The floors on the addition are wood -- actually carpet over a plywood subloor. I think glue and screws were used on the plywood, so I cannot lift it up easily. Electrical boxes are mounted in the floor, and the floor outlets have the brass crew-on covers.
The addition was built between the main house and a detached garage, connecting them together. The walls on the garage and main house are brick over masonry construction.
The foundation wall could be cinderblock with a brick facing -- I guess that's likely, but I don't know. Ductwork and wiring fills up the only connection between the main house and crawl space.
How do I cut holes in the foundation walls, assuming it's a good idea to provide vents for the crawl space? Thanks, Kerrie