USG Fiberock® Underlayment

A water-resistant underlayment that delivers support for hardwood, ceramic tile, carpeting and more in homes or light commercial building.

USG Fiberock® Underlayment represents a new era in substrate performance for wet or dry areas. It has an integral water-resistant composition that offers durability, superior performance and exceptional tile bond that is not susceptible to the same warping often found in traditional wood underlayment.

Customer Service Center
1-800-950-3839
7 a.m. - 6 p.m. CT, Mon - Fri

USG4YOU Tech Support
1-800-USG4YOU (1-800-874-4968)
7:30 a.m. - 4 p.m. CT, Mon - Fri

Email USG Technical Support

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Frequently Asked Questions

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features and benefits

USG Fiberock® Underlayment provides a smooth, flat surface that resists swelling and contains none of the resins, adhesives or solvents that can stain floor covering materials. It also offers greater resistance to indentation than other underlayment products and can be used in all areas — wet or dry — regardless of the flooring material chosen.

  • Certified recycled content of 95 percent
  • Uniform composition provides both strength and water resistance
  • Use in both wet and dry areas throughout the home
  • Ideal under tile, stone, vinyl, hardwood flooring, laminate flooring and carpeting
  • Superior tile bond — three times industry standard
  • Recognized by major resilient-flooring and adhesive manufacturers
  • Free of resins, adhesives, and solvents that might stain a vinyl floor
  • Provides a smooth, flat, paintable surface for wall applications.
  • Easy to cut, fasten and install
  • Made in the U.S.A.

Customer Service Center
1-800-950-3839
7 a.m. - 6 p.m. CT, Mon - Fri

USG4YOU Tech Support
1-800-USG4YOU (1-800-874-4968)
7:30 a.m. - 4 p.m. CT, Mon - Fri

Email USG Technical Support

Design & Specification
Assistance
Find your local architectural representative

Frequently Asked Questions