[rnln]

Alright, after a bunch of questions and searches, I think I got a list to keep in mind.

- Solid wood: can not be installed directly into concrete because concrete has moisture.
- Engineer wood: can be glued directly onto concrete if moisture is low. If moisture is high, don't glue.
- Solid wood and engineer wood need a subfloor between concrete and the wood flooring. Best to do is glueing/nailing ply wood to floor, then nail the wood flooring on the ply wood. This is costly.
- Laminate can be float on concrete floor. Lay a thin foam layer between concrete and the laminate wood and you are ok. Why Laminate can stand moisture? Because it is floating?
- Bamboo, better than wood. No further information yet.

question: since laminate is 100% safe on concrete (with moisture) because it's is floating. Is clicking/floating engineer wood 100% safe with only a thin foam layer just like installing laminate?