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SubSeal Self-Adhering Waterproofing Membrane

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 Product Description

SubSeal-40 & SubSeal 60 Adhering Waterproofing Membrane

MFM SubSeal is a 40 or 60 mil thick, (depending on the model #) prefabricated 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 sheet protects the asphalt and is removed as the membrane is installed. Mastic selvedge on both edges for improved sealing. SubSeal is engineered to be a multi-purpose waterproofing sheet suitable for use under siding, exterior plaster, as a through wall flashing or in sub-grade applications where the membrane is protected from long-term ultraviolet exposure. SubSeal adheres aggressively to most clean, dry substrates including metal, wood vinyl and masonry. SubSeal may be used in foundations and other below grade structures, plaza decks, balcony waterproofing, under siding, exterior plaster and as a through wall flashing. SubSeal complies with ICC-ES AC148 (ICC-ES ESR-2783) and ICC-ES AC38 (ICC-ES ESR-3980).


SubSeal™ is designed for Extreme Moisture Protection

SubSeal is engineered to be a multipurpose waterproofing sheet suitable for above and below grade, as well as vertical or horizontal applications. Intended uses include:

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

SubSeal adheres aggressively to most clean, dry substrates including metal, wood vinyl and masonry. It is self-sealing around fasteners to prevent water penetration. The special waterproofing adhesive has a broad temperature range allowing installation in cold weather.  SubSeal carries a 10-Year Limited Warranty.

SubSeal™ meets the requirements of ICC-ES AC148 - report ICC-ES ESR-2783, and ICC-ES AC38 - report ICC-ES ESR-3980.


Prior to installation on concrete, the surface must be primed with an asphalt based primer. The following are a list of asphalt based primers approved by MFM:

  • APOC 103
  • Bulldog Asphalt Primer
  • Karnak 108
  • Lucas 315

When installed over a wood or metal surface, a primer is not required.


Cold Temperature Installation:
If installing SubSeal in temperatures below 50 degrees, a spray adhesive is recommended for optimal adhesion. The following adhesives are approved by MFM:

  • 3M HI TEK
  • 3M 77


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 Product Reviews

  1. SubSeal-60™ 37" x 60'

    Posted by Allen Luu on Jul 9th 2019

    I bought this product for my house Exterior below grade Foundation waterproofing with J Drain 400 Series - wall Drainage. Now I order some more for window replacement with new construction style around the window and wall wire with Stuccoing. It's work great.

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