Overview
The tile underneath decides whether an overlay works
An overlay works because of one simple fact: luxury vinyl plank does not bond to the room — it sits on, or bonds to, whatever is under it. When we install luxury vinyl plank over tile, the tile and its bond to the slab become part of the new floor system. A tile floor that is firmly bonded, flat and dry can be a solid, stable base. A tile floor that is already failing — hollow-sounding tiles, cracked grout lines, tiles that rock underfoot — passes those failures straight up, and the new planks flex, click and wear exactly where the old floor was weak.
Flatness is the second test, and grout joints are the usual problem. A click-lock plank needs a surface that runs flat across the room; wide or deep grout joints and lippage — one tile edge sitting higher than the next — can telegraph through thinner planks and stress the locking joints every time someone walks across. In our Jacksonville jobs, the prep for a sound tile floor is usually cleaning, checking every area by sound and by straightedge, and filling grout joints and low spots with a patching compound made for that purpose, so the plank sees one flat plane instead of a grid of dips. If the tile surface needs extensive leveling to get there, that prep work has to be weighed honestly against simply removing the tile.
Finished height is the third test, and it is the one homeowners most often miss. Tile already sits above the slab, and adding plank, underlayment or attached pad on top raises the floor again at every edge: exterior doors that must still swing and seal, the dishwasher that must slide out for service, the refrigerator, transitions into carpet or wood in the next room, and baseboards and door casings that meet the floor. In older homes in Mandarin, Southside and Orange Park we regularly find tile that was already laid over an earlier floor — a second overlay on top of that stack is where height problems turn from manageable to a reason to remove.
Cost follows those three tests, not the overlay idea itself. The drivers are the condition work the tile needs before a plank touches it — joint filling, patching, moisture checks on the slab areas we can reach — versus the demolition, haul-away and slab preparation that removal involves, plus the trim and transition work either route ends with. Skipping demolition saves that part of the scope only when the tile truly passes; paying for an overlay over failing tile is the expensive route, because the floor gets done twice. That is why the written estimate should name which route was chosen for your floor and why.
