Sand off any paint or adhesive on the subfloor (if necessary). How pristine your subfloor needs to be depends on what kind of replacement flooring you're installing. If you plan to glue your new hardwood flooring down, sand away any paint or adhesive stuck to the subfloor with an electric sander. If you're installing nail-down, floating, or locking hardwood, you don't need to sand the subfloor.[5] Denver Hardwood Floor Install
Glue down engineered hardwood, alternatively. If you don't want to nail down the boards, you do have the option of using adhesive to put engineered hardwood in place. It's a good choice, but won't last as long or be as sturdy as nailed down hardwood. The procedure is very similar to the nail-down process. Follow the adhesive manufacturer's instructions for installation and drying times.[11] Hardwood Floor
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