Change your country/region

It looks like you entered an employee email address, but this is the customer sign-in. Use the link below instead.

Item: 061002

Fiberock® Brand Underlayment

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

Available Product Options

Thickness: 1/4 in.

Width: 3 ft.



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

Main Features

Fiberock® Brand 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.
  • Made from 97% recycled material
  • 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.


  • Multi-Family Residential and Condos
  • Single-Family Residential


Submittal Sheet PDF 212.6 KB


  • Mold & Mildew Resistance Yes
  • ASTM E84
    • Flame Spread 5
  • ASTM Type ASTM C1278; ASTM C36; ASTM D3273-10; ASTM E84
    • Flame Spread 5


  • Recycled Content 95%

Physical Data

  • Thickness (in.) 1/4
  • Edge Square Edge
  • Panel Size 3 ft. x 5 ft.

Documents & Files

Data Sheets & Specifications

Data/Submittal Sheet (English) PDF 212.6 KB

White Papers

Sell Sheet (English) PDF 12.1 MB

Catalogs & Brochures

Brochure (English) PDF 3.1 MB

Installation & Technical Manuals

Installation Guide (English) PDF 928.0 KB

SDS, Certifications & Reports

SDS (English)
SDS (Spanish)


Warranties (English) PDF 158.6 KB


EPD (English) PDF 1.3 MB

Ask a question

Our customer support team will get back to you as soon as possible.

Question Guidlines

  • Questions should relate to this product specifically.
  • For help with pricing, availability, or delivery, please call 800.874.4968 (Monday–Friday, 7am–6pm Central)
  • All questions and answers follow USG’s Terms & Conditions.
  • Your question and USG’s answer may be posted to this page in the future, but none of your personal info will be included.

 Thanks for your message. We’ll be in touch!

q & a

  • Can Fiberock® Brand Aqua-Tough™ Underlayment be used below grade?

    In interior basement finishing applications over wood or metal framing yes; however, not direct ground contact applications.

  • What kind of warranty does Fiberock® Brand Aqua-Tough™ Underlayment have?

    Fiberock® Brand Aqua-Tough™ Underlayment has a 20-year limited warranty. See complete warranty for details.

  • What type of fasteners should be used for Fiberock® Brand Aqua-Tough™ Underlayment?

    Hot-dipped galvanized roofing nails, ring shanked, or Durock™ Brand Wood Screws.

  • Can Fiberock® Brand Aqua-Tough™ Underlayment or Tile Backerboard be used in a wet area?

    Yes. Fiberock® Brand Aqua-Tough™ Underlayment and Tile Backerboard are both recommended in areas where protection against mold and moisture is needed. These products are ideal for residential shower applications were versatility is needed, these panels can be tiled and painted for added installation convience.

  • What is the best way to secure Fiberock® Brand Aqua-Tough™ Underlayment to a sub floor?

    Apply Fiberock® panels to subfloor using 1/4" x 1/4" square notch trowel with Type 1 organic adhesive or latex-modified thin-set mortar or dry-set mortar. Fasten to subfloor with 1-1/4" Durock™ brand tile backer screws for wood framing (or equivalent) or 1-1/2" hot-dipped galvanized roofing nails spaced 8" o.c. in both directions withperimeter fasteners at least 3/8" and less than 5/8" from ends and edges.

  • How should I store leftover Fiberock® Brand Panels and Underlayment?

    Store Fiberock® indoors and protected from the elements. Protect them from extreme heat and cold and do not expose to direct sunlight.

  • Can Fiberock® Brand Aqua-Tough™ Underlayment be used in gang showers, saunas, or steam rooms?

    No. This product should never be used in areas that are exposed to continuous moisture, or heat exceeding 125 degrees.

  • Is it possible to affix ceramic tile to Fiberock® Aqua-Tough™ interior panels?

    Yes, Fiberock® Underlayment Tile Backerboard and Fiberock® Aqua-Tough™ interior panels are ideal substrates for ceramic tile and/or paint.

  • Have a question?

    Let us do the research. We'll get back to you as quickly as we can.

    Ask USG
  • Need help right away?

    Call our Technical Support team at 800-874-4968 (Monday-Friday, 7:30 am - 4 pm Central).