Want to put a row of 4x4 ceramic tiles where there used to be Formica.
When the Formica was removed it took the top layer of the sheetrock with
it, leaving a rough gray-brown paper surface. Should that be primed
before setting the new tiles, or will the rough and somewhat porous
surface make for better adhesion?
Also, since the tiles have small projections that keep them from gutting
tightly together at the "front," do I still need to use spacers? It
seems to me that there will be plenty of space to fill with grout.
You should be fine with the surface. Just use pre-mixed mastic and a
small v-trowel ( I believe I used 3/16" or smaller last time), and
spread the mastic horizontally to prevent the tile from sliding down.
I also put up 4X4 tiles with jagged edges and I could not use spacers.
You pretty much have to do it by eye. I would lay some test tiles dry
and see what grout space looks best, then go from there. You don't
want too much space. Here are some pics of my backsplash. Grout space
is about 1/4".
Personally, I hate wide grout lines. I reason that I am paying for durable,
sealed and easy to clean tiles, why would I want grout lines, wider than the
minimum, that have none
of these benefits that I am seeking. To me, a 1/16" is great, 1/8" is the
maximum and 1/4" is ugly.
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