Can You Tile Over Concrete Expansion Joints

Once youve ascertained that the slab is dry and level as possible your best solution to lay tile over concrete with expansion joints is shown below and linked here. Youre concrete either has expansion joints cold joints or control joints in it already- or it doesnt.

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If there are joints in the concrete slab under the tile there needs to be an expansion joint in the concrete slab as well.

Can you tile over concrete expansion joints. Recognizing that tile is a facade movement joints are needed to eliminate stresses that can occur between the substrate and the tile due to differing amounts of expansion and contraction. Tile over expansion joint No membrane or installation system is designed to bridge any joint with verticle displacement. This time talking office floor and 12 x 12 ceramic tiles.

However depending on the tile size and system up to 14 movement is possible on the horizontal. While you can install tile directly on concrete problems erupt when the concrete cracks or shifts. Use an elastomeric caulk with a backer rod or bond-breaker tape to prevent three-sided bonding of the caulk Figure 6-37 below.

Two great products for this are Schluter Ditra comes in rolls and works very well over concrete or Laticrete blue 92. Directly over any expansion control construction or cold joint Expansion joints should be at least 14 inch wide and free of grout backerboard or tile adhesive. Once youve ascertained that the slab is dry and level as possible your best solution to lay tile over concrete with expansion joints is shown below and linked here.

Otherwise the movement that those joints allow in the slab could carry up into the tile and compromise your installation. Painted concrete can be made porous with sandblasting or other hard abrasive actions. Tiling Over Concrete Expansion Joints If the concrete is stable and fully cured--you can tile over this but you need to provide a slip membrane beteen the concrete and the tile.

Where should movement joints be placed. This joint would NOT be grouted but would be filled with a matching acrylic caulk. Tile cannot be attached directly to painted concrete as the thin-set will not adhere well to the paint.

This sentence means that when tile is installed on a concrete floor which contains expansion joints a sealant joint aka caulking joint must be placed in the tile installation immediately above the joint in. If it is a true expansion joint tile should not bridge it. You can fill expansion joints with a joint filler that can expand and contract with the concrete.

Although tile can be placed directly over a concrete slab products such as Schluters Ditra are designed to separate or uncouple the tile from any potential movement in the substrate and protect the tile and grout from cracking. Or is it fine because they used this stuff. I can see your concrete contracting in the winter months and then expanding in the summer.

If its new concrete then maybe it should have control joints in it. Tiling over concrete is fine if its in good shape with no sealers or bond breakers on it. As you pour each slab of concrete stop and place your joint in between each slab.

So for a 4 thick sidewalk youll cut 4 expansion joints. The RedGard Uncoupling Mat covers small cracks in the concrete slab and eliminates the worry of installing over those expansion joints. You will need to put some sort of material in the bottom of the joint typically called backer rod which is a premolded plastic piece that you shove in the bottom of the joint or I have seem fiber board or wood used as well.

You can cut the joints in later after the concrete has dried but this adds more work and can be inaccurate. That is you need a joint in the SLC and soft joint in the tile over the concrete jointexcept when using NobleSeal the joint in the tile does not need to be directly over the SLCconcrete joint. But for movement joints those should be in the tile.

The TCNA Handbook recommends allowing for expansion and contraction in every tile. 18 movement with any sheet system typicallyand 116 with a few trowel-on systems. OT- Tile over concrete floor and expansion joints This time talking office floor and 12 x 12 ceramic tiles.

But if they arent in it at this point then putting them in later does no good. If it is a saw cut or tooled joint there are membranes that allow tile to bride them. A joint trowel tool can be used to ensure there is a space between each slab.

I would lay ceramic tile with a 14 inch space directly over the expansion joint. Make a note of where your outdoor tile expansion joints will. On the one hand one would think the tile joints should be lined up with the expansion joints in the concrete floor but on the other hand I suspect that is rarely actually done and all is fine.

This would still allow for some concrete movement without cracking tile or Grout. Tile can contribute thermal mass to a passive solar house and to Christa Campbell it would make a more appealing finish floor than concrete. The concrete control joint needs to be honored through to the top of finished tile.

On the one hand one would think the tile joints should be lined up with the expansion joints in the concrete floor but on the other hand I suspect that is rarely actually done and all is fine. The RedGard Uncoupling Mat covers small cracks in the concrete slab and eliminates the worry of installing over those expansion joints.

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