Ok so getting ready to put down "luxury vinyl planks" using the glue down method ontop of the subfloor throughout the upstairs. For some reason in the kitchen they used about a 1/4" thicker subfloor so going into the kitchen there is a 1/4" raise and again coming out to the hallway there is a 1/4" drop back down to the hallway. I would like to avoid using a reducer if possible, is there a product I can use to build a small "ramp" and sand it down to transition the two areas? or would this not be a good idea? any other ideas would be great - short of adding more subfloor everywhere else! thanks in advance

I'm buying a co-op which has old (1950s) parquet over concrete, most likely glued. It's on the 10th floor, so there are no moisture issues. I'd like to install a new hardwood floor over the parquet. I know it can be done because an acquaintance, who has a unit in the same development, had it done about 10 years ago and it still looks good. He said the installers nailed the hardwood to the parquet, with a layer of paper in between. I don't know the thickness of the parquet but I assume it's not more than 1/2". What sort of nails would be appropriate for this application? Aren't flooring nails typically too long for this? Any other considerations? Thanks, Steve