If it is a straight tongue and groove (like almost all solid flooring is), you do NOT want to float that. The only flooring that should be floated is that which has a lock mechanism rather than a straight tongue and groove. Like the picture below.
Buy a lock together bamboo made for floating, and lay it over the vinyl with a layer of laminate underlayment in between. No other method will be recommended.
I agree you do not want to float a real hardwood, tongue/groove floor. It will seperate before you are even finished installing it.
Also I would not glue the boards to each other either. No matter what floor you get. Depending on the seasons the boards expand and contract which could cause problems and it will just break the bead of glue in there anyway.
A composite bamboo floating floor system would be your best bet. I would just lay over the vynil floor, make sure you are even whith any other type of floor you are laying over too. You are going to need the under layment that those floors require. A blue or white pad, sold in 100ft rolls near that flooring in stores.
Of course you could lay a wood sub floor, but I think laminate flooring is the most cost effective.
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The only flooring that should be floated is that which has a lock mechanism rather than a straight tongue and groove.
This must be a young installer.
Before locking mechanisms were used, you had tounge and grove that would be glued together and that will still work. Not as easy as a locking mechanism, but possible. The solid bamboo doesn't expand the same as solid wood flooring and so it will be ok, you must have a underlayment as was mentioned.
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