made in u.s.a perma base permabase® cement board exceptionally withstands prolonged exposure to moisture! use as an underlayment or backing surface for tub and shower surrounds floors and a variety of other interior and exterior applications! cement board chwt board perma base base the 10 cus interior do base permaa perman perma base perma base moisture > mold resistant edgetecno reinforced edge easy to cut interior exterior use cement board perma moisture mold fdoetech reinforced easy to cut interior exterior use perma base cerent board na" edge orios irma edgetech reinforced edge easy td cut interior exterior use moisture & mold resistant industry's lowest water-absorption rating board shop permabase® cement board