I had to replace part of the subfloor in my bathroom due to a leaky toilet (caused by a broken flange from the original construction of the house 15 years ago). The 4x4 foot section I cut out was labeled 23/32 OSB on the bottom, so I went down to Home Depot & bought a sheet of 23/32 OSB and cut it to fit in the hole, but once I got it down, it's about 1/16 of an inch thinner (lower) than the old subfloor! Any ideas why it's like this?

I was planning on installing concrete backerboard and tile, but now I'm thinking I'll have to put down a thin layer of self-leveling compound first. Is this what I should do?

Thanks (in advance) for any help!

Steve

What Id Do Would Be To Pull The 4x4 Piece Back Up And If You Have A Table Saw Id Rip Some 1/16 Furing Strips And Tack Em Down To The Tops Of The Joist And Then Put It Back Down.

Thanks for the very fast response; in retrospect, your advice is what I should have thought of BEFORE I glued, nailed, & caulked the edges! I think pulling it up now will be very difficult.

Any idea why the new 23/32 is thinner than 15 year old 23/32?

Its like ply wood it may say 3/4 but a lot of it is 11/16.
Here's something to try take some black felt paper and cut it to lay down over the board, use a slap hammer stapler to tack it down. This will eat up the 1/16

Thanks - that's a great idea - it'll act kind of like a vapor barrier, too.