Can you install tile on top of wallboard?

Question

Hi --
I would like to put some ceramic tile above a backsplash behind my stove. This would be the area above th formica backsplash, beneath the kitchen hood and underneath the adjoining cabinents.

My thought is to lay the tile directly on the wall - which is a combinations of plaster, and built up wallboard (very smooth and even), with the edges trimmed in bullnose tile.

I really don't want to add the 1/2 inch for backerboard or rip the plaster out to get the joists.

How well would it work laying the tile directly onto the old plaster and built-up wallboard?

Thanks.

Answer 1

It will be just fine to do

Answer 2

The idea of the cementboard or backerboard is to give the tile a stiff, rigid, waterproof surface to adhere to. On a floor, I'd say it's a must. For a wall like you describe, I'd say maybe, but only if:

1) You clean the surface VERY well - any grease at all here will affect how well the tile adheres. That means you're going to have to scrub the whole areavery well, especially around the stove and sink.

2) you be sure to use a high-grade waterproof grout, and you seal it well initially, and you re-seal it periodically.

3) you caulk the joint at the bottom, where the tile meets the countertop, to prevent any moisture on the countertop from getting through.

4) you accept the possibility that it may still not work, and at some point you may have to replace tiles that pop loose, or tear out the entire job and do it with cementboard.

You're going to be looking at this area for years, wondering if it's going to hold. If this is a DIY job, It'll only cost you a few extra dollars for cementboard. The labor to tear the drywall out and put up the cement board won't cost you a thing.