This is a mixture of cement fine grain sand and water that will adhere the new tile to the old.
How to install tile shower floor over concrete.
Lay a level on the old tile and mark any high spots.
It will also provide a stronger adhesion between mortar and concrete.
If anything it would be difficult to screw the cbu into the concrete especially with the middle layer of thin set.
Lay a set of tiles along the lines without adhesive to dry fit a row.
This is an optional step but can really benefit your tile installation in the long run.
A concrete sealer prevents moisture from staying underneath the ceramic tiles.
When working with the wet concrete strike it gently with the flat side of the trowel to help bring the moisture to the surface and smooth out the concrete.
Step 3 plan your layout.
Whether you ll be installing tile over your shower s concrete floor or leaving it bare you will need to use a mixture called deck mud to form the shower s base.
In short installing cement board between concrete and tile is possible.
Most tile professionals agree that attaching a cbu to a concrete floor would be more trouble than it is worth.
The height of the concrete should gently slope from 2 1 2 around the outside of the form to 1 1 4 near the drain.
Pre slope is required in order to allow water collected on the shower membrane to drain into the weep holes of your shower drain assembly.
The next step is to apply a concrete sealer on the floor surface.
Roughen the tile with 80 grit sandpaper.
Grind them down with a grinder.
If your old ceramic tile is worn or dated you can lay new tile right over the old and avoid the huge job of tearing out the old tile.
Use a thin set product to install ceramic tile over existing tiles.
Pour the concrete and spread it out with a trowel.
When it comes to mortar latex or epoxy options are best for installing tile over tile.
Pick up the tile nearest.
Deck mud also known as floor mud or dry pack mortar is a simple mixture of sand portland cement and water.
Remember tile and mortar are not waterproof.
Using concrete mix create a 1 4 per foot slope to the shower drain.
Install tile over concrete 1 dry fit the ceramic tiles on the floor.