88R Rubberized Waterproofing

Karnak #88R Rubberized Waterproofing is a solvent based asphalt compound, spray grade, manufactured with selected asphalts, stabilizers, polymer modifiers and mineral spirits. Karnak #88R Rubberized Waterproofing is a multi-purpose, cold applied protective waterproofing tht dries to a tough, durable and flexible coating that gives excellent performance over a wide range of temperature and weather conditions. Karnak #88R exhibits excellent resistance to acids and alkalis in soil and in the environment.


Karnak #88R Rubberized Waterproofing is designed to waterproof masonry and concrete exterior below grade surfaces and interior surfaces above grade. Karnak #88R also functions as a vapor barrier and air barrier. This product is suitable as a general protective coating for wood, steel and for all backup materials for masonry such as stone, brick and concrete. This protective coating also helps to control moisture and inhibit air leakage in buildings as specified in a number of building codes.


  • ASTM D-4479 Type I
  • SS-A-649D (Except AF)
  • Complies with Ch. 13 MA Energy Code


Surfaces should be clean and free of oil, grease, release agents, dirt, and laitance. All cracks and imperfections should be repaired and filled with Karnak #229AR-Elastomeric Trowel Grade and #31 Fiberglass Membrane or appropriate material prior to applying the #88R Rubberized Waterproofing. If the surface is extremely porous or dirty, it is recommended that Karnak #108 Asphalt Primer be utilized to provide a firm film base prior to coating with the #88R.


Apply by spraying with standard heavy-duty airless spray equipment at the rate of 4 gallons per 100 sq.ft. Karnak #88R may also be applied by masonry brush following the same coverage rate of 4 gallons per 100 sq.ft.


Karnak #88R is easily applied with a standard heavy-duty airless spray pump with heavy-duty guns and nozzles. Equipment manufacturers should be consulted for more complete information. Spray tip should be approximately 0.035 to 0.041 mm.


Allow film to cure for at least 24 to 48 hours prior to backfilling. Care should be taken during backfilling not to puncture or damage the coating. A protection board is highly recommended to protect the film prior to backfilling. Contact Karnak Corporation for alternate product suggestions.


  • Weight per Gallon : 7.8 lbs./gal.
  • Solids by Weight +/- 2% : 57.3%
  • Solids by Volume +/- 2% : 51.3%
  • Color: Black
  • Water Vapor Permeance: 0.0157 perms
    (less than 1.0 ng/Pa.s.m2 ASTM E-96)
  • Air Permeability (Leakage): 0.001L/(s.m2)
    @ pressure difference of 75 Pa ASTM E-283
  • Elongation: 550-600% ASTM D-412
  • Tensile Strength: 150 PSI ASTM D-412
  • Cure Time:24 to 48 hours @ 77ºF and 50% RH
  • Application: Spray or Brush
  • Coverage: 4 gallons per 100 sq.ft.
  • Solids:Brush 60%
  • Service Temp (Cured Film) : -40ºF to 160ºF


Do not use near open flame. Avoid breathing solvent fumes and prolonged contact with skin. Do not take internally. If swallowed, do not induce vomiting. Call a physician immediately. Keep out of reach of children. Keep container covered when not in use. Do not thin. Dispose of in an environmentally safe manner.


Available in 5 gallon pails and 55 gallon drums.


Tools and other equipment should be cleaned with mineral spirits, taking necessary precautions when handling combustible materials.

If further information is required, please contact Karnak’s Technical Service Department at 800-526-4236.

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