Skip to content
MFM Ultra HT Wind & Water Seal High Temperature Underlayment 45 mil, 36 in. x 67 ft., White
Regular price $141.00Orders start at $399 — combine any items to reach the minimum. Learn more
MFM Ultra HT Wind & Water Seal High Temperature Underlayment 45 mil, 36 in. x 67 ft., White
MFM Ultra HT Wind & Water Seal is a 45 mil self-adhering roofing underlayment engineered for whole-roof protection under shingle, tile, shake and metal roofing systems. The white, non-slip cross-laminated polyethylene film is laminated to a high-temperature rubberized asphalt adhesive rated to 250°F. One roll covers 36 in. x 67 ft., installed single-ply direct to the deck.
Key Features:
- High-temperature rated: Rated for high-temperature applications up to 250°F.
- Fastener sealing: Bonds to the substrate and seals around fasteners to limit damage from water penetration or leaks.
- Non-slip surface: White non-slip polymer surface provides excellent foot traction during installation.
- Whole-roof protection: Engineered for whole roof protection under shingle, tile, shake and metal roofing.
- Single-ply application: Installs as a single-ply membrane directly to the roof deck surface.
- Split release liner: Comes with a split release liner for easy installation.
Specifications Table:
| Specification | Details |
|---|---|
| Brand | MFM |
| Sell unit | 1 roll, 36 in. x 67 ft. |
| Product line | MFM Ultra HT Wind & Water Seal |
| Available colors | White |
| Available sizes | 36 in. x 67 ft. |
| Dimensions | 36 in. x 67 ft. per roll |
| Material | Cross-laminated polyethylene film with high-temperature rubberized asphalt adhesive |
| Thickness | 45 mil |
| Finish / texture | White non-slip polymer surface |
| Coverage per unit | Approximately 186 sq. ft. per roll before laps |
| Temperature rating | High temperature applications up to 250°F |
| Intended use | Ice and water / secondary water resistance underlayment |
| Assembly | Self-adhering, single-ply installation direct to deck |
Coverage & How Much You Need:
One 36 in. x 67 ft. roll covers roughly 186 sq. ft.; subtract overlaps and dormer/hip allowances when sizing. Apply laps per the roofing manufacturer's instructions for secondary water resistance.
Fit and Compatibility:
Use under shingle, tile, shake and metal roofing systems as a secondary water barrier. Requires proper roof ventilation as noted for secondary water resistance applications.
Frequently Asked Questions (FAQ):
Q: What roll size is this?
A: One roll measures 36 in. x 67 ft., approximately 186 sq. ft. before laps.
Q: How hot can it get?
A: It is rated for high-temperature applications up to 250°F, suitable under metal and tile.
Q: How is it installed?
A: It installs single-ply directly to the roof deck, self-adhering with a split release liner.
Q: Is it safe to walk on during install?
A: Yes, the white non-slip polymer surface provides excellent foot traction.
Q: What roofing does it work under?
A: It is engineered for use under shingle, tile, shake and metal roofing systems.
Q: Does it seal around nails?
A: Yes, it bonds to the substrate and self-seals around fasteners.
Expert Verdict — Reviewed by the SuperArbor Pro Desk
Ultra HT is the right underlayment where metal or tile will drive deck temperatures beyond the limits of standard asphalt-based membranes. Keep the deck clean and dry, and roll laps firmly so the rubberized asphalt bonds fully. Ensure proper attic ventilation as part of any secondary water resistance design.
The non-slip surface improves traction but does not replace fall protection; use harnesses and follow OSHA roofing safety practices.
Order MFM Ultra HT Wind & Water Seal Underlayment for whole-roof protection under metal, tile, shake and shingle.
All third party trademarks, including logos and icons, referenced on our website and product pages remain the property of their respective owners. Unless specifically identified as such, Arbor's use of third party trademarks does not indicate any relationship, affiliation, sponsorship, or endorsement between Arbor Home and the owners of these trademarks. Any references by Arbor Home to third party trademarks are to identify the corresponding third party goods.
