Del-Val 205 Cap Mastic


Del-Val 205 Cap Mastic is manufactured by blending asphalts and mineral fillers and refined solvents. The fillers in this product strengthen the liquid asphalt to form a tough but elastic surface. Once cured, it will stay flexible and not crack in the cold and hot climates. This enables the product to set quickly with less slippage of field sheets. Del-Val 205 Cap Mastic is formulated to a heavy duty brush consistency providing a secure bed in which to lay sheet goods.


Del-Val 205 Cap Mastic is used in the application of 90 lb. roll roofing paper or SIS Felt as a cold process adhesive. It can also be used, with polyester mat as an inter-ply cold process adhesive in the creation of a BUR system. It can also be used over aged BUR roofs as a flood coat prior to the introduction of aggregate or other protective coating. 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 to a clean dry surface with a brush, roller or squeegee.


Apply at a rate of 2 to 3 gallons per 100 sq. ft.

Cleanup Del-Val 205 Cap Mastic

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

Code Approvals/Compliance

This product meets or exceeds the requirements of ASTM D-3019 Type III


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

Comments are closed.

  • Silicone Roof Patch Is Here!

    Adheres to Wet Surfaces with No Mixing Required!

    Learn More!

    Del-Val 241 2 Gallon Pails Three Pails for Web Spot

    Available Now in Black, White & Gray!

About Us

Ut non nulla mi, eget imperdiet sem. Nam lacus ligula, venenatis vel aliquet eu, venenatis congue magna. Sed rutrum faucibus semper.

  • Contact Us