WaterBlock® NOF is constructed from heavy weight woven Polypropylene mat, laminated between two layers of UV resistant polypropylene, blended with specialty resins to create the STRONGEST, MOST DURABLE, INORGANIC, FUNGI RESISTANT, UV RESISTANT, LOW COST flexible nail on window and door flashing available. 

While most manufacturers only perform the minimum amount of ASTM tests required to meet the basic industry requirements, we wanted to be sure we not only surpassed the minimum requirements, but SET NEW STANDARDS with superior performance characteristics to provide you with the BEST LOW COST FLEXIBLE NAIL ON WINDOW AND DOOR FLASHING you can buy!