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Old 12-04-2017, 09:51 AM   #1
DonS
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Assessing sub-mud

Jack hammered out the old 1/2" Franciscan clay tile leaving the mud it was floated in. The sub-mud (my term) only popped free of the slab in one area (see pic). I am thinking I should jack out the entire floor of this material, and level with Ardex. Some places it is less than 1/2" all the way up to an inch.
Any thoughts or recommendations here? This was laid almost 50 years ago and there is a bevel across the middle of the floor.

Does taking it all out and starting fresh make sense (besides the labor involved)? Putting in 12 x 24" porcelain.

Thank you.
Don
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Old 12-05-2017, 09:13 AM   #2
John Bridge
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Hi Don, Welcome aboard.

Is that concrete under the "sub-mud"?
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Old 12-07-2017, 09:15 AM   #3
DonS
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Hello John,
Yes it is. The kitchen is on slab that was purposely poured lower (according to blue prints) so the tile could be brought up to the level of the surrounding floors (teak parquet) that meet the kitchen floor on both ends of the space.

The mud looks irregular, and looks as though it was done in several pours, which makes me think a fresh Ardex leveling would be a better place to start, flatter surface for my new tile since they are 12 x 24". Just not absolutely sure if this is what to do.

Thank you.
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Old 12-07-2017, 10:28 AM   #4
John Bridge
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Don,

The easiest and least expensive way to get the floor back to the original level is to re-do what was done the first time. That is, remove all the old mud and tile, then re-float the floor with deck mud.

If you are planning to only fill the parts that have lifted up you could use deck mud or self-leveling cement. I'm not sure what you have in mind with the Ardex product.
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Old 12-08-2017, 09:49 AM   #5
DonS
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My thought was to level the floor with an SLC (I've only used Ardex leveler). Probably only an inch at the thickest. Would deck mud or SLC achieve the same result?

Thanks.
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Old 12-08-2017, 10:22 AM   #6
John Bridge
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Deck mud over concrete can be applied in any thickness right down to nearly nothing and as much as 3 inches or more. It's very cheap as compared to SLC, and in my opinion it's more exacting. I think it will take you longer than SLC.
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Old 12-09-2017, 01:00 PM   #7
DonS
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Smile

Thank you for your input John. Certainly what I needed to make some decisions.

Much appreciation!
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