Instructions / Assembly

330 Central Ave. I Clark, NJ 07066 I 800.526.4236 I Fax [phone] | www.karnakcorp.com
Updated: 05.04.20
ROOFING
19 Flashing Cement
*Read Safety Data Sheet before using this product.*
DESCRIPTION: 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.
USES: 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.
SURFACE PREPARATIONS: All surfaces should be dry, clean and free from oil or grease, dust, dirt,
loose paint or other foreign matter. Recommended application temperature is 40°F to 120°F. If applying
at temperatures lower than 40°F, the substrate must be free of moisture and/or ice crystals.
APPLICATION: 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 19 Flashing Cement over the damaged area.
2. Embed 34 Asphalt Saturated Cotton Fabric, 31 Fiberglass Membrane or 5540 Resat-Mat
reinforcement.
3. Apply another coat of 19 Flashing Cement over the entire patch.
COVERAGE RATE: Apply each application at an average thickness of 1/8” (8 gallons per 100 sq. ft.)
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.
CAUTION: 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. Store in a heated room and 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.
Exterior use only.
PACKAGING: Available in 5-gallon pails, 3-gallon buckets and 1-gallon cans.
If further information is needed, contact KARNAK Technical services at 800-526-4236.
PHYSICAL PROPERTIES &
SPECIFICATIONS
Weight per Gallon: 8.93 lbs.
Solids by Weight: 77% Nominal
Solids by Volume: 70% Nominal
Color: Black
Application Temp.: 40°F to 120°F
Service Temp
(Cured Film): 15°F to 180°F
VOC Content: 250 g/L MAX
ASTM D4586 Type I Class I
SS-C-153 Type I