Instructions / Assembly

Applications
An ideal underlayment for
interior applications such as:
䡵 Shower and tub enclosures
䡵 Garden/whirlpool tubs
䡵 Countertops
䡵 Backsplashes
䡵 Steamrooms and saunas
䡵 Swimming pool and whirlpool
decks and enclosures
䡵 Floor underlayment
– Entryways
– Kitchens
– Bathrooms
– Foyers
– Laundry rooms
Installation
General: All framing should comply
with local building code require-
ments and be designed to provide
support with a maximum allowable
deflection of L/360 under all intend-
ed loads. Framing members should
be spaced a maximum of 16" o.c.
Note: Cut or score PermaBase on
printed side of panel. Install tile
and tile setting materials in accor-
dance with current ANSI specifica-
tions and Tile Council of America
(TCA) guidelines.
Control Joints: For interior installa-
tions, allow a maximum of 30 lineal
feet between control joints. A control
joint must be installed but not limited
to the following locations: where
expansion joints occur in the framing
or building (discontinue all cross furring
members located behind joint); when
boards abut dissimilar materials;
where framing material changes;
at changes of building shape or struc-
tural system; at each story separation.
Place control joints at corners of
window and door openings, or follow
specifications of architect. Control
joint cavity shall not be filled with
coating or other materials.
WALLS & CEILINGS
Wall Framing: Edges of PermaBase
parallel to framing should be contin-
uously supported. Provide additional
blocking when necessary to permit
proper PermaBase attachment.
Do not install PermaBase directly
over protrusions from stud plane
such as heavy brackets and fastener
heads. Studs above a shower floor
should either be notched or furred
to accommodate the thickness of
the waterproof membrane or pan.
The surround opening for a tub or
Interior Applications
4
precast shower receptor should not
be more than 1/4" longer than unit
to be installed.
Ceiling Framing: The deflection
of the complete ceiling assembly
due to dead load (including insula-
tion, 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, working toward
ends and edges. Space fasteners
maximum 8" o.c. for walls, 6" o.c.
for ceilings with perimeter fasteners
TUB & SHOWER SURROUND
PermaBase
Cement Board
Tile
Adhesive or
Latex-Portland
Cement Mortar
XP
®
Gypsum
Board
Fiberglass
Mesh Tape
(Alkali Resistant)
PermaBase
Cement Board
Screws, 8" o.c.
PermaBase
Cement Board
2"x 4" Wood Studs
or 20 ga. 3-5/8"
Metal Studs 16" o.c.