Gravity Cavity™

Gravity Cavity^TM rainscreen drainage plane (drainage mat) is the economy alternative to our Sure Cavity^TM drainage plane (drainage mat) product.  It works because it maintains a separation between the materials used for the veneer and the structural back-up wall to drain incidental moisture and dry out the building enclosure.  Gravity Cavity drains and dries better than mesh-based drainage matrix products because its 1/8” deep channels enable moisture that enters the building envelope to travel quickly straight down and out the bottom of the wall, and it won’t compress behind siding.

Features & Benefits

• True channels conduct moisture to the bottom of walls faster than other rainscreen drainage mat products
• High impact polystyrene ensures durability and prevents compression, waviness, and nail drive-through experienced with fiber-based mesh products
• Saves installation time (half the time of furring strips and backer board)
• 96% pre-consumer recycled content
• The adhered fabric blocks mortar or stucco from filling the drainage channels and acts as a bug screen at the bottom

Protection from Incidental Moisture behind

• Stucco
• Thin Stone & Thin Brick
• Fiber Cement & Cedar Siding
• Brick
• Natural Stone

• Roll out Gravity Cavity™ rainscreen drainage plane/drainage mat over the WRB on the backup wall with spunbond fabric facing the weather. Back wrap 4’’ fabric on bottom course to act as bug screen.
• Temporarily attach Gravity Cavity rainscreen drainage plane/drainage mat with hammer stapler on wood backup walls or dabs of adhesive on masonry. 
• Roll out second and succeeding courses of Gravity Cavity™.  Overlap only the fabric.  Plastic butts directly to top of course beneath it.
• Install veneer – attachment of veneer material will sandwich the Gravity Cavity™ drainage mat permanently in place in thin veneer applications. 

Contact MTI at 1-800-879-3348 for specific cost to your destination.

Gravity Cavity Specifications

GC1816 and GC1832 are 0.024"(0.6mm) thick, high impact polystyrene sheets. They are formed with corrugations and a spunbond polypropylene fabric on one side with a 4" (102mm) skirt on one edge.