229AR Elastomeric (Waterproofing)

    229AR Elastomeric (Waterproofing)

    Available in: 1 gallon, 3 gallon, 5 gallon pails, 55 gallon drums, and 30 oz. caulking cartridges

    KARNAK 229AR-Elastomeric is a single component, rubber reinforced asphalt that forms a highly elastomeric waterproof coating as well as an air barrier.  The dried film cures to a tough 40-mil flexible finish and will resist variations in temperature and weather. When applied to interior above grade cavity wall  structures, the protective coating helps to control moisture and inhibit air leakage in buildings as specified in a number of building codes. KARNAK 229AR Elastomeric has excellent resistance to acids, alkalies and salts in the soil and will not deteriorate.



    Coverage Calculator

    • 4-4 Gallons per 100sf**


    This is intended as a general guideline only, coverage can vary based on many factors.


    KARNAK 229AR Elastomeric is available in brush and trowel grades. KARNAK 229AR-Elastomeric is used as a waterproof coating on exterior above or below grade surfaces such as masonry, spray polyurethane foam, wood, stone, brick and concrete. KARNAK 229AR Elastomeric can also be used as an air barrier/vapor barrier when applied in exterior/interior above grade assemblies.

    Physical Properties

    Weight Per Gallon: 8.6 lbs.
    Hardness, Shore A, ASTM D-2240: 55
    Elongation, ASTM D-412: 350%
    Tensile Strength, ASTM D-412: 400 psi
    Color: Black
    Water Vapor Permeance, ASTM E-96: 0.017 perm
    Air Permeability (Leakage): 0.000 L/(s·m2) @ pressure difference of 75pa
    Service Temp. Range: -40ºF to 160ºF
    Solids, ASTM D-2967: Trowel 70%, Brush 63%, Spray 60%
    VOC: 361 g/L
    Salt Fog Resistance 1/16 cured film: 500 hours – Excellent
    Abrasion Resistance: Excellent
    Resistance to acid: 60 days – Excellent
    10% HCL: Excellent
    10% H2SO4: Excellent
    10% – 85% Phosphoric: Good
    Nitric Acid: Not Recommended
    Resistance to Alkalies: 60 days – Excellent
    10% NA OH: Excellent
    Nitric Acid: Not Recommended
    Resistance to Alkalies: 60 days – Excellent
    10% NA OH: Excellent
    45% Ammonium Nitrate: Excellent
    10% Ammonium Sulfate: Excellent

    Preparation & Application

    KARNAK 229AR Elastomeric Brush Grade should be mechanically mixed thoroughly, prior to application. For vertical applications use only 229AR  Elastomeric Trowel Grade.

    A. Exterior Vertical Surfaces – Apply KARNAK 229AR Elastomeric, trowel grade in one coat. If applying two, allow the first coat to dry. Coating must be  continuous and free of pinholes or holidays. Cover all slots, joints and grooves and into all chases and corners. Apply at the rate of 4 to 5 gallons per 100 sq.  ft.

    B. Membrane Vertical Surfaces – Apply 1 coat of KARNAK 229AR Elastomeric Trowel grade at the rate of 2 to 3 gallons per 100 sq. ft. Place KARNAK 3036  Poly-Mat or KARNAK 31 Fiberglass Membrane vertically over surfaces of coating making sure all edges are overlapped at least 3 inches. Smooth membrane firmly into place and eliminate all wrinkles. Apply second coat at the rate of 2 to 3 gallons per 100 sq. ft. In areas where hydrostatic pressure is known to occur, 229AR Elastomeric should be installed in a membrane system to all exterior foundation walls.

    C. Horizontal Surface: KARNAK 229AR Elastomeric Brush grade can be used as a waterproofing layer between the surface course and base structural  concrete slab above and below grade. Apply at a rate of 4 to 5 gallons per 100 sq. ft.

    NOTE: For horizontal waterproofing and below grade waterproofing, a protection board is highly recommended to protect the film during backfilling or while pouring the concrete topping slab.

    Caution/Care of Tools

    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.

    Tools and other equipment should be thoroughly cleaned with mineral spirits or Karna-Klean, taking necessary precautions when handling combustible material.

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