Available in 10.1 oz. caulking cartridges.

    KARNAK 229AR-Elastocaulk is a single component, rubber reinforced asphalt that forms a highly elastomeric waterproof caulk. The dried film cures to a tough, flexible finish and will resist variations in temperature and weather. KARNAK 229AR Elastocaulk has excellent elongation properties, good cold  weather pliability and excellent water and weather resistance.




    •Easy to apply.
    •Tough, flexible, elastic, rubber-like film.
    •Excellent adhesion to many surfaces including concrete, masonry, metal,
    BUR asphalt roofs, APP and SBS modified bitumen membrane and spray
    polyurethane foam.
    •Excellent weather resistance.
    •Excellent water and water vapor resistance.
    •VOC: 361 g/L



    KARNAK 229AR Elastocaulk is ideal for sealing leaks in and around asphalt builtup roofs, metal drip edge, metal trim, fasteners and screws, chimney cracks, concrete and masonry cracks, skylights, vents, down-spouts, gutters, expansion joints and other areas where nominal or slight movement is anticipated.

    Physical Properties

    Weight Per Gallon: 8.6 lbs.
    Hardness, Shore A: 55 ASTM D-2240
    Elongation: 350% ASTM D-412
    Tensile Strength, PSI: 400 ASTM D-412
    Color: Black
    Water Vapor Permeance: 0.017 perm ASTM E-96
    Air Permeability (Leakage): 0.000 L/(s·m2) @
    pressure difference of 75 Pa
    Service Temp. Range: -40ºF to 160ºF
    Solids: 70% ASTM D-2697
    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
    45% Ammonium Nitrate: Excellent
    10% Ammonium Sulfate: Excellent

    Preparation & Application

    Surfaces must be clean, dry and free from oil, grease, release agents, laitance, dirt, dust and debris. Metal should be wiped clean to remove oily residues. Dusty and/or porous surfaces may need to be primed prior to application with 108 Asphalt Primer.

    KARNAK 229AR Elastocaulk should be applied directly in an over cracks using an appropriate caulking gun.

    Application rate of a ¼” x ¼” bead of caulk will yield approximately 75 lineal feet per 30 oz. caulking cartridge. Coverage rate may vary depending on desired
    thickness and surface being caulked.

    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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    Recognized by professional roofing contractors as the best quality product in the market.