Continue chiseling down to the waterproofing.
How to make a shower floor for tile.
The first is a single layer shower floor which can then be coated with redgard or a similar product or covered with kerdi to waterproof it.
Use a spade handle drill which works like a giant hand mixer.
Mix in water and more concrete mix following the manufacturer s instructions until the result is the consistency of a milkshake.
If not you can make your own mix with 4 parts sand to 1 part portland cement.
Properly built shower there are a couple of options to create a shower floor for tile using deck mud.
Create the concrete mixture pour concrete mix into a bucket until it s about one third full.
Use a 3 pound sledgehammer to hammer the tile until it s dislodged.
Slip a flatbar into that hole and under the mortar.
Here it is best to use premixed deck mud if it is available at your local home improvement store or tile shop.
Make the smooth surface of the tiles rougher to create more traction usually done by using an anti slip solution add anti slip treads or stickers cover the tile floor with non slip rugs switch to non slip floor tiles only recommended if you re planning a full renovation.