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Unread 02-18-2019, 11:28 AM   #1
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Location: Houston, TX via son
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Self-leveling pour is not flat

I am redoing a powder room. It is only 24 sqft. The floor is not flat (maybe 1/4 in from highest to lowest spots) so I decided to use a leveling compound. I screwed plywood to the the subfloor, applied the primer, let it dry and then poured the self leveler. I used Mapei Self-Leveler Plus and used the high end for recommended amount of water. I poured out about 3/4 of a bucket and pushed it around until it looked even and then I went over it with a blade. When I was done it looked perfect, surface was very smooth. As soon as it was dry enough I put a level on it and the high spots were still high. I probably got rid of half of the variation but I am disappointed in my results. Any suggestions on what I might have done wrong?
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Unread 02-18-2019, 12:10 PM   #2
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You can use a rub stone to reduce the high spots. SLC isn’t designed to be a wear surface, so it’s softer than regular cement. For an area that size, it shouldn’t take too long.
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Unread 02-18-2019, 02:48 PM   #3
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Surface tension will tend to follow the variations in the floor unless it is deep enough. Many of them want at least 1/2" over the top of the highest point on a wooden subfloor. You can do it with less, but it takes more skill.

IMHO, they shouldn't call the stuff 'self-leveling'. Keep in mind, even water isn't exactly a flat surface as can be seen from a droplet on a freshly waxed car.
Jim DeBruycker
Not a pro, multiple Schluter Workshops (Schluterville and 2013 and 2014 at Schluter Headquarters), Mapei Training 2014, Laticrete Workshop 2014, Custom Building Products Workshop 2015, and Longtime Forum Participant.
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Unread 02-22-2019, 06:03 PM   #4
Join Date: Feb 2019
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Lol a rub stone. I bought a 7" grinder with diamond blade attachment and gave up. I poured SLC and had the same problem in a 25sf bathroom. Ended up breaking it all back out and leveling the joists with shims and plywood. Good luck.
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