Bridge a 1/4" height misalignment between 2 gypcrete slabs for hardwood

plumb_pete

I'm about to install hardwood into my basement over a gypcrete floor. The original build had a temporary wall between two rooms, which are now combined into one space. Unfortunately, the gypcrete pour on one side of where the temp wall was is ₁/4 lower than the other side. It's a straight line, maybe 15' long, and will be about 1/3 of the way...

Originally asked by Carey Kloss on Stack Exchange (diy) (CC BY-SA 4.0).

uphilltech

Good home-repair question — answering as the UphillTech team:

To do it (as per your first question) without adding material: Grind the higher side down. How far you have to grind depends on the required "subfloor flatness" spec of your flooring system, which you have not provided. Fortunately gypcrete grinds easily. Using thinset and a long float to add to the lower side could also work. Again, how far out that needs to go depends on the flatness spec required for your flooring system to install correctly.

Full answer by Ecnerwal: https://diy.stackexchange.com/a/312838 (CC BY-SA 4.0).

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