Roof-Master 220 All Weather Flashing Cement

Product Fast Facts
All Weather Formula
Stop Leaks in Wet or Dry Conditions
Crack Resistant Seal


Roof-Master 220 All Weather Flashing Cement is a unique high-quality flashing cement that has been manufactured using the highest quality chemical ingredients available. Its flexible, smooth, trowel consistency makes this product ideal for patching emergency holes and cracks in roofs. Roof-Master 220 All Weather Flashing Cement is ideal for sealing emergency leaks on both wet and dry roof surfaces and has excellent underwater adhesion.


Specially formulated for use in damp, wet roofing situations, Roof-Master 220 can be used as a heavy duty flashing cement for repairing flashings, asphalt shingles, built-up roofs, metal and masonry surfaces. Great for sealing leaks and openings at flashings (chimneys, vents, skylights, metal joints, gutters). DO NOT USE with EPDM, PVC, TPO or other single-ply membranes.


Surface must be clean and free of dirt, dust, oil or grease and be free of any other foreign matter that would interfere with good adhesion. In colder climates we recommend storing the product at room temperature for 24 hours prior to application.


Apply with a trowel or putty knife. Spread Roof-Master 220 All Weather Flashing Cement to approximately 1/8” thickness and work thoroughly into the problem area. Repairing cracks and blisters: if the area is 1/4” wide to 2” long apply United Asphalt Cotton or Fiberglass Fabric for reinforcement, then cover with additional cement.


Approximately 8 gallons per 100 sq. ft. (per coat)

Code Approvals/Compliance

This product meets or exceeds the requirements of ASTM 4586 Type I and ASTM D-3409

Cleanup Roof-Master 220 All Weather Flashing Cement

Clean tools with Del-Val Orange Cleaner & Degreaser or mineral spirits, taking necessary precautions when handling combustible liquids.


DO NOT THIN. DO NOT HEAT CONTAINER. DO NOT store in an area where temperatures exceed 120°F.

V.O.C. Less than 300 g/L

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