I have spent a considerable amount of time investigating old termite damage to our living room floor above and to damage to the subfloor below, viewed from our basement. The previous owner repaired most of the damage to both, and put in a new floor joist, and I have finished repairing the tongue and groove pieces he didn't get to in the living and dining rooms. Unfortunately, about 10 separate subfloor pieces looked fine, but upon close inspection, are incredibly soft and rotted out. Over the past two weeks, I have tore out all 10-11 pieces of the subfloor. My question: Do I simply put in new wood (maybe 2" x 4"s) where the old ones were, and run them from joist-to-joist and support them with additional wood pieces along the joists? (It appears the previous owner did this in one spot. Why he didn't finish the job, I'll never know.) Sorry for the length of the question; I just wanted to be clear. Thanks!