Mapei 4 to 1 Mud Bed Mix Sand and Cement Mortar Mix, 55 Lbs Bag

4 to 1 is a preblended mixture of finely graded sand and Portland cement used for thick-bed mortar installations.  4 to 1  flattens and levels an existing substrate before the installation of tile and stone.

• Screed and level from 3/8" to 3" (10 mm to 7.5 cm)
• Ideal for floating shower bases
• Mix with water or Planicrete AC