I'm installing 3/4" X 2 1/4" solid prefinished Red Oak flooring perpendicular to the joists. In checking my subfloor (3/4" t&g plywood) I found a dip that runs parallel to the joists and is between 1/8" and 3/16" at the lowest point. I have added additional screws and everything is solid (room is over unfinished basement and joists have cross bracing). The dip tapers down to the low spot over a 2 foot span and is 3 feet long (room is 12' X 12'). Other than this dip the subfloor is pretty flat. The subflooring has quite a few smaller pieces as opposed to all large sheets. What do you recommend I use to build up the dip?
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