SPECIFICATIONS – Printable : PDF
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Part 1—General
SUBMITTAL
Submit color samples for selection from manufacturer’s
group A, B, C, D or E. Submit product literature, certifications,
test reports and full size sample(s) of each color specified.
QUALITY ASSURANCE
Certifications: Concrete
blocks for finishing shall conform to ASTM C90. All units
contain Trenwyth-approved integral water-repellent CMU admixture
at the time of manufacture.
Mold and moisture resistant, Mesastone units will last the
life of the building (never paint or refinish). No VOC’s.
Available in a wider color selection, custom colors and unique
shapes and sizes, Mesastone units are ideal for interior and
exterior applications. The structural integrity of the unit
results in a one-step, single trade installation process.
Mesastone units are distributed nationally.
Fire Resistance: Define
hourly ratings required by NCMA TEK Notes, available at www.trenwyth.com.
Field Constructed Mock-Ups: Construct a sample panel, no less than 4' x 4', of
units of each color and size to be used in the project.
Trenwyth requires ordering a full size unit
to illustrate color and texture for approval.
Trenwyth Industries requires a sample panel
be installed at the jobsite prior to installation of any Trenwyth
product. This panel will represent both the quality of the
product and the workmanship to be expected for the project.
The panel must be approved by either the owner or architect
for the project. Trenwyth will provide 4" units for a
4' by 4' sample panel at no cost for the material (not including
freight to site).
DELIVERY, STORAGE AND
HANDLING
Mesastone units shall be delivered to the jobsite on
covered banded pallets with cardboard between layers. Store
pallets in single stacks on level ground and cover with waterproof
covering (e.g., tarpaulins) to protect the blocks from inclement
weather. Handle blocks carefully to avoid breakage and damage
to the finished surfaces.
PROJECT/SITE CONDITIONS
Protection of Work: Cover
walls each day after installation to keep open walls protected
and dry. After units are installed they should be protected
from damage by other trades performing operations that can
stain or otherwise damage the finished surfaces by covering
walls with plastic. Corners should be protected from damage
after installation by covering them with plywood.
Part 2 – Products
PRODUCT NAME
Mesastone® textured concrete masonry units.
MANUFACTURER
Trenwyth Industries (800) 233-1924
One Connelly Road
Emigsville, PA 17318
Trenwyth Industries (800) 358-3003
3400 E. Bungalow Road
Morris, IL 60450
Trenwyth Industries (800) 331-9823
4626 N. 42nd Avenue
Phoenix, AZ 85019
RELATED MATERIALS
Colored matching or contrasting mortar is available
at Trenwyth Industries. Consult NCMA TEK Notes, available
at www.trenwyth.com, for mortar type and specifications.
In all exterior mortar, use matching Trenwyth-approved water-repellent
mortar additive, following manufacturer’s instructions.
Consult manufacturer for recommendations.
SIZES AND SHAPES
Nominal 2", 4", 6", 8", 10"
and 12" standard block thickness are available as well
as all standard block shapes. High-strength units for special
structural requirements, over-sized units, and metric shapes
and sizes are also available.
MASONRY CLEANERS
Use Burnished Custom Masonry Cleaner by PROSOCO (dilute
1 part to 3 parts clean water), carefully following manufacturer’s
instructions. Available at Trenwyth Industries. Do
not powerwash.
CAUTION! Never
use Muriatic Acid solution or any cleaner containing acid
on units.
Part 3 – Execution
LAYING MASONRY WALLS
Draw blocks from more than one pallet at a time during
installation. All exterior mortar shall include matching water-repellent
additive added to each batch in the appropriate dosage rates
for mortar type (M, S or N) per manufacturer’s instructions.
Refer to NCMA TEK Notes, available at www.trenwyth.com, for
Hot and Cold weather construction practices.
Lay units using the best concrete masonry practices.
Install only quality units; reject all defective units as
defined by ASTM C90. Lay blocks with the faces level, plumb
and
true to the line strung horizontally at the ground face. Units
shall have uniform, 3/8"-wide joints both horizontally
and vertically on the finished side of the wall. Tool joints
neatly after they are finger-hard to make them straight and
uniform. Size and place cut pieces appropriately to maintain
consistency and bond. Complete masonry construction using
procedures and workmanship consistent with the best masonry
practices.
INSTALLATION
Lighting: Provide adequate
lighting for masonry work by placing all lighting at a reasonable
distance from the wall for even illumination. Do not use trough
lighting.
Cutting: Make
all unit cuts, including those for bonding, holes, boxes,
etc., with motor-driven masonry saws, using either an abrasive
or diamond blade. Cut neatly and locate for best appearance.
MORTAR BEDDING AND JOINTING:
- Lay units with full mortar coverage on head and bed joints
taking care not to block cores to be grouted or filled with
masonry insulation.
- Tool all mortar joints when thumbprint hard into a concave
configuration.
- Care should be taken to remove mortar from the face of
masonry units before it sets.
- Tuckpoint the joints of scored units for proper appearance.
All exterior scored units must be tuckpointed to prevent
water penetration. NO RAKE JOINTS.
FLASHING OF MASONRY WORK
Install flashing at locations shown in the plans and
in strict accordance with the details and the best masonry
flashing practices.
WEEP HOLES AND VENTS
Install weep holes and vents at proper intervals at
courses above grade and at any water stops over windows, doors
and beams. Consult NCMA TEK Notes, available at www.trenwyth.com,
for additional flashing information.
INSPECTION
The textured faces shall conform to the requirements
of ASTM C90 when viewed from a distance of twenty (20) feet
at right angles to the wall with normal lighting.
CLEANING
Keep walls clean daily during installation using brushes.
Do not allow excess mortar lumps or smears to harden on the
finished surfaces. Harsh cleaning methods after walls have
been erected may mar the surface of the blocks.
FINAL CLEANDOWN
Clean the completed walls with PROSOCO Burnished Custom
Masonry Cleaner (dilute 1 part to 3 parts clean water), strictly
following the manufacturer’s instructions — including
thorough rinsing. Do not use acid or abrasives on the finished
surfaces. Failure to strictly follow manufacturer’s
instructions can result in permanent damage to the finished
faces. Do not powerwash.
High-pressure power washing may interfere with
the performance of the integral water-repellent additives
and cause efflorescence. (Maximum psi is 50)
MAINTENANCE
Mesastone units, properly installed and cleaned, need
virtually no maintenance other than routine cleaning. For
tough stains, contact manufacturer for specific
cleaning recommendations.
INSTALLATION RECOMMENDATIONS
Consult NCMA TEK Notes, available at www.trenwyth.com,
for proper installation of concrete masonry units.
LIMITATIONS
- The facing is not intended for use as an impervious surface.
- Acid solutions and HCL acid-based cleaners should not
be used as a cleaning agent or in direct contact with the
facing.
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