Control Cavity

Control Cavity™

Basement Drainage Mat

CC 4800, CC 4810

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Control Cavity
  • Control Cavity
  • Control Cavity
  • Control Cavity
  • Control Cavity

Control Cavity Highlights

Control Cavity™ works in a furred-out below-grade masonry wall system, maintaining a separation between the interior surface of a below-grade masonry wall and the moisture sensitive materials of the interior finished wall.  It creates a drainage system that allows moisture to travel down and out of the wall into a drainage field/drain tile system.



  • It restricts temperature and moisture transfer
  • Rigid and durable; will not compress behind interior finished wall
  • It cannot be installed upside down or backwards
  • An integral part of MTI’s below-grade system that ensures dry, healthy below-grade living spaces
  • 100% pre-consumer recycled content

Control Cavity Installation

  • Install with channel pattern running up and down vertically and fabric to interior
  • Overlap all edges and ends a minimum of 1”
  • Overlap horizontal edges shingle fashion to outside concrete, masonry substrate – upper sheet laps behind (back-laps) lower sheet
  • Cover entire wall surface, top to bottom, in this fashion
  • Mechanically fasten with concrete nails or power fastener; fastening pattern 2’ on center

Special Instructions

  • Note 1:  Masonry Technology Inc. recommends that all sump baskets, drain tile, and drain field systems be vented. If sump baskets, drain tile, and drain field systems are not vented, MTI recommends that top edge of Floor Edging™ be caulked or sealed off with appropriate material. 
  • Note 2:  Control Cavity™ shall not be used as a finished wall surface. Control Cavity™ should be covered with appropriate furring, insulation and finished interior wall materials.
  • Note 3:  When an in-floor heating system is installed, a vented interior drain field and drain system must be installed to release under slab pressure.
  • Caution:  COMBUSTIBLE: Protect from open flame and/or other items producing high heat. Use MTI materials in strict conformance with local building codes and regulations. Consult with local code or building official prior to installation. It is the buyer’s responsibility to ensure that MTI materials are used in strict conformance with local building codes and regulations. 

Control Cavity Ordering/Shipping

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

Control Cavity Specifications 

The 0.024" (0.6 mm) thick by 31.5 (1219 mm) wide high-impact polystyrene sheets formed with corrugations, with channels running vertically when installed on a wall.

Product Number CC 4800 CC 4810
Roll Length (feet) 50 25
Roll Width (inches) 31.5 31.5
Square Feet per Roll 132 66
Rolls per Pallet 32 32
Square Feet per Pallet 4224 2112
Pallet Size 48" x 48" x 68" 48" x 48" x 68"