Does anyone know about putting plywood over slab and possibly asbestos tile for hardwood , non floating ?
The asbestos tile you are referring to is undoubtedly a “VCT” type of tile. Shooting the plywood down with a ramset will give you miniscule exposure to the asbestos component, as it is encapsulated within the resins of the tile. If you were cutting it with a masonry saw and throwing fibers into the air…well that’s a whole different issue… don’t do it. The other option to consider is a product called “dry-core” which is a 2 x 2 osb panel with a tongue and groove edge on all 4 sides. The bottom has a “waffled plastic” covering that is moisture proof and gives a stand off from the underlying floor of about 1/”8. No nailing, no gluing. Once it’s down and locked together, you can install either laminate flooring or nail down hardwood on it. It runs about $1.50 square foot for the material. Lowe’s and Home Depot both should have it in stock.
