CavClear® ... Not Just at the Bottom: You may be surprised to learn that CavClear® is NOT a mortar dropping collection device. CavClear® products are a completely different approach to moisture management and airspace maintenance in your masonry designs. CavClear® products are NOT installed just at the flashing levels; they are specified and installed throughout the full-height of the masonry. CavClear® products are the only complete, patented solution to protect weeps AND prevent mortar bridges.