You say so your self in your foil faced polyisocyanurate example.
Does your floor need to be able to breathe.
Most folks who say walls need to breath mean moisture needs to be able to dissipate sufficiently to avoid mold and rotting issues in the wall cavity.
I just wanted to add one more vinyl floor variant that you should consider for a basement installation if you are already considering a click lock floor.
I highly recommend loose lay vinyl tile.
The other answers hit the nail on the head wood floors in basements or anywhere subject to moisture is generally a bad idea.
If the subfloor is new it may need longer especially.
Breathe easier about your flooring.
The need for materials that don t trap moisture is true for many houses.
When it comes to insulating homes sealing them and providing proper ventilation a number of myths and old wives tales persist.
2 walls have to breathe.
There are those who claim that houses need to allow in a certain amount of fresh air even with the windows closed in order to function properly.
Allow the subfloor to dry for at least 72 hours after you remove an old floor covering and before you bring the new flooring into the room.
Unless you re in a one way climate like minneapolis or miami putting plastic in your walls will trap moisture and grow things.
A flooring professional should be able to help do the research.
Choose products with little or no formaldehyde.
Nor will putting a rug over your floor.