PermaBase™
PermaBase Cement Board is ideal as an underlayment for interior and exterior applications in high moisture areas, such as shower enclosures, around bathtubs, sinks garden tubs, as well as swimming pool and whirlpool decks.  PermaBase can also be used as an underlayment for exterior soffit panels and other sheathing devices.
PermaBase Cement Board provides a strong, stable substrate for interior and exterior countertops and other similar residential and commercial applications.  In fact, 5/16" PermaBase is ideal for remodeling applications because it can be applied directly over existing countertop surfaces.
PermaBase Floor Underlayment is 5/16" thick and gives you a real edge because it eliminates the need to modify adjacent thresholds when abutting to carpeting, wood flooring and other common flooring materials.
PermaBase Flex™
Description : Polymer-modified cement board reinforced with an alkali resistant fiber mesh ideal for use around ceilings, bearms, columns, arches and archways, walls and anywhere an evenly curved surface is required.






Features : 
  • 6"(150 mm) minimum radius for 90° corners.
  • Bends immediately, easily and evenly.
  • The only 1/2" lightweight cement board that bends.
  • Can be bent without water saturation or kerf cuts.
  • Easy installation, reduces skilled labor costs.
  • Easy to cut and install with screws.
  • Can be used for interior or exterior applications
  • Impact resistant.
  • Creates uniform curved surfaces
  • Unaffected by water or moisture.
  • Dimensionally Stable.
Sizes / Packaging : 
  • 1/2" (12.7 mm)
  • 4' (1219 mm)
  • 8' (2438 mm)
  • 2.85 lb./ft (13.9 kg/m)
  • 30 boards per package.
For more information on these products please view the National Gypsum web site.