Air & Water-Resistive Barrier Coatings
UltraSpan™ UST/USM Silicone

UltraSpan™ UST/USM Silicone

Stable. Flexible. Breathable.

Protect and seal every part of your building envelope with confidence, with UltraSpan UST/USM silicone accessories.

Available in:
North AmericaLatin AmericaEurope, Middle East & AfricaIndia & PakistanSoutheast AsiaAustralia & New ZealandJapanChina

UltraSpan UST/USM (Ultimate Tensile Strength/Ultimate Silicone Molded)strips, sheets, and corners form an enduring, dependable and weatherproof seal in flashing and transitions applications.

UltraSpan UST/USM silicone accessories offer the ultimate in long-term performance. Manufactured from pre-cured silicone rubber, they are resistant to UV radiation and extreme temperatures and will not become brittle in cold or soften in heat, decade after decade.

Our silicone accessories securely bond to substrates using Elemax™ Liquid Flashing, SilPruf™ sealant, SWS, or in some cases, Elemax 2600 coating.

UltraSpan UST/USM silicone accessories are backed by world-class technical support and extended warranties of up to 20 years when used with the Elemax system.

  • Pre-cured, transition sheets, strips, and corners
  • 100% silicone
  • Weatherproof
  • Permanently flexible


  • Low modulus, pre-cured material flexes in unison with substrate surfaces
  • Maintains flexibility at transitions and joints


Allows barrier systems to breathe, not just coated wall areas

Exceptional durability

  • 100% silicone
  • Excellent long-term resistance to UV radiation, extreme temperatures, rain, and snow with negligible changes in elasticity
  • Stable in extreme temperatures, from -55° to 400°F (-48°C to 204°C)

Easy to apply

  • Fully compatible with all AWB and system sealants, liquid flashings, and coatings
  • Position by hand to seal in the appropriate Elemax™ sealant, liquid flashing, or other companion product, then firmly embed with roller, and trowel edges smooth
  • Translucent products visually evidence continuous contact with sealant or flashing


Manufacturer warrants this product meets manufacturer's specifications if properly stored and applied. If not satisfied, return proof of purchase for refund. Manufacturer shall not be liable for damages in excess of the purchase price. This is the sole and exclusive remedy/liability for product defects/failure. This warranty is in lieu of all other warranties, express or implied, including any warranty of merchantability or fitness. You may also have other rights that vary from state to state, so the above limitations/exclusions may not apply to you.

Labor and material warranties for up to 20 years may be available. Inspection of the completed project by a third-party engineering firm is required for warranty validation. See individual product labels for additional information.


Customers must evaluate the product and make their own determination as to fitness of use in their particular applications. See the applicable product data sheets for additional product information.

Product Video

Currently available in translucent and black.

Available Sizes

Product sizes

UST silicone strips come in 100-foot (30.5 m) rolls in standard widths:

  • 3 inch (76 mm)
  • 6 inch (152 mm)
  • 12 inch (305mm)

Custom UST silicone sheets come in flat sizes up to 48 inches (1220 mm) wide.

USM silicone corners are packaged 24 pieces per box.

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