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What is the proper way to level an existing 3/4″ x 6″ subfloor and new 23/32″ plywood subfloor. The existing has expanded slightly with age. 3/4″ oak hardwood will be installed over both types of subfloor. The difference is a maximum of 3/32″; however it is mostly less than a 1/16″. The transition from new to old occurs at doorways.
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The proper way would have been to get the new even with the old when it was put down. Now, you'll have to do what you're thinking. Float the oak floor over the difference with some shims and maybe adhesive and get it close. There isn't much to a 1/16th that should scare you too much. There's probably more than that in the crowns in the joists. Otherwise, put in a threshold at the doorways that makes the change look planned.Best of luck.
*I wouldnt fret over 1/16" or even an 1/8th if its being covered with 3/4" finish floor (linoleum would be a different story). However 3/16th and you may want to sand the higher floor with a floor sander at the transition or use a floor leveling compound... I usually try to make the decking level in tie in at doors, etc. by setting my joist height accordingly...You may want to try shims and glue....
*Cal's right, it should have been levelled first, but is there any reason why you can't sand a little heavier near where they join up to help even it out? I've done it this way with pretty good results, mostly with pine though.It isn't too much of a varience, 1/16-3/32" in any case. Is it an old house?
*I would mix up a batch of Fix-All and spread it out over 4-5 feet to slowly transition the elevation change.Alternatively, I would dam up the edges, and pour some self leveling compound down. The stuff is very thin, and will leak everywhere that is not damed, and will harden like a rock in minutes, so work fast. I don't know where you would stop the compound, and it is hard to transition. So my first choice would be FixAll.
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What is the proper way to level an existing 3/4" x 6" subfloor and new 23/32" plywood subfloor. The existing has expanded slightly with age. 3/4" oak hardwood will be installed over both types of subfloor. The difference is a maximum of 3/32"; however it is mostly less than a 1/16". The transition from new to old occurs at doorways.