How do you level a subfloor when you are going to nail 3/4 inch hardwood to it?

I have a circular depression in my subfloor about 4 feet in diameter. I painstakingly planed strips of wood ';stringers'; to bring the depression up to level, about every 16 inches inside the depression. Im going to fill the spaces between the planks with floor leveler, but the lumber liquidators brochure says not to use leveler..i assume because you can't nail into it.......what do you suggest?How do you level a subfloor when you are going to nail 3/4 inch hardwood to it?
In your instance, I would use the floor leveler regardless of what the brochure says. In fact, not all wood floors (and I'm not refering to laminates) are nailed down... some are actually glued down, others are glued and nailed for maximum installation, too.





I suggest that you utilize a wood flooring glue in that area where you have your problem... where the floor leveling will be used. Although troweling a wood flooring glue during your floors installation is much more extensive and requires a bit of elbow grease, consider doing this on the entirety of the floor.





These glues can be purchased at many retailers and shouldn't cost too much extra money; the expense is well worth the improved installation... and it resolves the issue you have where there was a leveler.





Good Luck!How do you level a subfloor when you are going to nail 3/4 inch hardwood to it?
Use a liquid floor leveler
Armstrong makes a floor leveler that is available a Home Depot or Lowes.