What a bathroom wall actually is
Ceramic tile and grout
A hard glazed face interrupted every few inches by a recessed, porous line.
A glazed ceramic or porcelain face bonded to a substrate, with cementitious grout filling the joints between tiles. The glaze is dense, hard, smooth and non-porous. The grout is none of those things.
That contrast is the entire story of this surface. The tile face is the closest thing a bathroom has to an ideal adhesive substrate. The grout line running through it every few inches is porous, textured and set below the plane of the tile.
A pad wider than one tile is not bonded across its whole area. It is bonded to two tiles, with a void where it crosses the joint. That void is not a small loss of area; it is a loss of area right through the middle of the bond, and it is where peel starts.
Silicone caulk in the corners and along the tub line is a separate problem again. Nothing sticks to cured silicone reliably, including adhesives sold for tile.
Left column
What works on this surface
- Adhesive on a single tile face
- If the pad fits within one tile with clear margin all round, this is the best adhesive surface in the house. Clean off soap film first, because it is invisible when wet.
- Hanging mounts
- A shower arm through a tiled wall is already fastened into the structure, and hanging from it asks nothing of the tile at all.
- Portable, without reservation
- A tile floor takes a mat and a tile shelf takes a tray, and neither leaves anything behind beyond a patch that needs drying out.
- Freestanding units on a tiled floor
- The floor carries it. Watch for feet slipping when a loaded rack is pushed sideways on wet glaze.
Right column
What comes off with it
- Adhesive residue on the glaze
- Usually the whole extent of the damage, and usually removable with the solvent the manufacturer names plus patience. This is the good case.
- The surface layer of grout
- Where a pad has been pressed into or across a joint, removal can take the top of the grout with it, leaving a lighter recessed line.
- Silicone caulk, in strips
- Anything bonded onto caulk takes the caulk when it goes. Re-caulking a joint is routine work but it is work.
- A chipped glaze edge, if force was used
- Levering a stuck mount off a tile can spall the glaze at the edge. Once the glaze is broken the tile is open to water.
Taking an adhesive mount off ceramic tile and grout
On the glazed face of a tile, removing an adhesive mount usually leaves residue rather than damage, which is the best outcome any surface on this site offers.
It is not a guarantee. A pad that crossed a grout line can take the top layer of grout with it, a pad on silicone will take the silicone, and levering a stubborn mount can chip the glaze at its edge.
Follow the manufacturer’s removal method. Nothing here promises a traceless removal, and any listing that does is describing a perfect surface rather than yours.
What adhesive manufacturers say about it
Adhesive mount manufacturers commonly name smooth glazed tile as a suitable surface and commonly exclude grout lines, textured tile and silicone. Where a product states a cure time before loading, that period is stated for a reason. Read the instructions supplied with your product.
Every mount, on this surface
6 rows, one for each way a bathroom fixture attaches. Each verdict belongs to the row it sits on.
| Mount | Verdict here | What decides it |
|---|---|---|
| The best available surface, within a single tile | Across a joint the pad is only touching at its edges. Fit it inside one tile. | |
| Strongest hold, permanent consequence | A hole in a glazed tile is there for the life of the tile. | |
| Asks nothing of the tile | The load goes to the shower arm or the door, both already fixed. | |
| Fine, with attention to wet glaze underfoot | Steel feet on wet glazed floor tile slide when a loaded rack is shoved. | |
| Poor once the tile is wet | Friction on wet glaze is low, and over-tightening to compensate cracks tile. | |
| No consequence at all | Lift the mat, dry the tile under it, done. |
Working on this surface
- This site gives no drilling instructions for tile. Behind a tiled bathroom wall there are pipes and electrical runs, and a mistake there is a flood or a shock. If you do not know what is behind the wall, this is a job for a professional.
- Do not mount an adhesive shelf over the part of a tub where somebody stands, and do not mount one over the track of a glass shower door.
Work out what you can put up
The tool takes this surface, the kind of fixture, and whether it has to come down again, and returns a mount with the reason printed beside it.