerable to compaction/construction damage. Those just to the west, in the hill country seem to root pretty deep in the limestone of the Edwards Plateu as well as shallow. I have pushed them with a dozer and the seem shallow but have excavated sites and found roots 12 feet deep. Maybe it is a follow the water thing. In limestone, it is either just running off or percolating down. Anyway, live oak in the limestone is very construction/compaction resistant.
Pecan has no place being in someone's yard. It is a POOR urban lanscape tree. I don't care if it is the state tree. They belong in reprarian zones away fom people. If ya want nuts, head to the grocery store.
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