PermaBASE WP® Waterproof Cement Board

Waterproof core for wet areas where waterproof applications are desired.





Prevent water intrusion

For wet areas where waterproof applications are desired
  • Waterproof Core
  • Moisture & Mold Resistant
  • EdgeTech® Reinforced Edge
  • Easy to Cut

PermaBASE WP® Waterproof Cement Board combines the strength and benefits of PermaBASE® Cement Board with a proprietary waterproofing formulation. Intended for use in interior wet areas around tubs and showers, PermaBASE WP is perfect for instances where liquid waterproofing has historically been applied over cement boards.


  • Waterproof core prevents water from causing harmful damage.
  • Passes ANSI A118.10 for waterproofness.
  • Helps inhibit mold growth with the highest possible score on mold tests (ASTM D3273 and ASTM G21).
  • Smooth surface; strong bond.
  • Lightweight and easy to cut.

Interior Applications

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Video: PermaBASE WP® Waterproof Cement Board



Products that suit any project criteria

Product Details


Shower, Kitchen, Fireplace, Bathtub, Accent Wall, Heat Shield, Floors, Sauna / Steam Room


EdgeTech® Reinforced Edge




36", 48"

Related Resources

Product details and technical documentation

Code Reports

Drop-In Specs

UL GREENGUARD Certification

Frequently Asked Questions

Ready to answer your product and installation questions

What makes PermaBASE WP waterproof?

Special additives are added to the cement core to provide the waterproof performance to meet ANSI A118.10 requirements for waterproofness.

What do I tape the PermaBASE WP board joints with?

2” Alkali resistant mesh tape and mortar mix.

How do I create a waterproof installation?

All joints and fastener heads must be treated with waterproofing material to complete the waterproof installation.

What kind of fasteners do I use to install PermaBASE WP?

Corrosion resistant screw or galvanized roofing nails. Strongly suggest PermaBASE screws since they do not have nibs like competitor screws.

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Expert Connection

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National Gypsum Company is the exclusive service provider for products manufactured by PermaBASE Building Products, LLC.