Drive a nail into the floor every 8 12 inches 20 30 cm so the tar paper stays in place.
How to make a shower floor.
Also make sure your floor is pre sloped before installing the rubber liner in the following steps to prevent.
They re cheap easy to install and immediately add texture to your floor which significantly reduces your chances of slipping.
Pour mud into the shower pan mixing it with a trowel as you go to get rid of air bubbles.
Lay a large sheet of tar paper on the entire floor of your shower pan and smooth it out as flat as possible.
Get a professional plumber to rough in the shower drain before starting the concrete installation.
Diy step by step instructions on how to build a mortar shower pan.