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MFM 18" x 75' 40 mil Subseal Flashing

Brand: MFM Mfg#: 51318
Product#: 430SS4018
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SubSeal-40™ is a prefabricated, 40 mil self adhering sheet-type waterproofing membrane. It is composed of a tough multi-layer high-strength polymer film that is coated with a layer of specially formulated rubberized asphalt adhesive. A release liner protects the asphalt and is removed as the membrane is installed. Mastic selvedge on both edges for improved sealing


  • Around windows and door frames
  • Plaza and balcony decks
  • Floor and planter structures
  • Sills, pot shelves, pony walls and parapets
  • Through-wall flashings
  • Foundation walls
  • Parking garages
  • Under stucco
  • Sealing SIPS building panels or Dens Glass


  • Brand: MFM
  • Temperature Rating: 50 deg F
  • Thickness: 40 mil
  • Material: Polyethylene Film/Rubberized Asphalt
  • Standards: ASTM Specified
  • Color: Black
  • Series: 40
  • Type: Self-Adhering
  • Length: 75 ft
  • Width: 18 in
  • Usage: For Extreme Moisture Protection