The old vinyl tile you describe sounds like vct vinyl composition tile and it is tough stuff.
Thinset to go over vinyl.
Under that i found some green 12 vinyl squares good condition which appear to have been stapled directly on the plywood subfloor of at least 1 1 8.
Apply a layer of thin set tile adhesive to the vinyl using a notched trowel.
Btw the shot blasting has a collection vacuum and i would hire a company to do the removal if i choose to take that path.
But it says right on the thinset label ost all of the mainstream manufacturers of tile thinset mortar adhesive offer a product that clearly states on their label that their product is suitable for installation of tile over vinyl flooring.
I ll consider both options.
Darn near impossible to get up.
Exposed areas between ridges of adhesive should expose the vinyl flooring.
Sheet vinyl is sometimes generically and incorrectly referred to as linoleum.
However as with all tile installations the entire subfloor below the tile is important not only the layer to which the tile is bonded.
Most manufacturers of tile cement thinset have developed a specialty thinset for setting tile that bonds well to sheet vinyl.
Trowel on thin set adhesive.
Shot blasting and thinset that will go over it.
And there are lots of em.
To tile over sheet vinyl the following is generally recommended by most.
Apply thin set adhesive to the vinyl flooring with a notched trowel.
Vacuum the floor to make sure there isn t any debris and mix the thinset.
Their glue will stick to vinyl.
However sheet vinyl is a resilient type of flooring and is different than linoleum.
Archive type of thinset to use over a lino floor tile forum advice board.
When tiling over vinyl flooring on a wood subfloor you should apply a layer of 1 2 thick cement backer board first.
Some of us think what you re doing is a really bad idea even with a thinset mortar that will stick to the vinyl.
Be careful because thinset sets very fast.
Here s how to go about it.
Spread the thinset using a notched trowel in one direction and set the backer board.
To do this scoop a small amount of thin set adhesive onto the floor then drag the edge of the trowel over it to cover the floor.
When installing new stone ceramic or porcelain tiles over a vinyl tile subfloor thinset is definitely the way to go.
The trouble is that thinset generally requires a textured surface to bond at.