Moisture Block 361 Dampproofing

Moisture Block 361 Dampproofing

  • Moisture Block 361 Damp proofing
  • Spray on Damproofing

Water threatens more than a building’s foundation. The exterior faces of interior walls of above-grade exterior masonry cavity walls can accumulate dangerous amounts of moisture as can metal surfaces that have been set into the ground. Mar-flex Moisture Block 361 Dampproofing is an above-grade vapor retardant that protects vulnerable surfaces from the buildup and penetration of damaging water. The versatile dampproofing product can also be used as a vapor barrier on the exterior face of the interior wall of above-grade exterior cavity walls or as a utility coating on wooden posts, pilings and other metal surfaces set into the ground.

• Available in a water-based formula
• Compatible with Mar-flex drainage and insulation boards
• Complies with ASTM D 1227-95, Type 2, Class 1 and ASTM D 1187, Type 1

Moisture Block 361 is a patented coating designed to damp proof and protect concrete and concrete masonry surfaces. It is applied as a water-based asphalt emulsion. Moisture Block 361 is highly weather resistant, flexible in the cold and resists changing temperatures. Most importantly, the membrane helps prevent water penetration. The durable film of Moisture Block 361 bonds to most surfaces. To ensure proper application, all surfaces must be clean, dry, sound; free from oil, grease, rust, scale, loose paint, and dirt.

While Mar-flex recommends buildings be protected by the added security of a waterproof membrane, Moisture Block 361 dampproofing can be used in below-grade damp proofing of precast concrete, poured concrete and concrete masonry surfaces. Moisture Block 361 Dampproofing technology is compatible with Mar-flex drainage and insulation boards.

  • Product Details

    Product Details

    Product Information

    MoistureBlock 361 Available In

    • CMB-36120 | 5 Gallon Bucket | Each or 42/Pallet
    • CMB-36125 | 55 Gallon Drum | Each or 4/Pallet
    • CMB-36123 | 330 Gallon Tote
    • CMB-36129 | 6,000 Gallon Bulk


    Total Solids – 55-60%
    Application Method – Spray, brush or roller
    Elongation at 70 degrees F – 180% min
    Application Range – 20-130 degrees F
    Weight/Gallon – 7.6 lbs.
    Total Cure Time – 24 hrs.
    Tensile Strength – 32 psi min
    Coverage Rate – 2 gal/100 ft
    Spray and Board – 20 mil dry thickness
    Spray Only App. – 20 mil dry thickness

  • Compliance

    Code Compliance


    Moisture Block 361 complies with ASTM D 1227-95, Type 2, Class 1 and ASTM D 1187, Type 1.

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