Fortifiber Aquabar "B" Tile Underlayment Roll

Fortifiber Aquabar “B” Tile Underlayment

  • Helps increase the life and appearance of your flooring
  • Protects against moisture vapor
  • For use under tile and wood


Aquabar “B” floor and tile underlayment is an extremely effective moisture vapor retarder for use in a variety of interior construction applications. Consisting of two layers of Kraft paper laminated with asphalt, Aquabar “B” is a non-reinforced 30/30/30 duplex type Grade “B” paper. In the battle against interior moisture damage, the best defense is a strong offense. When you block moisture vapor from creeping underneath finish materials or reaching moisture sensitive substrates, you help increase the useful life and appearance of surface finishes. To help win the battle, the Fortifiber Building Systems Group offers Aquabar “B” as inexpensive insurance to reduce moisture-related problems.

  • Ideal underlayment for interior installations of: ceramic, porcelain or stone over cement board, plywood or concrete; and, finished or unfinished wood floors over plywood or concrete
  • Most commonly used beneath wood flooring, ceramic tile and stone veneer or as a membrane on walls, counter tops, and residential showers
  • An extremely effective moisture vapor retarder for use in a variety of interior construction applications
  • Acts as a slipsheet to minimize dust and reduce noise
  • Meets CA01350 indoor air quality standards



Additional information

Color Family


Commercial / Residential

Flooring Underlayment Benefits

Flooring Type

Subflooring type

Warranty / Certifications
Manufacturer Warranty



Installation Guide

Fortifiber Aquabar "B" Underlayment Installation GuideFortifiber Aquabar "B" Underlayment Installation Guide 2

Product Brochure

Fortifiber Aquabar B Underlayment Product BrochureFortifiber Aquabar B Underlayment Product Brochure 2

Physical Address

304 North Cardinal St.
Dorchester Center, MA 02124