W.R. Grace Bituthene System 4000 200 sq. ft. Waterproof Membrane and ConditionerBituthene 4000 Waterproofing Membrane is a 1.5 mm (1/16 in.) flexible, pre-formed membrane which combines a high performance, cross laminated, HDPE carrier film with a unique, super tacky, self-adhesive rubberized asphalt compound. Bituthene 4000 Surface Conditioner is ..