We want to do a seismic retrofit on our foundation. House built in 1904. No cripple wall. Mud sill with rim joist. Foundations have a recent skim coat (that we did not do). Concrete slab.
So the question: Is there a way we can test the foundations (without doing irremediable damage) in order to test whether the foundations are reasonably solid (for a 100 year old house). For example, drill a 1/2 inch diameter hole and see if the hole maintains its shape? Install an epoxy anchor bolt and see if it holds? Thx