Full Product Manual

Construction Guide | 13
General: All framing should comply with local building code
requirements and be designed to provide support with a
maximum allowable deection of L/360 (L/720 for stone) under
all intended loads. Wall framing members shall be spaced a
maximum of 16” o.c. and shall be a minimum of 2”x 4” nominal
(wood) or 20 gauge (metal).
For ooring applications with 16” o.c. oor joists, 5/8” tongue-
and-groove exterior-grade plywood or 3/4” tongue-and-groove
exterior-grade OSB may be used. For 19.2” o.c. and 24” o.c. oor
joists, 3/4” tongue-and-groove exterior-grade plywood or OSB
must be used. Tile size for oors with 24” o.c. oor joists must be
12” x 12” or larger. The joist and suboor assembly must meet
L/360 (L/720 for stone) as well as the appropriate code tables
for live and dead loads. Install tile and tile setting materials in
accordance with current ANSI specications and Tile Council of
North America (TCNA) guidelines.
Control Joints: Consult TCNA Handbook Installation Method
EJ171. Architect, builder or design professional must specify
location of all control joints. For interior installations, 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 structural system; at each story separation.
Place control joints at corners of window and door openings, or
follow specications of architect. Control joint cavity shall not be
lled with coating or other materials.
WALLS
Wall Framing: Edges of PermaBASE WP parallel to framing
should be continuously supported. Provide additional blocking
when necessary to permit proper attachment. Do not install
PermaBASE WP directly over protrusions from stud plane, such
as heavy brackets and fastener heads. Studs above a shower
oor should either be notched or furred to accommodate the
thickness of the waterproof membrane or pan. The surround
opening for a tub or precast shower receptor should not be more
than 1/4” longer than unit to be installed. In mortar bed (mud bed)
applications, PermaBASE Cement Boards can be embedded into
the mud bed per TCNA Handbook method B415-19.
PermaBASE WP: Apply PermaBASE WP with ends and edges
closely butted but not forced together. Stagger end joints in
successive courses. Drive fasteners into eld of board rst,
working toward ends and edges. Space fasteners maximum
8” o.c. for walls, with perimeter fasteners at least 1/2” and less
than 3/4” from ends and edges. Ensure PermaBASE WP is tight
to framing. Install screws ush with surface, do not overdrive
screws.
Joint Reinforcement: Trowel bonding material to completely ll
the board joints and gaps between each panel. Apply a 6” wide,
approx. 1/16” thick coat of bonding material over entire joint.
For all joints, immediately embed 2” alkali-resistant berglass
mesh tape fully into applied bonding material and allow it to
cure. For outside corners, 4” wide alkali-resistant mesh tape
is recommended. Same bonding material should be applied to
corners, control joints, trims and other accessories. Feather
bonding material over fasteners to fully conceal. Bonding
material to be modied dry set mortar compliant with
ANSI A118.4 standards. To create a waterproof system in wet-
area applications, just coat nished joints and fastener heads
with liquid waterproong per manufacturer’s recommendations.
Sealant/Waterproong Application: In areas where waterproof
performance is required, apply approved liquid waterproong/
sealant over cement board joints and fastener heads/
penetrations, as well as any exposed edges. Waterproong must
extend past treated joint onto PermaBASE WP surface a minimum
of 2” on either side of the joint. This includes inside and outside
corners. Follow waterproong manufacturer’s instructions on
application requirements. Once all board joints have been treated
following this procedure, seal all fasteners with approximately a
2” diameter coating of liquid waterproong or approved sealant.
FLOORS AND COUNTERS
Suboor or Base: For ooring applications with 16” o.c. oor
joists, 5/8” tongue-and-groove exterior-grade plywood or 3/4”
tongue-and -groove exterior-grade OSB may be used. For 19.2”
o.c. and 24” o.c. oor joists, 3/4” tongue-and-groove exterior-
grade plywood or OSB must be used. Tile size for oors with 24”
o.c. oor joists must be 12” x 12” or larger. The joist and suboor
assembly must meet L/360 as well as the appropriate code
tables for live and dead loads.
Underlayment: Using a 1/4” square-notched trowel, apply a
setting bed of polymer-modied mortar (or thin-set mortar) to the
suboor or counter base. Immediately laminate PermaBASE WP
to suboor or base with ends and edges closely butted but not
forced together. Leave a 1/4” gap along walls. Stagger all joints
so that they do not line up with underlying substrate joints. Fasten
PermaBASE WP every 8” o.c. throughout board eld and around
all edges while setting bed mortar is still workable. Around
perimeter of each board, locate fasteners 2” from corners and
not less than 3/8” from the edges. Fill all joints solid with bonding
material. On non-tapered joints such as butt ends, apply a 6” wide,
1/16” thick coat over the entire joint. For all joints, immediately
embed 2” alkali-resistant berglass mesh tape fully into applied
bonding material; ensure that tape is centered over joint. Apply
bonding material over fasteners to fully conceal. Remove all
excess bonding material and allow to cure.
Installation of PermaBASE WP
®