IMPORTANT! Before You Begin
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 Handling
Split-face masonry units shall be delivered to the jobsite
on covered banded pallets with cardboard between the layers.
Keep protective block covers on the blocks until installation.
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 surface.
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 immediately.
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
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
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
- 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 RAKED 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 additional flashing information.
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.
Consult NCMA TEK Notes, available at www.trenwyth.com,
for proper installation of concrete masonry units.
- 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
- Split-face facings should not be continuously exposed
to temperatures above 250ºF.