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Old 05-27-2013, 07:43 PM   #1
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Replacing tiles over old thick mortar bed


Hi everyone,

My kitchen tile is installed over what looks like a ~1" thick mortar bed (it's pretty old). The original owners installed this floor after they installed the counters, and among other things tiled in the dishwasher. When we recently had to replace the dishwasher, the only way to get it out was to chisel out a row of tile and a decent part of the mortar bed. I have since removed all of the mortar in the area and installed new wire mesh over the floor, and would like to fill in with mortar and tile in some replacement porcelain tile.

My question is this. What is the best way and products to accomplish this? Originally I thought I would mix some dry mortar, build it up to about the right level, then let it cure. After that I would add tile with normal thin set. Is this the right thing to do? I'm concerned that it will be hard to maintain the proper level if I do it that way. Is there a product I can use to fill in the ~1" deep by 49"x17" hole directly, setting tile on it while still wet so I can be sure to get the level just right?

Sorry if this is a stupid question. I'm a complete rookie on tiling and don't really know anything about different types of mortars.

Thanks!
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Old 05-28-2013, 05:04 AM   #2
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Replacing tiles over old thick mortar bed


You have a thick Jersey Mud Set----

You have two choices---first---two layers of 1/2" durrock,set in a bed of thinset and nailed with roofing nails.

Second--mix a small batch of deck mud---pack that in until level--then set your tiles using a modified thinset.

Here is a link with deck mud---you can use masons mortar---How to build a shower - Building a shower pan with pre-sloped mortar bed, liner and curb.

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Old 05-28-2013, 06:37 PM   #3
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Replacing tiles over old thick mortar bed


You have the wire there already. Imo the deck mud mixed to a damp consistency and packed down tight. Let dry then tile section would be the way to go although I never heard of doubling 1/2" cement board with thinset sandwiches does sounds clever to skip all that.
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Old 05-29-2013, 06:00 PM   #4
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Replacing tiles over old thick mortar bed


Thanks oh'mike and JetSwet for your helpful replies. I think I will rebuild the Jersey Mud Set. Any hints on making sure the final tiles are level? I'm assuming I can just be really cautious in not building the Jersey Mud Set to high, let it cure, then use the height of the thinset adjust to get the tile height correct?

Thanks again.
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Old 05-29-2013, 06:46 PM   #5
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Replacing tiles over old thick mortar bed


You have it figured out---you can easily fill a low spot---it the mud bed is to high? Big pain.
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