Technical Specifications

8
Masonry Veneer Installation Systems (MVIS)
PermaBase as a
component of MVIS
Systems
The use of adhered manufactured
stone and thin brick masonry
v
eneers is increasing in popularity.
Masonry Veneer Installation Systems
(MVIS) have been designed to offer
complete, engineered solutions for
the installation of manufactured
and natural stone masonry veneer,
as well as thin brick veneers.
These systems have been developed
and are marketed by various manu-
facturers of the adhering materials
used to install them as well as the
veneer manufacturers themselves.
MVIS Systems offer increased
performance by utilizing polymer
modified adhesive mortars which
have been designed for hanging
materials versus type S and N
mortars that were primarily designed
for stacking materials. In some cases
these systems offer warranties.
Several of these systems call for the
use of an ASTM C 1325 cement
board. In addition to meeting this
requirement, the features and ben-
efits of PermaBase Cement Board
make it an ideal component for
use in these systems.
Advantages
Durability/Strength: Moisture
resistant, durable PermaBase
Cement Board substrates are
applied over a primary sheathing
to provide a durable, dimensionally
stable surface to adhere veneers to.
Consistency: PermaBase is
produced in a factory controlled
environment which provides for
a consistent product produced
within tighter tolerances than can
be achieved with field fabricated
substrates.
The information in this section of the PermaBase Exterior Applications
Guide provides information on how to utilize PermaBase within an MVIS
System. While some typical examples are shown below for reference
purposes, the specifications and details on how to design and construct
individual systems should be obtained from the adhering material or
veneer manufacturer of the materials that are being used to complete
the system.
For more information go to
permabase.com/MVIS.
Cutting and handling:
PermaBase is produced with its
patented EdgeTech technology. The
tapered, reinforced edge design
allows for fastening of nails or
screws closer to the edge without
crumbling or spinout. The homo-
geneous core provides a very clean
score and snap using a standard
drywall knife.
Low Water Absorption:
PermaBase has the lowest water
absorption of any cement board
which provides greater open time
and increased workability of the
adhering materials used in the
application of veneer products.
Limitations
Use is limited to residential and
low-rise commercial applications.
MVIS Systems utilize a primary
sheathing beneath the PermaBase
cement board to provide required
structural performance. The
selection and installation of this
sheathing varies according to the
type of wall construction.
The details below are provided to
give a general sense of representa-
tive MVIS Systems only.
Water Resistant
Barriers (WRB)
While PermaBase is unaffected by
moisture, a water resistant barrier
(WRB) must be installed to protect
the cavity. One of the advantages
of MVIS is the ability to incorporate
an effective, accountable water
management system. The type and
specific placement of the water
barrier will vary based on local
building codes and/or manufactur-
ers warranties. Consult the WRB
manufacturer’s recommendations
for specific installation guidelines.
PermaBase
Cement Board
Liquid Water Resistant
Barrier (WRB)
4" Alkali-Resistant
Mesh Tape
Acceptable Sheathing
Polymer Modified
Adhesive Mortar
Thin Brick
PermaBase
Cement Board
Plywood or Other
Structural Sheathing
#15 Felt
(Double-Layered)
as required
Liquid Water Resistant
Barrier (WRB)
Polymer Modified
Adhesive Mortar
Manufactured Stone
#15 Felt
(Double-Layered)
as required
Thin Brick Exterior Metal Stud Assembly
Manufactured Stone Exterior Wood Stud Assembly
4" Alkali-Resistant
Mesh Tape
PermaBase Exterior Advantages
䡵
Factory produced substrate consistently manufactured to strict
ASTM C 1325 standards
䡵
Time and labor saving alternative to field applied metal lath,
brown and scratch coat substrates
䡵
Reduced dependence on jobsite weather conditions
䡵
Qualifies for systems warranty