Technical Specifications

PermaBASE
®
Cement Board
(Continued from page 1)
INSTALLATION RECOMMENDATIONS
Interior Applications
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 under all intended loads. Framing
members should be spaced a maximum of 16 in. o.c.
Note: Cut or score PermaBASE on printed side of panel. Install tile and
tile setting materials in accordance with current ANSI specications
and Tile Council of North America (TCNA) guidelines.
Control joints: For interior installations, allow maximum of 30 lineal
feet between control joints. A control joint must be installed, but is 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 & Ceilings
Wall framing: Edges of PermaBASE parallel to framing should be
continuously 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 or fastener heads. Studs above a shower oor
should be either 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 in. larger than
unit to be installed.
Ceiling framing: The deection 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 in. 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 end joints in successive
courses. Drive fasteners into eld of cement board rst, working
toward ends and edges. Space fasteners maximum 8 in. o.c. for walls,
6 in. o.c. for ceilings with perimeter fasteners at least 3/8 in. and less
than 5/8 in. from ends and edges. Ensure PermaBASE is tight to framing.
Joint reinforcement: Trowel bonding material to completely ll 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 berglass mesh tape fully into applied bonding material and
allow to cure. Same bonding material should be applied to corners,
control joints, trims or other accessories. Feather bonding material
over fasteners to fully conceal.
Floors & Counters
Suboor or Base: For ooring applications with 16 in. o.c. oor joists,
5/8 in. tongue and groove exterior grade plywood or 3/4 in. tongue
and groove exterior grade OSB may be used. For 19.2 in. o.c. and 24 in.
o.c. oor joists, 3/4 in. tongue and groove exterior grade plywood or
OSB must be used. Tile size for oors with 24 in. o.c. oor joists must
be 12 in. x 12 in. or larger. The joists 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 in. square-notched trowel, apply a setting bed
of Latex-Portland Cement mortar or Thin-Set mortar to the suboor or
counter base. Immediately laminate PermaBASE to suboor or base
leaving a 1/8 in. space between boards at all joints and corners.
Leave a 1/4 in. gap along walls. Stagger joints so they do not line up
with underlying substrate joints. Fasten PermaBASE every 8 in. o.c.
throughout board eld and around all edges while setting bed mortar
is still workable. Around perimeter of each board, locate fasteners 2
in. from the corners and not less than 3/8 in. from the edges. Fill all
joints solid with bonding material. On non-tapered joints such as butt
ends, apply a 6 in. wide, 1/16 in. thick coat over the entire joint. For all
joints, embed 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.
Exterior Applications
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 under all intended live (including wind)
and dead loads.
Control joints: For exterior installations, consult nish manufacturer
for spacing requirements. For exterior tile applications, control joints
should be spaced a maximum of every 12 ft. If no recommendation is
available, allow a maximum of 16 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.
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