WS Block Filler
A one-component, water-based block filler based on Silica Fortified Rubber™ chemistry. WS Block Filler is specifically designed for use with Finestone air/water-resistive barrier products.
WS Block Filler is designed to prepare rough, porous concrete / masonry substrates for subsequent application of Finestone fluid applied air/water-resistive barrier products.WS Block Filler is also designed to promote adhesion of WS Flash self-adhesive membrane to rough CMU surfaces. It can be used to create tight, seamless expansion joints and to facilitate adhesion of through wall flashing systems.