Fortifiber Aquabar B Barrier Paper Flooring Underlayment

Aquabar "B" is a semi-permeable moisture vapor retarder or cleavage membrane for use under tile and wood floor installations. Aquabar "B" is rated for "moderate" water-vapor resistance. Aquabar "B" is a 30/30/30 Grade B asphalt laminated duplex type craft paper. 1 roll - 36" wide by 167" lineal feet( 500 sq ft)