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Floor Prep

 
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Old 02-04-2019, 08:32 PM   #1
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Floor Prep


I have a new one to me. Remodeling a bath. Existing floors are Saltillo Terra cotta type tiles over 1-1/2" thick gypcrete with pex radiant tubing. They installed them over some kind of "paper" that was glued to the gypcrete. Is this an older crack isolation product? Good news is that the tiles demo easily.

I need to bring the elevation of the gypcrete under the tiles up after demo because the new porcelain is 7/16" vs the almost 1" that the old tiles are. My plan before demo was SLC after demo and then tile. As we demoed I found that they ran wide bottom plates as a screed for the gypcrete. I am now concerned with movement between the gypcrete and the wide plates. Now I am thinking of Ditra XL to help make up the elevation and give me crack isolation. What say you...right direction? Should I lightly grind the gypcrete to get rid of any glue residue left on the gypcrete?
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Old 02-04-2019, 08:45 PM   #2
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Re: Floor Prep


Sounds good to me. Last gypcrete I tiled over I primed with diluted redgard. Not sure what's considered best practice now. Grinding lightly with a cup wheel doesn't seem like a bad idea.

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Old 02-04-2019, 09:06 PM   #3
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Re: Floor Prep


Check with Schluter, I believe you can now use Kerdi board on floors. 3/8 would work well in this case, save a lot of mortar.

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Old 02-04-2019, 09:14 PM   #4
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Re: Floor Prep


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Check with Schluter, I believe you can now use Kerdi board on floors. 3/8 would work well in this case, save a lot of mortar.

Tom
Wouldn't the foam act as a thermal break and not let the floor feel as warm?
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Old 02-04-2019, 09:17 PM   #5
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Re: Floor Prep


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Wouldn't the foam act as a thermal break and not let the floor feel as warm?
Dumb ass me---I missed that part---sorry.

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Old 02-04-2019, 09:20 PM   #6
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Re: Floor Prep


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Dumb ass me---I missed that part---sorry.



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So maybe a bit of slc and then the XL would do the trick...
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Old 02-04-2019, 09:26 PM   #7
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Re: Floor Prep


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So maybe a bit of slc and then the XL would do the trick...
Yes, that would be the best approach.

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Old 02-04-2019, 11:04 PM   #8
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Re: Floor Prep


XL will also act as somewhat of a thermal break. Worth asking the client if they ever had a need for more heat.
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Old 02-05-2019, 02:07 AM   #9
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Re: Floor Prep


You will have to seal the gypcrete first it won’t play nice with Portland based products.
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Old 02-08-2019, 05:37 PM   #10
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Re: Floor Prep


We primed the subfloor according to manufacturer's requirements and poured the SLC in the areas needing brought up today. It went well. 14 50lb. bags for this lift. We will put another 1/4" over everything next week.

Also have all the GoBoard done in the shower and that gypcrete primed for starting the floor Monday.

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