Creating a Mortar Bed for a Shower Installation using Sakrete Sand Mix


So you’ve finally decided that you need a second shower in the house. Good idea. You’ve scoped out of the spot, taken all of your measurements and rounded up all of the supplies. If you’re reasonably handy and have access to the internet you should be able to figure this out.

Since the purpose of this blog is talk about the mortar bed, we will not be addressing or advising on any of the other concerns such as plumbing, walls, shower doors and a host of other things.

How To Make A Shower Pan

Before building the mortar base insure that the substrate that the mortar bed will be placed over is structurally sound and has the ability to support the weight of the mortar bed and the remainder of the project. Like with any job getting the base correct is essential. In this case you need a good solid mortar bed to support everything. Sakrete Sand Mix is a prepackaged cement mix ideally suited to this application. Don’t be fooled by the words “sand mix”. This product is actually a high strength mortar made with sand and portland cement which I will henceforth refer to as “mortar”. As a side note, Sakrete Sand Mix can be used in many other projects like a bedding mix for brick and flagstone walkways or a topping mix for rejuvenating old concrete surfaces.

There are two ways to install a shower. One is by using a preformed shower pan. Unless your significant other is dead set on having tile, this is the easier way to go. However if there is no talking him or her out of tile, then by all means you can lay the tile on the mortar bed. Either way you still need the Sakrete Sand Mix.

Since water tends to run downhill you will need to make sure that the tile drain is at the lowest point. Typically the drain is dead in the center but you can put it anyway as long as it’s in the lowest spot. The important thing is to begin placing your mortar at the drain and work your out and up. Typically ¼” per foot is the amount of slope required to get the water to cooperate.

The overall thickness of the mortar depends on a variety of factors. If you are using a preformed shower pan, the manufacturer of the pan should provide instructions as to how thick the mortar bed needs to be. If you are installing tile, the mortar bed should be 2-3 inches thick on the outer edge and slightly less at the drain.

When mixing the mortar use only enough water to obtain a “dry pack” consistency. A good way to tell if you have the right “dry pack” consistency is to make a ball with the mixed mortar similar to a snowball. You need just enough water so this ball holds its form without breaking, if so you’ve added the correct amount of water. By the way please wear gloves when messing with mortar. Some folks have more sensitive skin than others but overexposure can cause burns and irritation.

Once the mortar has reached the “dry pack” consistency place the mortar in position and using either a wooden float or a stout rubber trowel shove the mortar into place. Unlike concrete this type of mortar isn’t troweled with the intention of putting a nice smooth finish on the surface. The intent is simply to push hard on the trowel until all of the mortar is tightly in place and relatively smooth. Once the mortar is in place allow it set overnight. Once the mortar is set you can continue the process of placing either the shower pan or tile.

(Note for tiling: Tiling should begin within approximately 16 hours of the mortar bed installation. After 24 hours, the mortar bed enters a green state and should not have tile adhered to it for 28 days.)


  • Lee-Technical Service

    John Perkins, it depends on what the substrate is made of. We recommend that you follow TCNA mud bed installation guidelines that pertain to your substrate and conditions.
  • John Perkins

    What's the minimum thickness required at the drain point
  • Lee-Technical Service

    Jes, no you do not add thinset below the bed for adhesion. The bed will be a free float. We do not have a coverage chart for the Sand Mix when using it for a mud bed. You will be mixing to a dry pack consistency, so you will be using very little water. I would just buy more than I need and return the unopened bags. Better to have and not need it than need it and not have it. No, you will not need to add the Redguard for better tile adhesion. The thinset should have no trouble sticking the Sand mix.
  • jes

    Getting ready to form a 4 x 6.5 shower base over a shower liner. Plan on 2" at edges and I 1/4 at drain. Recommendations were to place thin set between liner and Sakrete Sand Bedding Mix for better bond. Also plan on using RedGard Waterproofing on all taped edges before placing tile. Having trouble finding overage for Sakrete SBM; can you help? How many sacks for dry mix as described above? Also, after curing Sakrete SBM would you recommend a coat of RedGard or just thin set and tile?
  • Lee-Technical Service

    Hugh L, Unfortunately we do not have a product that will taper from 1.5" down to a featheredge. We do have a product called Top N Bond that can be placed from 1/2" do to a featheredge. You can apply this material in multiple layers, giving an hour between each layer. All of the layers would have to be down in the same day for them to cure together. This is a polymer modified product so do not use a bonding agent with this material.
  • Hugh L

    I am needing to create slope on an exterior rough concrete surface patio I need a height of 1.5 inches, sloping down to 0 across an 11' distance. I would like to then lay a 1" bed of sand on top of the new surface for a clay paver installation. I wondered if such a mortar base would be a stable exterior surface (in a freezing environment) without having a bonded product as an overlay on top? Could you advise which product? Thank you!
  • Lee-Technical Service

    Leon, at this point in time we do not know what may or may not happen. You would need to consult the thinset manufacturer for their recommendations.
  • Leon

    So I didn't tile in the 16-24 hour window, I put down 9x12 porcelain tile over my sakrete sand and mud floor 48 hours after. What is going to happen or what may happen?
  • Lee-Technical Service

    new to this, you will have to contact Noble for that information since it is there product being placed over curing cement.
  • Lee-Technical Service

    first time user, you would need to contact the thinset manufacturer to find out whether or not their product can be used over Redguard. I do not understand the second part of your question. Using the thinset under the Sand Mix?
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