#80 Ultima™ Base Sheet

#80 Ultima Base Sheet

Why GAFGLAS® #80 Ultima Base Sheets?

In applications where the potential cost of damage from leaks is severe, #80 Ultima Base Sheets offer ultimate leak protection and serve as an effective flame retarder in torch-applied modified bitumen systems. Designed to meet UL Class A ratings, they roll out flat for easy installation and system guarantees are available for up to 20 years.


  • Helps prevent splitting and leakage:  closed-pore design means asphalt doesn’t bleed through, so system remains independent of deck movement when mechanically attached
  • Rolls out flat for easy installation
  • Resists long-term curling and shrinkage that can cause premature roof failure (as can happen with organic products)
  • Inorganic Micro Weave Core helps prevent decay and provides superior tensile strength with dimensional stability


The heavyweight construction is ideal for all premium roofing systems to provide leak protection and serve as a flame retarder in place of organic felts under tile roofs, or in BUR systems.  Also ideal for nailable systems in which bleed-through can cause premature failure from deck movement (especially plywood decks), and for difficult roofing situations where the performance of a lighter-weight base sheet is inadequate.


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