|By: Harry Dunbar
The kind of mortar used to build mortar beds for shower floors as well as floors in all other areas is called Deck Mud, Floor Mud, Dry-Pack or maybe some other terms I don't know about. But for now, we'll refer to is as Deck Mud.
In this illustration I have used 4 parts sharp sand and 1 part portland cement. It must first be mixed dry (before water is added) until it is all completely blended together, which will turn it all to a grayish colour.
This picture shows the brown sand under the light grey portland.