Instructions / Assembly

National Gypsum
recommends the use
of PermaBase Tape
and PermaBase
Screws to complete
your installation.
Tape & Screws
3
Composition
Cementitious Backer Unit
(CBU):
PermaBase Cement Board
is a nailable, screwable backerboard
and underlayment panel which is
composed of Portland cement,
aggregates and reinforcements
that has a significant ability to
remain unaffected by prolonged
exposure to moisture. PermaBase
complies with ASTM C 1325 and
ANSI A118.9.
Accessories
Joint Reinforcement:
PermaBase mesh tape or equivalent
must be used on all edges and cuts
made to size. Use 2" wide polymer-
coated (alkali resistant) mesh tape
for interior applications and 4" wide
polymer-coated (alkali resistant)
mesh tape for exterior applications.
Bonding Materials: Treat joint
and set facing material preferably
with latex-Portland cement mortar
or with dry-set (thin-set) mortar.
All mortars should comply with
ANSI A118.1 or A118.4 standards.
Type 1 organic adhesive meeting
ANSI A-136.1 may be utilized for
interior use only.
Fasteners: Galvanized roofing
nails, 1-1/2" long with hot dipped
galvanized coating, for use with
wood framing. Nails should meet
Federal Specification #FF-N105B/
type 2 style 20.
PermaBase corrosion resistant screws
or equivalent, 1-1/4" or 1-5/8"
long, for use with wood framing.
Type S-12 screws or equivalent,
1-1/4" or 1-5/8" long, for use with
20 ga. or heavier steel framing.
Warranty
䡵 30-year limited warranty for
interior applications.
䡵 10-year limited warranty for
exterior applications.
Limitations
䡵 Joints should be treated with
alkali resistant fiberglass mesh
tape set in a latex-Portland
cement mortar.
䡵 Conventional paper drywall tape,
joint compound and drywall nails
or screws should not be used.
䡵 Maximum wall framing spacing
should not exceed 16" o.c.
and must be designed to limit
deflection to L/360 under all
live and dead loads.
䡵 Steel wall framing must be 20 ga.
(galvanized) or heavier – 16" o.c.
䡵 1/4" PermaBase should not be
used on walls or ceilings.
䡵 PermaBase Cement Board is not
a water barrier. Consult local
building code for moisture barrier
requirements.
䡵 Not recommended for use with
vinyl flooring.
䡵 For exterior and interior finishes
applied direct to PermaBase,
reinforcing mesh must be
embedded in basecoat.
Consult finish manufacturer for
additional requirements.
䡵 PermaBase Cement Board
should not be exposed to tem-
peratures over 220˚F (105˚C).
SIZES & PACKAGING
Size: Thickness, Width & Length # of Pcs. Per Unit
PermaBase Cement Board
1/2" x 32" x 5' (12.7 mm x 813 mm x 1524 mm) 50
1/2" x 36" x 4' (12.7 mm x 914 mm x 1219 mm) 50*
1/2" x 36" x 5' (12.7 mm x 914 mm x 1524 mm) 50
1/2" x 36" x 6' (12.7 mm x 914 mm x 1829 mm) 50*
1/2" x 36" x 8' (12.7 mm x 914 mm x 2438 mm) 30
1/2" x 48" x 8' (12.7 mm x 1219 mm x 2438 mm) 30
5/8" x 36" x 5' (15.9 mm x 914 mm x 1524 mm) 35
5/8" x 48" x 8' (15.9 mm x 1219 mm x 2438 mm) 24
3/8" x 48" x 8' (9.5 mm x 1219 mm x 2438 mm) 40*
3/8" x 36" x 5' (9.5 mm x 914 mm x 1524 mm) 50*
3/4" x 48" x 8' (19.0 mm x 1219 mm x 2438 mm) 20*
1" x 32" x 8' (25.4 mm x 813 mm x 2438 mm) 20*
PermaBase Underlayment
1/4" x 48" x 4' (7.9 mm x 1219 mm x 1219 mm) 50
1/4" x 36" x 5' (7.9 mm x 914 mm x 1524 mm) 50
COMPARISON CHART
Other Fiber
Cement Cement
Physical Feature Benefits PermaBase Boards Boards
Low Weight Glass Mesh Cement Board 䢇 䡬䡬
Reinforced Edge 䢇 䡬䡬
Fastens Near Edge With No Breakout 䢇 䡬䡬
Highest Damage Resistancy From Handling 䢇 䡬䡬
Cleanest To Score And Snap 䢇 䡬䡬
Lowest Water Absorption 䢇 䡬䡬
Meets 40 psf Rating Wind Load Test Results 䢇 䡬䡬
(Stud spacing 16" o.c.)
Cuts With Utility Knife vs. Power Tools 䢇䢇䡬
Standard Fasteners Countersink Into Board 䢇䢇䡬
Can Be Used In Both Residential and 䢇䢇䡬
Commercial Steam Rooms And Saunas
Inorganic vs. Organic Core 䢇䢇䡬
30-Year Warranty For Interior Use 䢇䢇䡬
10-Year Warranty For Exterior Use 䢇䢇䡬
* Special order
Product Feature:
䢇Yes 䡬No