So I want to install a new floating hardwood floor in the master bedroom of my condo.

I removed a layer of carpet and carpet underlayment to find some ancient linoluem glued to the subfloor. The condo was built in the late 70's.

I was just going to use some roofing tiles to even any dips in the subfloor, it crowns a bit in the middle).

BUT...there is one section of the plywood subfloor spanning about 10' x 1.5' across the width of the room (room is 17' by 10') that looks like it has heaved or expanded up and it creates a 1/4" abrupt drop to the next plywood section.

I was thinking about cutting out that section of the subfloor and replacing it, but I'm not sure if the flooring contains asbestos and if it does I have been told to just let it lie and build overtop.

So, if the flooring does contain asbestos, would the best alternative be to build a new subfloor overtop to match the level of the heaving subfloor? I am hesistant to do this, seems like a lot of work just to accomodate one section of damaged subfloor.

Any help is appreciated. Thanks!

-Shawn

I'd just float it out with roofing tiles and paper unless it is so out of spec that it will not help to float it out. Where I come from home owners can do anything they dang well please as far as asbestos. The lino and tiles are not that big a deall unless you pulverize and sand them. Wear a good mask. Oh, plus you can take a piece in and have ot tested at a local lab for a small fee.