19 Flashing Cement

    KARNAK 19 Flashing Cement is a scientifically compounded composition of selected asphalts, mineral fibers, and refined solvents that are manufactured to a heavy consistency for application by trowel to provide a durable, elastic coating of excellent adhesion and high resistance to water and weathering. This product dries to a tough, flexible, waterproof and corrosion proof coating which gives excellent performance over wide ranges of temperature and weather conditions. KARNAK 19 Flashing Cement is available in 3 consistencies: Summer, Semi and Winter.

    Available in 5 gallon pails, 3 gallon buckets and 1 gallon cans.


    Federal Specification SS-C-153 Type I
    ASTM D-4586 Type I Class I


    KARNAK 19 Flashing Cement is a general purpose cement for repairing leaks in shingles, concrete, metal or asphalt roofs, flashings on walls, chimneys, flues, downspouts and cornices. It is excellent for sealing cracks in concrete and brick, as a joint filler for precast roof slabs and for general purpose use in maintenance of exposed buildings and structures.

    Available in 5 gallon pails, 3 gallon buckets and 1 gallon cans.

    Physical Properties

    1. Consistency: A smooth, heavy trowel consistency which will readily spread on and adhere to vertical and horizontal surfaces without sagging.
    2. Character of Dried Film: Uniform, excellent adhesion to masonry, steel, cured concrete, shingles, asphalt roofing and a variety of other surfaces.
    3. The dried film retains its flexibility and ductility so that the coating will resist extreme variations in temperature and weather.
    4. Has excellent resistance to flow at high temperatures when used on a vertical surface.

    Preparation & Application

    All surfaces should be clean, dry and free from oil or grease, dust, dirt, loose paint
    or other foreign matter.

    Spread KARNAK 19 Flashing Cement to an average thickness of 1/8” (approximately 8 gallons per square) and press tightly into joints, seams or cracks.  To repair large cracks, breaks and blisters:
    1. Spread KARNAK 19 Flashing Cement over the damaged area.
    2. Embed KARNAK Cotton, Fiberglass or Poly-Mat Membrane reinforcement.
    3. Apply another coat of KARNAK 19 Flashing Cement over the entire patch.

    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. Cover air
    intakes during application and while drying.CARE OF TOOLS:
    Tools and other equipment should be thoroughly cleaned with mineral spirits, taking
    necessary precautions when handling combustible materials

    Related Products

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