For the specifications of an
individual product line, please select the product below:
| Grey Block
– Printable : PDF
Version – Word
Part 1 - General
Submit product literature, certifications, test reports and
full size sample(s).
All sound-absorbing masonry units shall be Acousta-Wal
units produced with special mold parts available from Trenwyth
Industries. Units shall be manufactured to meet ASTM C90.
Production shall be monitored so that the top of the units
shall be completely closed and edges of slots and ends of
blocks shall be straight and clean. Type IV units shall have
fillers as supplied by Trenwyth Industries, inserted in the
cavities at the block plant. Type IV fillers shall be fiberglass
fillers laminated to metal septa. All filler material shall
be cut accurately to size and installed as recommended for
the type of Acousta-Wal units specified. All units contain
Trenwyth-approved integral water repellent CMU admixture at
the time of manufacture.
Fire Resistance: Define
hourly ratings 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 that a jobsite sample panel be installed at the jobsite
prior to installation of any Trenwyth products. 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
Acousta-Wal 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.
Protection of Work: Cover
walls each day after installation to keep open walls protected
Part 2 – Products
Grey Block / Acousta-Wal® concrete masonry units
Trenwyth Industries (800) 233-1924
One Connelly Road
Emigsville, PA 17318
Trenwyth Industries (800) 358-3003
3400 East Bungalow Road
Morris, IL 60450
Trenwyth Industries (800) 331-9823
4626 N. 42nd Avenue
Phoenix, AZ 85019
Colored matching or contrasting mortar is available
at Trenwyth Industries. Consult NCMA TEK Notes, available
at www.trenwyth.com, for mortar type and specifications. For
all exterior mortar, use matching Trenwyth-approved water
repellent mortar additive, following manufacturer’s
instructions. Consult manufacturer for recommendations.
SIZES AND SHAPES
Acousta-Wal units surfaces are manufactured to provide finished dimensions of 7-5/8" x 15-5/8" ± 1/8". Bed depth dimensions for single face units are 3-9/16", 5-9/16", 7-9/16", 11-9/16" ± 1/8". Two face units are 3-1/2", 5-1/2", 7-1/2", 11-1/2" ± 1/8". Please contact the plant for size availability.
Part 3 – Execution
LAYING MASONRY WALLS
Draw blocks from more than one pallet at a time during
installation. All exterior mortar shall include a Trenwyth-approved
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.
Acousta-Wal units shall be installed by the
general contractor or masonry contractor. Installation of
Acousta-Wal blocks shall be consistent with the best concrete
masonry practices. Only quality units shall be used.
Acousta-Wal blocks shall be laid in running
bond or stack bond as specified with the closed tops
up. They shall be laid in a full horizontal bed of
mortar. The slots shall face toward the room or area where
sound absorption is required as shown on the plans. Slots
shall be kept free of mortar and debris and the exposed mortar
at the bottom of each slot shall be neatly tooled. NO
Lighting: Provide adequate
lighting for masonry work by placing lighting at a reasonable
distance from the wall for even illumination. Do not use trough
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
In all exterior mortar, we recommend using an approved
water repellent additive (which may be purchased from Trenwyth
Industries), following manufacturer’s instructions.
Consult manufacturer for recommendations.
FLASHING OF MASONRY WORK
Install flashing at locations shown in the plans and
in strict accordance with the details and the best masonry
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 proper flashing and drawings.
The ground face and filled and polished faces shall
conform to the requirements of ASTM C90 when viewed from a
distance of 20 feet at right angles to the wall with normal
units must be laid in a full horizontal bed of mortar and
laid with the closed tops up. The slots should
face toward the noise source. Slots must be kept free of mortar.
The exposed mortar at the bottom of each slot should be neatly
tooled and all debris removed. NO RAKE JOINTS.
Under no circumstances should the units be laid
upside down; that is, with the closed tops down. First, it
would be impossible to lay the units in a full horizontal
bed of mortar if they are laid upside down. Second, excess
mortar would fall into the slots giving an unsightly appearance.
If the cavity volume were reduced by more than 5 to 10% due
to mortar falling inside, the acoustical performance of the
units would be altered.
All Trenwyth concrete masonry units are manufactured
with an integral water repellent. The admixture is mixed through
the block at time of manufacture and lasts for the life of
the product. Mortar must also be treated at the time of installation.