19 Ultra Rubberized Wet/Dry Flashing Cement (Emergency Repair)

19 Ultra Rubberized Wet/Dry Flashing Cement (Emergency Repair)

Available in: 10.1 oz. caulking cartridges, 1 gallon cans, 3 gallon buckets & 5 gallon pails
KARNAK 19 Ultra Rubberized Flashing Cement Caulk is the next generation -free flashing cement. Scientifically compounded with a selection of rubber reinforced asphalt, mineral fibers, and refined solvents. KARNAK 19 Ultra Caulk is manufactured to a heavy pliable trowel graded consistency.
KARNAK 19 Ultra Caulk provides a durable elastomeric coating of greater strength, excellent adhesion and high resistance to water and weathering.


  • Rubberized – elastomeric
  • Wet or dry application
  • Improved low-temperature flexibility
  • Will not shrink or crack
  • Smooth, easy to apply rubber-like trowel consistency
  • Excellent adhesion
  • Excellent resistance to flow (sag) at high roof temperatures
  • Ready to apply – no mixing required
  • Greater strength
  • VOC: 306 g/L
  • ASTM compliant



KARNAK 19 Ultra Flashing Cement is a general purpose asbestos-free flashing cement for repairing leaks in shingles, concrete, metal or asphalt roofs, SBS and APP modified bitumen membranes flashings on walls, chimneys, flues, skylight flashings, downspouts and cornices.

KARNAK 19 Ultra is excellent for sealing cracks in concrete and brick, as a joint filler for precast roof slabs, for repair, patch and flashing detail on SBS and APP modified membranes, and for general purpose use in maintenance of exposed buildings and structures.

Physical Properties

1. Consistency: A smooth, heavy trowel consistency that will readily spread on and adhere to most all surfaces without sagging.
2. Character of Dried Film: Uniform, excellent adhesion to masonry, steel, slab insulation and 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 dry, clean and free from oil or grease, dust, dirt, loose paint or other foreign matter.

Spread KARNAK 19 Ultra 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, spread KARNAK 19 Ultra Flashing Cement over the damaged area then embed KARNAK Cotton, Fiberglass or Polyester membrane reinforcement and then apply another layer of 19 Ultra Flashing Cement over the entire patch.

Caution/Care of Tools

Combustible Mixture: 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 physical immediately. Keep out of reach of children. Keep container covered when not in use. Do not thin. Consult SDS for further safety precautions. Dispose of in an environmentally safe manner. Cover air intakes during application and while drying.

Tools and other equipment should be thoroughly cleaned with mineral spirits, taking necessary precautions when handling combustible materials. To clean hands use 709 Karna-Klean or a waterless hand cleaner.

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