The MFM Ultra HT Wind & Water Seal Underlayment is a 45-mill, self-adhering, waterproofing underlayment composed of a white, non-slip, cross-laminated polymer film. This Premium Self-Adhering Waterproofing Protection Underlayment features a film laminated to a high-temperature rubberized asphalt adhesive with a paper backing that easily tears off before installation. Ultra HT is engineered for use under asphalt shingles and metal roofing systems. The waterproof shingle underlayment can also be used in valleys, ridges, around chimneys, at eaves for protection against ice damns and wind-driven rain, or as a whole roof covering for secondary water resistance. MFM’s Ultra HT Wind & Water Seal bonds to the substrate and seals around fasteners to limit the damage caused by water penetration or leaks. This self-sealing roof underlayment must be covered within 90 days after application. MFM backs the Ultra HT Wind & Water Seal Underlayment with a 10-year limited warranty.

Please Note: MFM has signed a Trademark License Agreement with Fortified, which is a voluntary construction and re-roofing program designed to strengthen homes and commercial structures against severe weather, such as high winds, hail, hurricanes, and even tornados. This product meets or exceeds the requirements set forth by the program. Read more about Fortified below.

Roll Length: 67 Feet
Roll Width: 36 Inches
Roll Coverage: 200 Square Feet
Roll Weight: 55 Pounds
Roll Thickness: 45 mils.
Compliant Codes: ASTM D 5147, ASTM D 1970, ASTM E 96, ASTM D 903/1970, Florida Building Code FL# 11842.5, Miami-Dade County approved, ICC-ES ESR 1737, Texas Department of Insurance listed, and CCMC 14048-L.
Rated for High Temperature applications up to 250 degrees Fahrenheit
Must be installed at a temperature >50 degrees Fahrenheit
Non-slip polymer surface for excellent foot traction
High elongation and flexible to accommodate expansion and contraction
Seals out water to prevent damage
Minimum roof slope of 2:12 is required (check local building codes for required roof slope)
Aggressively adheres to plywood, metal and most building materials

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MFM Ultra HT Wind & Water Seal Underlayment – Single Roll