MFM Facebook Page MFM LinkedIn Page MFM Youtube Channel MFM RSS Feed
Quick Product Search:
5.18.2017 - MFM is pleased to announce that we have been awarded a third-straight Gold Key Award. Click for the full story...
3.24.2017 - SubSeal-40 and SubSeal-60 comply with AAMA 711-13 standards as window and door flashing tapes. Read more...
12.13.2016 - MFM announces the company's trade show schedule for 2017. Click for complete details...
Projects & Applications
Resource Center
MFM Product Literature
MFM Technical Data Sheets
MFM Guide Specifications
MFM Installation Instructions
MFM SDS Sheets
MFM Product Approvals
MFM Warranties
MFM Drawings
MFM Made in USA Letter
Industry Links
Roofing Contractors Associations
Industry Associations
Industry Publications
Industry Trade Show
MFM Rep Log In
Movie Image
WindowWrap Video
YouTube Channel




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.

SubSeal-40™ is designed for Extreme Moisture Protection

SubSeal-40 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-40 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-40 carries a 10-Year Limited Warranty.

Installation Instructions  

Technical Data  

Product Brochure




Product ID



Carton Wt.



36” x 75’


62 lbs



18” x 75’


62 lbs



12” x 75’


62 lbs



9” x 75’


62 lbs



6” x 75’


62 lbs

Tags: waterproofing membrane, self adhering waterproofing, self stick waterproofing, self stick membranes, below grade waterproofing, above grade waterproofing, weatherproofing membranes, horizontal flashing, vertical flashing, through wall flashing, through wall flashings, through wall waterproofing, waterproofing, concrete waterproofing, tile waterproofing, concrete membranes, tile membranes, window flashing, window tape, damp proofing, weatherproofing damp proofing

© 2017 MFM Building Products Corp. | 525 Orange Street | Coshocton, OH 43812
Phone: (800) 882-7663 | Fax: (740) 622-6161 | Email Us

MFM Building Products
Help Us Help You

Please take a second and let us know which best describes you:

Thank you for your input!