We installed BR 111 engineered flooring almost a year ago. Our subfloor was very uneven but we used some type of roofing material to level out most areas.

There was one really bad spot that we just could not get right (apparently). It is about a 3' x 4' section. When you walk on it, you can see the floor squish down and it is kind of bouncy. The area is very close to the stair molding/step down living room, so we could unscrew the stair molding and probably remove some baseboards to try and lift the floor a bit to fix the problem.

What would we use to fix this? I have read a lot of the other posts on fixing this type of problem but no real conclusive answers on products to try and use, etc.

Should we try sliding another piece of the roofing material in there?

Thanks

I forgot to say that we did the floating installation and the floor is a glue together type.

if its moving down then obviously there is a low spot if you can get to it without destroying everything around it then go for it.

thanks, but what do you suggest we fix it with?

If you can get the floor lifted enough to slide some shingles underneath, that would be a good thing to try. Just use common sense so you don't break the seams apart.