The 10mm Sure Cavity rainscreen drainage plane from MTI maintains a space (a bit more than 3/8 inch) between veneer materials and the structural wall to drain incidental moisture and keep the building enclosure dry. Channels provide a gap for ventilation and enable moisture to travel down and out the bottom of the wall. According to the manufacturer, the rainscreen’s high-impact polystyrene ensures durability and prevents compression and waviness, and the adhered fabric blocks mortar or stucco from filling the drainage space. Sure Cavity is compatible with stucco, brick, stone, fiber cement, and cedar. We found a 25-foot-by-31 1/2‑inch roll online for about $125.

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