DISSCO 550 is a semi-mastic, heavy fibered asphalt base coating designed for use as a reconditioner for the maintenance of worn asphalt roofs. DISSCO 550 may be applied to almost any serviceable asphalt built-up roof. DISSCO 550 Roof Coating is manufactured from high grade industrial type blown asphalt, petroleum mineral spirits, selected asbestos fibers and special additives which give it unique penetrating and weathering qualities. The softening and penetrating properties of DISSCO 550 helps revitalize old, weather-worn built-up roofs. The asbestos fibers add higher strength, weatherability and improve abrasion resistance. DISSCO 550 will adhere to almost any type surface such as concrete, masonry block, wood, steel, plastic, and many others.

DISSCO 550 can also be used as below-grade foundation dampproofing compound when a heavy fibered coating is required. DISSCO 550 will keep ground moisture from penetrating the foundation wall and help eliminate the damp feeling common to most basements. However, where a hydrostatic head or high water table is encountered the coating should be upgraded to a waterproofing compound such as the DISSCO 540 MASTIC.

Due to varying types of applications, the DISSCO 550 is available in three viscosities, and is available in bulk and in packaged sizes of 5-gallon pails and 55-gallon drums.


DISSCO 550 is ready to use directly from container, no thinning or heating required. It can be applied by brush or sprayed with adequate spray equipment. The surface to be coated must be clean and dry, free of any material which would prevent proper adhesion to the surface.



On slag or gravel roofs, all loose material and dirt must be removed before application. Built-up flashings, gravel stops and all projection flashings must be redone, as needed. Splits, brakes and weak spots must be repaired properly with DISSCO 560 Roofers Cement and fabric or felt. DISSCO 550 is then to be applied by brush or spray at a rate that will depend on the condition of the surface to be coated. Cover finished roof with new gravel or slag, or coat surface with a nonfibered aluminum paint.

One Coat Application

Application over a smooth built up asphalt roof surface should be approximately 2 to 4 gallons per 100 sq. ft. of area. Cure time is approximately 48 hours but may vary with the weather. On most surfaces, reasonably clear of gravel or with gravel imbedded in the roof surface, the application rate should be 4 to 6 gallons per 100 sq. ft. of area. Application rate may vary with the condition of the roof.

Cold Process Roof Maintenance System

Two Coat Application

The Cold Process Roof Maintenance System is designed to be a two coat application. The first coat is to be applied at a rate of 5 to 6 gallons per 100 sq. ft. of area. Then install into the first coat a layer of polyester fabric such as Du-Pont Remay or equal. Cut the fabric to fit around protrusions in the roof. Then apply a second coat at a rate of 5 to 6 gallons per 100 sq. ft. of area. The amount of material required to cover the surface may vary due to the condition of the roof. However, do not use less then 5 gallons per 100 square feet per coat. Cure time is approximately 72 to 120 hours or longer depending on weather conditions.


One Coat Application

For a one coat application, it is recommended that the DISSCO 550 be applied at a rate of 3 to 4 gallons of material per 100 sq. ft. of wall area, with a finished dry film thickness of approximately 25 mils. Cure times is approximately 18 to 24 hours.

Two Coat Application

For a two coat application, it is recommended that each coat be applied at a rate of 2.5 to 3 gallons of material per 100 sq. ft. of wall area, with a finished dry film thickness of approximately 45 mils. Allow the first coat to dry at least 4 hours before the second coat is applied. Cure time is approximately 18 to 24 hours.

For applications not listed, please call DISSCO for recommendations.

Color Black
Weight per gallon 7.6 - 7.8 lbs.
Vehicle solids 50 - 60 %
Volatile vehicle 40 - 50 %
Asbestos fiber 8 - 10 %
Flash point 105°F
Base asphalt meets specifications ASTM D-449 Type II
DISSCO 550 meets or exceed specifications ASTM D-2823 Type II
  Federal SpecificationSS-A-694

When temperature is below 60°F-store product indoors overnight prior to use.
WILL NOT FREEZE, may be stored outdoors.
Clean equipment with a good citrus based degreaser or with regular mineral spirits.


Contains mineral spirits. Do not use near fire or flame. Use with adequate ventilation. Vapor harmful. Avoid prolonged or repeated contact with skin or breathing of vapor. Close container tightly after each use. Harmful or fatal if swallowed. If swallowed, DO NOT INDUCE VOMITING. Call physician immediately. KEEP OUT OF REACH OF CHILDREN.


DISSCO warrants its products to be free of defects in materials, but makes no warranty as to appearance or color. Since methods of application and on site conditions are beyond our control and can affect performance, DISSCO makes no other warranty, expressed or implied, including warranties of MERCHANTABILITY and FITNESS FOR A PARTICULAR PURPOSE, with respect to DISSCO coatings. DISSCO's sole obligation shall be, at its option, to replace, or to refund the purchase price of, the quantity of DISSCO coating proved to be defective and DISSCO shall not be liable for any loss or damage, including incidental or consequential damages, arising from the use of DISSCO coatings.

In case of an EMERGENCY involving any DISSCO product please call:
Info-Trac @ 1-800-535-5053.


For further information, please contact:

Denver Industrial Sales & Service Company

850 South Lipan Street
Denver, CO 80223
Ph. (303) 935-2485 · Fax (303) 935-6787
Toll Free (877) 935-2485


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