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Discuss Has all my Laitance been removed?? in the Tiling Advice | Tile Forum area at TilersForums. USA and UK Tiling Forum

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Ajax123

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If you are not sure sand it again? It's you that needs to be comfortable that its properly prepped. I can say there is some small, patches of what looks like flaky laitance there but whether its enough to cause you an issue I dont know from photos.
 

Ajax123

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Also have you moisture tested
 
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If you are not sure sand it again? It's you that needs to be comfortable that its properly prepped. I can say there is some small, patches of what looks like flaky laitance there but whether its enough to cause you an issue I dont know from photos.
Are those small patches of laitance the lighter shades of the floor?
 

Ajax123

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The only test I've done is laying a dpm on the floor with planks of wood on either side to weigh it down and checked if theres any condensation underneath 24 hrs later
Then you need a proper test. Are you DIY tile or getting a contractor in
 

Ajax123

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then the contractor should be able to verify moisture and should not start til its right.
 

Ajax123

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How do I go about getting it properly tested?
I have a humidity reader which measured relative humidity at 30% when I had the ufh on. Does that say anything?
yes it does... without wishing to be in any way harsh - it tells me that you don't know what you are looking at. to be dry the screed needs to be below 0.5% moisture or 75% RH. when it was made in the factory it had perhaps 13% moisture so your 30% is clearly wrong.
 
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yes it does... without wishing to be in any way harsh - it tells me that you don't know what you are looking at. to be dry the screed needs to be below 0.5% moisture or 75% RH. when it was made in the factory it had perhaps 13% moisture so your 30% is clearly wrong.
The 30% was the RH in the room once the ufh was running and when ufh was turned off the RH crept upto 60% and has been consistent at that figure. When using anhyfix https://www.tilersforums.com/forums/tile-adhesive/ isnt the figure 85% RH? I maybe wrong.
 
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Update...had someone come out to sand down the floor again. He used a diamond disc sander. I've hoovered all the muck but I'm still getting patches that are stuck to the floor (definitely not loose) of what I think is laitance on the floor?? Is there enough on there to fail the floor? Or am I overthinking?

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Ajax123

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If they’re not loose they’re fine
 

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