The easiest way to make your shower floor less slippery is to add traction by installing an anti slip shower mat.
How to make a shower floor.
Drive a nail into the floor every 8 12 inches 20 30 cm so the tar paper stays in place.
They re cheap easy to install and immediately add texture to your floor which significantly reduces your chances of slipping.
The shower in this project will be flush with the side of the whirlpool bath so the frame needed to extend under the tub overhang.
Lay a large sheet of tar paper on the entire floor of your shower pan and smooth it out as flat as possible.
Pour mud into the shower pan mixing it with a trowel as you go to get rid of air bubbles.
Get a professional plumber to rough in the shower drain before starting the concrete installation.