229AR Elastomeric

Karnak #229AR-Elastomeric is a single component, rubber reinforced asphalt which forms a highly elastomeric waterproof coating. The dried film cures to a tough flexible finish and will resist variations in temperature and weather. Karnak #229 AR-Elastomeric has excellent resistance to acids, alkalies and salts in the soil and will not deteriorate.


Karnak #229 AR-elastomeric is available in brush/spray and trowel grades. Karnak #229AR-Elastomeric is used as a waterproofing coating on primed exterior above or below grade surfaces such as masonry, metal, wood, stone, brick and concrete. Karnak #229 AR Elastomeric can also be used as a vapor barrier when applied to interior above grade surfaces.


  • Easy to apply.
  • Tough, flexible, elastic, rubber-like film.
  • Excellent adhesion to most surfaces including primed concrete, masonry, metal and sprayed urethane foam. Weathered asphalt may not need priming.
  • Excellent water and water vapor resistance.
  • Excellent weather resistance.
  • One year shelf life.
  • One component, needs no intermixing.
  • Good resistance to salts and alkalies.
  • Compatible with many highway and bridge specifications.


  • ASTM D-4586 Type I
  • ASTM D-4479 Type I


Surfaces must be clean, dry and free from oil, grease, release agents, laitance, dirt, dust and debris. All cracks and holes should be filled with Karnak #229AF AR-Elastomeric trowel grade prior to surface coating. If the surface is extremely porous and/or dirty, Karnak #108AF Asphalt Primer may be utilized to provide a firm film base prior to the waterproofing application.


Karnak #229 AR-Elastomeric should be mechanically mixed thoroughly, prior to application. Karnak #229 AR-Elastomeric, brush grade should not be applied to vertical surfaces.

BRUSH APPLICATION: Apply Karnak #229 AR-Elastomeric brush grade to horizontal surfaces using a wide, fibered roof brush at the rate of 2 to 4 gallons per 100 sq. ft..

TROWEL APPLICATION: Karnak #229 AR-Elastomeric trowel grade may be applied to either vertical or horizontal surfaces using a smooth edge trowel. Coverage amount will vary depending on desired thickness. To achieve a 1/16" thickness apply at the rate of 4 gallons per 100 sq. ft.; 1/8" apply at the rate of 8 gallons per 100 sq. ft.; 1/4" thickness apply at the rate of 15 gallons per 100 sq. ft.


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


  • Hardness, Shore A: 55 ASTM D-2240
  • Elongation - Brush: 700% ASTM D-412
  • Elongation - Trowel: 500% ASTM D-412
  • Tensile Strength, PSI: 400 ASTM D-412
  • Moisture Vapor: 0.03 ASTM D-1653
  • Water Vapor Permeance: 0.017 perm ASTM E-96
  • Transmission: ASTM D-6171
  • Water Absorption: 0.07
  • Weight per Gallon: 8.60 lbs.
  • Solids: Caulk 68%
  • Solids:Trowel 65%
  • Solids:Brush 60%
  • Solids:Spray 50%


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.

Translate Site

Kanopy Reflective Roof Maintenance Solutions
  • Reduce Energy Use
  • Lowers Peak Energy Use, reducing energy costs year-round
  • Helps the environment, reduces "Heat Island Effect"
  • Extend the life of the roof
  • Reduces waste. Helps avoid roof tear-off.
  • Economic compared to roof replacement
  • Eliminates interior building operation disruption