Technical Specifications

4. TECHNICAL DATA (Cont.)
ProSpec
®
Heavy-Duty Stone Veneer Mortar has been tested
under laboratory conditions to meet or exceed the following
performance standards:
• Meets or exceeds requirements of ASTM C-270 Table 2 for
Type S and Type N Mortar
• Meets or exceeds requirements of ANSI A118.4 and ANSI
A118.11 American National Standard Specifications for Latex
-Portland Cement Mortar
Product Enhancement
Expansion Stabilization Technology (EST™) -
Special additive designed to reduce the potential
for cracking and shrinkage.
Packaging
• Gray: 40 lb. (18.1 kg) bag (BOM #120444)
Shelf Life
12 months from the date of manufacture when stored in the
original, unopened container, away from moisture, under cool,
dry conditions and out of direct sunlight.
5. INSTALLATION
Preparation
Refer to selected stone manufacturers installation instructions
for more complete instructions. Install in accordance with all
local building code provisions and applicable ASTM standards.
 Stone veneer units must be clean, free from dirt, loose
particles, wax, sealers, curing compounds, grease, paint,
efflorescence, and any foreign materials that could inhibit
adhesion.
 Apply to properly installed ProSpec
®
Polymer-Modified Stone
Veneer Base Coat (“Step 1” in ProSpec
®
Stone Veneer
System).
 Walls must be plumb and true with square corners, free of
movement, and structurally rigid and sound enough to
support the veneer finish.
 For best results all materials should be conditioned to
40°F-80°F (4°-27°C) 24 hours prior to installation.
Note: It is the responsibility of the installer/applicator to ensure the
suitability of the product for its intended use.
Mixing
1. Use cool, clean, potable water in the range of 50º-80ºF (10º-
27ºC) for mixing. Always use clean tools and mixing
containers. Mix with water only, no bonding additives.
2. Add just enough dry mix to the liquid, begin with 4.25 qt. (4.0
L) water per 40 lb. (18.1 kg) bag. Add additional water
sparingly up to 5.0 qt. (4.7 L) total, while mixing 3-5 minutes.
Too much water will cause reduced strength.
3. Mix with low speed (150-300 RPM) ½” (13 mm) drill or by
hand. Mortar should be a smooth, firm, uniform, lump-free
consistency, workable to be trowelable, and stiff enough to
retain ridges and peaks when troweled on a horizontal or
vertical surface. Avoid high-speed mechanical mixing which
can entrap air into the mixture, reducing mortar strength.
4. Let mortar slake/rest for 5-10 minutes, Remix again for 2
minutes and use. Do not add additional powder or liquid after
slaking, as this may cause shrinkage and poor bonding. Stir
occasionally to keep fluffy. Maintain water and mixing time
consistency among batches.
5. Bucket life is approximately 3 to 4 hours, at normal
temperatures of 70°F (21°C). Warmer temperatures will
reduce the bucket life. Do not mix more product than can be
placed in 3 hours. Mortar shall be used and placed in final
position within 3-4 hours after initial mixing or discarded at
that time.
Application
Apply only to surfaces that are frost free and between
50°F-90°F (10°C-32°C) within 24 hours of application and 72
hours thereafter. Do not apply in direct sunlight on hot, windy
days, or when rain is expected within 24 hours.
 Follow stone veneer manufacturers instructions for layout,
installation, and techniques. Stone veneer units can be laid
from the bottom of the wall up or top down. Starting at the
bottom helps support the weight of the units above, working
from the top prevents mortar from spilling on the units below.
Corner units should always be installed first.
 Evenly coat or “butter” the back of each stone veneer unit
with a ⅜-¾ in. (9.5-19 mm) mortar thickness and press
firmly into place with a twisting motion until the excess
materials extrudes from the sides of the unit. Use enough
mortar to achieve 95-100% coverage after placement.
 For larger units, apply a thick ring of mortar around the back
of each, leaving a small void in the center to create a vacuum
when pressing the stone in place.
 After pressing the stone into place, the distance from stone to
substrate should be approximately ⅜ in. ( 9.5 mm).
 Joints between units should be ½ in. (13 mm) or less.
 Once stone veneer units are in place, remove excess
extruded Heavy-Duty Stone Veneer Mortar from between units
to allow for application of ProSpec
®
Stone Veneer Joint Grout
(“Step 3” in ProSpec
®
Stone Veneer System). Do not allow
mortar to fill grout lines more than ¼ in. (6.3 mm), an even
space between units is desired for grouting and will help the
grout color to remain consistent.
 Veneer stones may be adjusted up to 10-15 minutes after
placing (at normal temperatures of 70°F (21°C).
 Work in areas of 5-10 sq. ft. (0.4-0.9 m2) to avoid allowing
mortar to dry or skim over before each unit is placed.
 Check mortar for complete coverage periodically by lifting a
veneer unit and inspecting the unit and substrate. Mortar
coverage for exterior and interior wet applications should be
95%-100%, interior dry areas 80% minimum.
 Shims, spacers, or wedges can be used to temporarily
support the units and maintain even spacing. They should be
removed once units are set and mortar is thumb print hard.
 Control joints can be installed to mitigate the effects of
support movement typically caused by seismic conditions,
change in weather, shrinkage and deflection per
specifications of project engineer, architect, designer, and
local building codes.
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Data Sheets are subject to change without notice. For the latest version, check our website at www.tccmaterials.com