What is the best way to insulate a floor of a home that is on piers?
I heard one sheet of aluminion foil is 1/10000 cm thick, so about 0,001 mm thick
seal all and every joint with glue or caulk, to stop air infiltrationthen insulate the cavity with the highest r-value insulation that you can useafter that use a plyboard and seal the edges after nailing it in placethan use house wrap, finally install what ever exterior type of material that you want, cedar, vinyl sidng, ect.
