I am installing laminate tongue-and-groove floating floors in my kitchen with the aid of my Grandfather. I was always under the impression that a floating floor was just that - not pinned down by glue, nails, etc. in order to let it expand with humidity (which I live in northwestern PA, so fairly humid in the summer). However, my Grandfather insists that it HAS to be nailed down. He has barely gone into any reason why. He was a carpenter his whole life though, so I decided to do more research, and found that mostly people do not nail them down, but there might be advantages to it.
Related questions like Should I install a floating floor or a staple down for engineered hardwood? are helpful, but there are also resources like USING THE POWERNAIL 2000 TO INSTALL A FLOATING HARDWOOD FLOOR say that there are advantages and you SHOULD do it (but they could also just be trying to sell me the nail gun).
Is my Grandfather correct and the floor should be nailed, or should I push back more?