What Kind of Concrete Do I Need for a Shower Pan?

Learn the terminology for different concrete types. Concrete and cement are two different substances. Cement is the base ingredient in concrete, and concrete is a compound containing Portland cement and other components, such as sand, bits of rock or fiber. Portland cement is the default type of concrete, but not all concrete types work for all purposes. For shower floors, you need a concrete type called “deck mud” or “floor mud,” which is softer than the concrete used for walls and sidewalks. For shower curbs, you need “masonry mud,” which is a thicker version of the mortar used for bricklaying.

Assemble components for the deck mud. Deck mud or floor mud consists of five parts sand to one part Portland cement. Ideally, the mixture for deck mud should contain “sharp sand," which is made from crushed stone. Some builders and tile workers prefer deck mud with a higher proportion of cement (four parts sand to one part cement), but this mixture may clump when moistened.

Combine Portland cement and sharp sand in a large receptacle such as a wheelbarrow. Mix thoroughly to ensure the sand and cement are evenly distributed. Add just enough water to form a mixture that will form a solid, non-crumbly clump when you grab a handful. If your mixture is at the right consistency, you should be able to form a ball of it in your hand without your hand becoming wet or sticky.

Obtain masonry mud. This is a mixture of sand, Portland cement and lime, which helps the mixture cling to surfaces to which it is applied. Prepared masonry mud mixtures are available are building supply shops.

Mix the masonry mud powder with water; the mixture should be thick. Allow the mixture to rest for five to ten minutes before you use it.