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Lucas #774 Flashing Cement is a trowel-applied Flashing Cement used to install,
repair or rebuild roof flashings at parapet walls, gravel stops, stacks, vents, monitors and
similar applications. #774 may be used with fiberglass, polyester fabrics or roll roofing
for permanent repairs. If repairing modified bitumen please refer to our #776 Elite
Flashing Cement. For repairs to wet or underwater surfaces please refer to our #779 AllWeather Flashing Cement or to #776.
#774 Flashing Cement is manufactured from Type I Roofing Asphalt, petroleum
solvents and non-asbestos reinforcing fibers. It applies fast and smooth and breaks
cleanly off the trowel without stringing.
The surface to be repaired must be clean, dry and free of debris. Apply #774 Plastic
Roof Cement evenly with a pointed roofer's trowel or gloved hand. #774 should be
applied 1/8 to 1/4 of an inch thick and may be reinforced with glass membrane or
polyester fabric to strengthen the repair. When making a permanent repair to a blister,
open up the area and allow it to dry thoroughly. Clean up with mineral spirits and
waterless hand cleaner.
Combustible mixture, keep away from heat and open flames. Avoid prolonged contact
with skin or fumes. If irritation occurs seek medical attention. Do not use near heat or
open flame. If swallowed, do not induce vomiting. Keep out of reach of children. Read
MSDS prior to use.
Applicable Specification: ASTM D-4586
Recommended rate of application: 1/8 to 1/4 inch thick
% Asphalt: 60 min.
% Solids: 71 min.
% Non-volatile ASTM D-2823: 80 max.
% Mineral Filler Content: 14 min.
VOC: less than 300 g/l
Weight per gallon: 8.5 lbs.
Flash Point (TCC): +100F° (38.7° °C)
Container Sizes: 5 gallon
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