|
SPECIFICATIONS – Printable Version
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. The provisions
of ASTM C90 Paragraph 8.2.1 apply with regard to imperfections.
Fire Resistance: Define hourly
ratings required as 1, 2, 3 or 4 hours.
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.
DELIVERY, STORAGE AND HANDLING
SPLIT-FACE 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.
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 sample panel 4' by
4' at no cost for the material (not including freight to site).
Part 2—Products
PRODUCT NAME
SPLIT-FACE masonry units.
MANUFACTURER
Trenwyth Industries, (800) 233-1924
One Connelly Road, P.O. Box 438
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 as available
at TRENWYTH INDUSTRIES. Refer to Division 4 Masonry Section
for mortar type and specifications. Use W.R. Grace DRY-BLOCK®
water-repellent mortar additive, available at TRENWYTH INDUSTRIES,
following manufacturer's instructions, in all exterior mortar.
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 masonry cleaners such as Sure Klean® Burnished
Custom Masonry Cleaner (dilute one part to 15 parts clean
water), following manufacturer’s instructions. Do not
apply Sure Klean with pressure spray above 50 psi.
CAUTION! Never
use Muriatic Acid solution 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 W.R. Grace
DRY-BLOCK® 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 3-1A for
Hot and Cold weather construction practices.
Lay units using the best concrete masonry practices. Install
only quality units; reject all defective units. 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 (32"
O.C. and 2" long, above bed joints, typical) at courses
above grade, above flashing, and at any water stops over windows,
doors and beams.
INSPECTION
The textured faces shall be free from chips, cracks, crazes
or any other imperfection that would detract from the overall
appearance of the finished wall 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 a detergent masonry
cleaner strictly following the manufacturer's instructions
including thorough rinsing. Do not use acid or abrasives on
the finished surfaces. For stubborn mortar stains or smears,
a 3:1 solution of Sure Klean® Burnished Custom Masonry
Cleaner by PROSOCO may be used as long as the walls are thoroughly
wetted before applying the cleaning solution and thoroughly
rinsed with clean water immediately after washing. Failure
to strictly follow manufacturer's instruction can result in
permanent damage to the finished faces. Do Not Power Wash.
High-pressure power washing is not recommended and may interfere
with the performance of the DRY-BLOCK® additives and cause
efflorescence
MAINTENANCE
SPLIT-FACE units, properly installed and cleaned, need
virtually no maintenance other than routine cleaning with
standard commercial grade cleaning agents such as PINESOL®
or Fantastik®. Graffiti, paint or dye stains may need
special cleaning methods and products such as Trenwyth's Graffiti
Wizard® environmentally friendly cleaner. Contact manufacturer
for specific cleaning recommendations.
Installation Recommendations
- Cavity wall construction is recommended for exterior walls,
with proper flashing, venting and weep holes.
- For best appearance, use stack bond construction when
stack bond appearance is desired (as opposed to scored units
in running bond).
- A complementary or matching mortar color is recommended
when using SPLIT-FACE units.
LIMITATIONS
- The facing is not intended for use as an impervious surface.
- Acid solutions should not be used as a cleaning agent or
in direct contact with the facing.
|
