MortarFlash 40-Mil Rubberized Asphalt is a prefabricated self-adhering sheet-type waterproofing membrane composed of a high-tensile polyester film that is coated with a layer of specially formulated rubberized asphalt adhesive. MortarFlash adheres aggressively to most clean, dry substrates including metal, wood vinyl and masonry.

  • Easy-to-remove release sheet protects the adhesive until installation
  • Self seals around fasteners and punctures
  • Primer is recommended along with the use of a termination bar and a bead of sealant under the leading edge of the flashing
  • 3” side laps and 6” end laps recommended
  • Apply uniform pressure with hand roller over entire surface
  • When the use of prefabricated accessories is not feasible, MortarFlash™ Non-Asphaltic can be used to create inside and outside corners.


  • Do not install over solvent based sealants unless fully cured.
  • Do not install over PVC and silicone roofing materials
  • Do not install over flexible vinyl gaskets

Available Flashing Components

Recommended for use with MortarFlash Rubberized Asphalt

Termination Bars

  • PVC – 1/8” thick, UV stabilized
  • Stainless steel – 16 gauge Type 304
  • Stainless steel w/ lip – 16 gauge Type 304

Drip Edge

  • Stainless steel – 28 gauge Type 304
  • Kynar-coated galvanized steel – 24 gauge
  • Cold-rolled copper – 24 gauge

CompleteFlash Inside/Outside Corners & End Dams

  • Synthetic rubber

Metal Drip Edge Corners

  • Pre-formed Outside 90°
  • Adjustable 325° to 22°


  • BTL-1 Butyl
Available in 12" and 18"