Installation Guide

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1. Wood Studs, 16" o.c.
2. Waterproof Membrane
(Plastic Film)* or
3. Liquid-Applied Waterproofing
Membrane*
4. PermaBase Cement Board
5. Corrosion Resistant Screws, 8" o.c.
Tub Installation
6. Fiberglass Mesh Tape
(Alkali-Resistant)
7. Adhesive Or Latex-Portland
Cement Mortar
8. Tile
Ceiling Framing: The deflection
of the complete ceiling assembly due
to dead load (including insulation,
PermaBase, bonding material and
facing material) should not exceed
L/360. The dead load applied to
the ceiling frame should not exceed
10 psf. Ceiling joist or furring
channel should not exceed 16" o.c.
(Edges of PermaBase parallel to
framing should be continuously
supported.) Provide additional
blocking when necessary to permit
proper PermaBase attachment.
PermaBase Cement Board:
Apply PermaBase with ends and
edges closely butted but not forced
together. Stagger ends joints in
successive courses. Drive fasteners
into field of cement board first, work-
ing toward ends and edges. Space
fasteners maximum 8" o.c. for walls,
6" o.c. for ceilings with perimeter
fasteners at least 3/8" and less than
5/8" from ends and edges. Ensure
PermaBase is tight to framing.
Joint Reinforcement: Trowel
bonding material to completely fill
the tapered recessed board joints
and gaps between each panel.
On non-tapered joints apply a 6"
wide, approx. 1/16" thick coat of
bonding material over entire joint.
For all joints, immediately embed
2" alkali resistant fiberglass mesh
tape fully into applied bonding
material and allow it to cure. For
outside corners, 4" wide mesh tape
is recommended. Same bonding
material should be applied to corners,
control joints, trims and other
accessories. Feather bonding mate-
rial over fasteners to fully conceal.
* Water-resistant membrane installed
according to local building codes.
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