FIBEROCK® Aqua-Tough™ Underlayment Panels
FIBEROCK Aqua-Tough underlayment is a unique, fiber-reinforced gypsum product that represents a new era in substrate performance for wet or dry areas. It provides a smooth, uniform surface that is an excellent substrate for a variety of floor coverings. It is engineered to meet water-, mold-, and indentation-resistance needs under resilient flooring, ceramic tile, carpeting, hardwood flooring, and laminate flooring. This versatile interior underlayment has a uniform, water-resistant composition that helps prevent the problems typically associated with wood based underlayments, and is lighter weight and easier to cut than fiber-cement panels.
It is environmentally friendly, made from 95-percent recycled materials, earning it Green Cross Certification from Scientific Certification Systems.
Tested by Tile Council of North America (ASTM C627-Robinson Floor Test), the underlayment meets requirements for residential and light commercial use (as defined by TCNA). It also includes a 20-year warranty against buckling, warping, delamination, cracking, and splitting by fasteners.
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FIBEROCK® Underlayment Installation Video (English) - F305
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USG Underlayment Backerboard Remodeling
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Quick Facts
- Mold Resistant
- 95% Recycled
- Building Environments:
- Single-Family Residential,
- Multi-Family Residential/Condos

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Underlying Confidence
Offers water-resistant performance in residential and light commercial applications.
