How to Install a Deck Mud Bath

"Deck mud" or "deck mud bath" is another name for the mortar-based barrier you create between the subfloor of a shower stall and tile. A dry mortar mix is used to make a durable, long-lasting and waterproof barrier that prevents water from leaking to the subfloor. Installing a deck mud bath is a simple process that allows you to create your own shower pan utilizing simple supplies and tools found easily at the hardware store.

90 lbs. dry mortar mix
Wheelbarrow or large tub
Small shovel
Roofing felt
Mesh
Construction stapler
Trowel
Level
Measuring tape
Wooden float

Instructions

- 1
  Pour 90 lbs. of a sand and cement-based dry mortar mix into a wheelbarrow or large plastic tub. Choose a mix that consists of 75 lbs. of sand and 15 lbs. of cement, a ratio of 4 to 1, or you can make your own dry mortar mix with the same ingredients.
- 2
  Add 1/2 gallon of water and begin to mix the ingredients with a small garden shovel. Add more water, if needed, until the deck mud packs firmly in your hands without any water squeezing out of it.
- 3
  Lay the pre-cut roofing felt on the shower subfloor. Place the mesh over it. Secure the two layers to the subfloor with construction staples.
- 4
  Pour the deck mud over the mesh, spreading it out with a trowel. Create a gentle slope toward the drain for proper drainage in your shower. Check the slope with a level to ensure the shower floor slopes 1/4-inch for each foot of space between the shower drain and the wall.
- 5
  Pack the deck mud with a wooden float. Pound hard to get a firm, well-packed layer.
- 6
  Allow the deck mud bath to air-dry for 24 hours before installing your shower tile.

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