Installation Guide

16
Installation Guide
Floors And Counters
Subfloor Or Base: For flooring
applications with 16" o.c. floor
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. floor joists, 3/4"
tongue and groove exterior grade
plywood or OSB must be used. Tile
size for floors with 24" o.c. floor
joists must be 12" x 12" or larger.
The joist and subfloor 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-modified
mortar (or thin-set mortar) to
the subfloor or counter base.
Immediately laminate PermaBase
to subfloor or base leaving a
1/8" space between boards at
all joints and corners. Leave a
1/4" gap along walls. Stagger all
joints so that they do not line up
with underlying substrate joints.
Fasten PermaBase every 8" o.c.
throughout board field 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
2
1
6
4
3
5
Countertop Installation
1. Plywood
2. Latex-Portland Cement Mortar
3. PermaBase Cement Board
4. Fiberglass Mesh Tape
5. Latex-Portland Cement Mortar
6. Tile
1
2
3
4
5
6
8
7
Shower Seat Detail
1. PermaBase
Cement Board
2. Waterproofing
Membrane
3. Latex-Portland
Cement Mortar
4. Min. 1/2" Plywood
5. Supporting Framing
(slope 1/4" per foot
toward drain)
6. Flexible Sealant
(Min. 1/8" gap)
7. Sloped Concrete
8. Membrane
Knee Wall Detail
1
4
2
3
1. Waterproofing
Membrane
2. PermaBase
Cement Board
3. Corrosion
Resistant Screws,
8" o.c.
4. Framing
Shower Receptor Detail
1
2
3
4
5
6
1. Tile
2. Adhesive or
Latex-Portland
Cement Mortar
3. PermaBase
Cement Board
4. Flexible Sealant
(Min. 1/8" gap)
5. Shower
Receptor
6. Subfloor
1
2
3
4
5
6
7
8
9
10
Shower Pan Detail
1. Tile
2. Adhesive or
Latex-Portland
Cement Mortar
3. PermaBase
Cement Board
4. Flexible Sealant
(Min. 1/8" gap)
5. Sloped Mortar
Bed
6. Waterproofing
Membrane
7. Crushed Stone
8. Weep Holes
9. Drain
10. Subfloor
2
1
7
4
3
6
5
Floor Underlayment
1. I-Joists
2. Plywood
3. Latex-Portland
Cement Mortar
4. PermaBase
Cement Board
5. Fiberglass Mesh Tape
(Alkalin Resistant)
6. Latex-Portland
Cement Mortar
7. Tile
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" fiber-
glass mesh tape fully into applied
bonding material; ensure that tape
is centered over joint. Apply bond-
ing material over fasteners to fully
conceal. Remove all excess bond-
ing material and allow to cure.
Limitations

Joints should be treated with
alkali resistant fiberglass mesh
tape set in a polymer modified
mortar.

Conventional paper drywall tape,
joint compound and drywall nails
or screws should not be used.

Maximum wall framing spacing
should not exceed 16" o.c.
and must be designed to limit
deflection to L/360 under all
live and dead loads.

Steel framing must be 20 gauge
(galvanized) or heavier – 16" o.c.

1/4" PermaBase and 1/4"
UltraBacker should not be used
on walls or ceilings.

PermaBase is not a water barrier.
Consult local building code for
moisture barrier requirements.

Not recommended for use with
vinyl flooring.

For exterior and interior finishes
applied directly to PermaBase,
reinforcing mesh must be
embedded in basecoat. Consult
finish manufacturer for addi-
tional requirements.

PermaBase should not be
exposed to temperatures over
220°F (105°C).

PermaBase is not a nailing base
for other finishes.