Full Product Manual
16 | PermaBASE Building Products
Interior and Exterior
Applications
Installation
Guide
For installation accessories, see page 20.
Interior Installation of PermaBASE®
and PermaBASE PLUS®
General: All framing should comply with local building code
requirements and be designed to provide support with a maximum
allowable deection of L/360 (L/720 for stone) under all intended
loads. Framing members should be spaced a maximum of 16"
o.c. Cut or score PermaBASE
®
Cement Board on printed side of
panel. Use a straightedge and pencil to mark line. Use utility knife
to score/cut the glass mesh. Snap the board and cut through the
now visible glass mesh on the other side. Install tile and tile setting
materials in accordance with current ANSI specications 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
specications of architect. Control joint cavity shall not be lled
with coating or other materials.
WALLS AND CEILINGS
Wall Framing: Edges of PermaBASE parallel to framing should
be continuously supported. Provide additional blocking when
necessary to permit proper attachment. Do not install PermaBASE
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.
Ceiling Framing: The deection 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 eld of cement board
rst, working 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 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 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 material over fasteners to fully conceal.