Trenwyth requires that you order 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 products. This panel
will represent the quality, color and texture of the product
and the workmanship to be expected for the project. Either
the owner or the project architect must approve the panel.
Failure to produce a sample panel may result in loss of warranty.
Trenwyth will provide 4" units for a 4' x 4' sample panel
at no cost for the material (not including freight to the
Delivery, Storage and
Verastone Plus masonry units shall be
delivered to the jobsite on covered banded pallets with cardboard
between the 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
Project Site Conditions
Protection of Work: Cover
walls, including open tops, 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
Do not, under any circumstance, install a damaged
unit that does not conform to the requirements of ASTM C90.
If units have been damaged during transit, contact Trenwyth
Laying Masonry Walls
Draw blocks from more than one pallet at a time during
installation. All exterior mortar shall include Trenwyth-approved
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.
adequate lighting for masonry work by placing all lighting
at a reasonable distance from the wall for even illumination.
Do not use trough lighting.
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
- Tool all mortar joints when thumbprint hard into a concave
- 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
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 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.
- Consult NCMA TEK Notes, available at www.trenwyth.com,
for proper installation of concrete masonry units.
- A complementary or matching mortar color is recommended
when using Verastone Plus units. Call 800-233-1924
and ask for Trenwyth's Sample Department to receive a Trenwyth
Mortar Kit (ID #TR0705).
- The Verastone Plus facing is not intended
for use as an impervious surface.
- Acid solutions/HCL acid-based cleaners should not be used
as a cleaning agent or come in direct contact with the facing.
- Verastone Plus facings should not be continuously
exposed to temperatures above 250º F.