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Installing tongue and groove flooring, do you glue to the subfloor or use underlayment and add glue between it and the board?

The guy at the big box store told me to add adhesive to the underlayment foam padding. That seems ridiculous to me.

Is this accurate? I am replacing a damaged tongue and groove board. I won't be able to nail it down. I went looking for glue for the groove and tongue sections, but the big box store guy told to also add construction adhesive between the foam underlayment and the board.

Is this correct?

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    Big-box advice is ridiculous. The proper trade supply house managers have told me flat-out they shop the big box stores looking for employees who know anything, and hire them away. Now how do you plan to replace this floor in the future? – Harper May 25 '18 at 22:27
  • No, it's going to be permanent – Matt May 25 '18 at 22:28
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    Nothing is "permanent". For example, a water overflow or leak can can damage tongue in groove flooring. Many of these floors are floating if they are over concrete. If there is a wood sub-floor, the individual planks can be nailed to the subfloor. I have not heard of tongue in groove being glued to the subfloor. Some planks are glued to concrete. – Jim Stewart May 25 '18 at 22:43
  • This is for 3/4" thick T&G? Never, never apply foam. underlayment to nail down flooring. In certain circumstances there are reasons to glue a floor down even if it is nail down, for example, random width flooring, some of that can get as wide as 10-11". If it is 3/4" thick nail down surface nails and carpenters glue in strategic places do the job. – Jack May 26 '18 at 2:07

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