Superior Performance
Our Contractor CFlex-SB (solvent base) or CFlex-WB (water base) waterproofing membrane combines with Dow PERIMATE drainage/insulation board
to form our Contractor Deluxe System. We back this system with a 15 year warranty.

PERIMATE board can handle up to 363 gallons of water/hr/2' x 8' sheet, with a warranted long-term R-value.