10:27AM | 08/05/07
Member Since: 08/04/07
1 lifetime posts
I want to use ceramic tile in an outdoor patio 6' x 10' over existing concrete. Concrete is level and in good shape. I've powerwashed all dirt and grime but concerned about using mortar. What should I use to secure the tile?


05:58PM | 08/05/07
Member Since: 07/03/05
283 lifetime posts
you should use a modified thinset, no premix junk that comes in a bucket.

The bigger issue is, do you live in an area that has freezing weather? If so, a porcelain tile must be used as they do not absorb moisture and therefore wont crack in a freeze/thaw weather condition.

The cement slab must also be free of cracks and any sealers or paint that would inhibit the bond of the thinset to the slab.


07:14AM | 08/06/07
Member Since: 10/28/05
312 lifetime posts
this should also have a cleavage/uncoupling menbrane.

I recommend schluter ditra or troba, with the possibility of using bara depending on your exact situation.

not only is freeze/thaw stability a concern, but also there can be the different rates the different products with expand and contract with the drastic changes in temperature that occurr in exterior applications. From day to night, from hot to cold, from rainy to snow and ice. Its quite possible you can have a variance of 20-50 degrees in a frew hours transforming from cool darkness to a hot humid sunny day, especially so with a darker tile that can really pull in the heat from the sun and hold it.

Also, conrete will expand at a different rate than the tile, thinset, and grout, so that cleavage/uncoupling membrane acts as a buffer between the tile /setting-bed, and the substrate.

Lastly, if going up and fitting to, or grouting against any verticle obstructions (walls posts, etc), you will want to use a color matched grouting caulk, not grout.

here is some more information:

Schluter Ditra:

Scluter Troba:

Schluter Bara:

Whitepaper: Essential Water Management in Tiled Installations:

Color Matched Grouting Caulk:


There are two ways to do any job.

The right way and the wrong way.

Do it right everytime.


Click to reply button
Inspiration banner


Post a reply as Anonymous

Photo must be in JPG, GIF or PNG format and less than 5MB.

Reply choose button


Post new button or Login button

To test the boundaries of small-footprint living, interior designer Jessica Helgerson moved her family to a 540-square-foo... Filling an underutilized area beneath the stairs is a smart way to save space. Doing so with a stash of wood, however, is ... The Audubon Society inspired wallpaper in this Adirondack-styled mudroom will get you in the outdoor mood. Grab your coat ... Chalkboard paint opens up endless possibilities for customizing your dresser time and time again. Use chalk to label the c... A fireplace in the bathroom creates the ultimate setting for relaxation. Homeowners often choose electric or gas over wood... This roomy boot tray made from punched metal stands up to all the elements. Station it in your mudroom or at your back doo... There’s nothing like a new set of cabinet hardware to refresh a room. The possibilities are endless: Go modern, rustic, or... FLOR tiles are an affordable way to customize a carpeted floor covering for any space. Make anything from runners to wall-... Chalkboard paint features prominently in this elegant yet unpretentious headboard design. Add a new message daily to reflec... Salvaged boards in varying widths and colors make up the dramatic accent wall in this attic space. The high-gloss white of... The indecisive homeowner need not fret over choosing one (or even two) cabinet colors. The kitchen cabinets in this artist... Incorporate nature into your lighting scheme by securing a dead tree in a concrete mold and draping your pendant lamp from... Simple and striking, a couple of pieces of "lovingly used" furniture creates a special kind of charm. A weathered chair fo... First dress up your metal shelves with a coat of paint in an accent color that complements your kitchen decor. Then arrang... Dark wood shelving and a matching upholstered bench keep this closet sleek and refined. The large window brightens the sub...
Follow banner a
Newsletter icon Flipboard glossy Facebook Twitter Pinterest Youtube Rss icon