[masraum]

Originally Posted by gregpark

Ahh, you're talking about your floors being out of level as oppose to not being flat. A floor can be re-leveled but usually involves replacement plus cutting and shimming joists using a laser. Can be pretty costly. Flat is doable, out of level is usually tolerated after the customer gets an estimate

I think to level our upstairs, you'd practically have to take the top of the house off, build a new second story floor, and then put the top back on. The floors are pretty flat except in some places towards the edge or in the corners.

While we're on the subject, if we're putting down 2 or 3 layers of water based satin poly, what would you recommend doing in between coats. I'm concerned that trying to do any screening or sanding could cut through previous coats and stain which would be a disaster.