Used in shipbuilding and other applications, ULTIMATE U Seaprotect provides excellent fire protection in addition to superior thermal and acoustical performance. It is a non-combustible, high temperature insulation composed of high melting temperature fibers that delivers substantial weight savings compared to traditional stone wool marine insulation. It is available unfaced or faced on one side with fiber scrim-reinforced aluminum facing (FSK), black glass tissue, glass fiber fabric or wire mesh.


  • High-performance fire protection tested to the most rigorous standards
  • Significant weight savings (up to 50%)
  • Excellent thermal and acoustic performance
  • Fast and efficient installation
  • Easy handling
  • Considerable advantages for storage and transportation


Technical Information

Click links to access technical specifications, safety data sheets and documents.


CertainTeed recommends that all installations be approved and certified by the local approval bodies. Approved assemblies for specific fire ratings are available upon request.

Warranty Details

Inasmuch as CertainTeed has no control over the installation design, installation workmanship, accessory materials, or conditions of application, CertainTeed does not warrant the performance or results of any installation containing its products.

Sustainability Information

For information on sustainability and environmental impact of ULTIMATE Marine Insulation, visit

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