Thanks for your reply! I frequently find the vapor tented with the cardboard or form wood left on piers. With the vapor tented the cellulose debris quickly takes on moisture and deteriorates. Often there is mold / mildew. I am convinced that the vapor should be installed flat up to the piers with good overlap at seams and it would be nice if it didn't get disturbed. I have only seen vapor taped in one or two crawlspaces in 8 years! Best, Bonne