C-F-Z Control Joints, Zinc Strips,
Threshold Trim Molding
Precision Epoxy Products
a division of :
Rock Art, Ltd.
4279 Midway Drive
Douglasville, Georgia 30134
Phone : (770) 489-0340
The Zinc Strip is a 16 gauge 'L' angle zinc
piece packaged in six foot lengths. Available in sizes of 3/16, 1/4, 3/8, 1/2,
5/8 and 3/4 inch heights with a 1/2 inch base leg of the 'L' being predrilled
for mounting. The Zinc Strip is used for finishing edges such as the outer
perimeters of a substrate surface to retain the Riverstone Decking and to protect
from chipping and/or fraying. Zinc Strips are also used as single strip
expansion joint retainers where cross flow drainage or minimal motion
characteristics are present. Zinc Strips are mechanically screw mounted to the
substrate and may be shimmed for drainage considerations. Zinc Strips are
easily fabricated for custom situations, mounting precision and can be mounted
on a radius. Proper use and
mounting of the Zinc Strip within a Riverstone Decking installation will
greatly enhance the structural and cosmetic values of your deck.
The C-F-Z Control Joint is
designed for maximum effectiveness in controlling substrate expansion joint
and cold joint movement with regards to structural, cosmetic and waterproofing
values. The C-F-Z (Constructed Flexible Zinc) Joint is used for retaining and
representing the expansion joints in the substrate within the Epoxy Riverstone
overlay whether they be existing or added saw cut joints. Expansion joints,
most cold joints and some stress fractures within the substrate have some
degree of expansion and contraction characteristics due to thermal movement.
If the Riverstone Decking is installed over these areas, then cracking of the
overlay will eventually occur. This situation will be eliminated with proper
use and placement of the C-F-Z Control Joint as apart of the Riverstone
Decking installation.
The C-F-Z Control Joint is also
used to finish the Riverstone overlay at the substrate perimeter adjoining
vertical surfaces such as walls, post, steps, doorway molding, fences, pool
coping, etc for
absorbing thermal movement and waterproofing. This is essential for adjoining
surfaces that are made of wood that can rot or metal that can rust. The
Riverstone Decking, being a porous overlay, tends to allow moisture to migrate
into or against these items below the surface of the overlay. When troweling
up against these type surfaces, this situation creates an accelerated rotting
of the wood and/or rusting of the metal which can go undetected until it is to
late and the damage is done. This problem can be completely eliminated with
proper use and placement of the C-F-Z Control Joint as apart of the Riverstone
Decking installation.
The C-F-Z Control Joint is
fabricated on site by mechanically screw mounting zinc strips along both sides
of an expansion joint at the edge of each slab section. The 1/2 to 3/4 inch
wide gap created between the zinc strips is filled with one of the flexible
gel epoxies or similar type flexible caulking material (see Technical Bulletin
on Flexible Gel Epoxy Series). When using the C-F-Z Joint adjoining vertical
surfaces, only a single zinc strip is mounted 1/2 to 3/4 inch off the surface
and the flexible membrane material is applied to fill the gap and tooled to a
smooth, waterproof control joint. Should substrate settling or roughness hinder
or prohibit even mounting of the zinc strips, then a layer of Santex (see
Technical Bulletin on Santex System for more
information) can be applied first to allow for uniform
zinc mounting. The C-F-Z Control Joint is far superior to using wood or PVC
type expansion joint material because it waterproofs the substrate expansion
joint or cold joint, it will not dry out or rot out, is maintenance free and
maintains it's functional and cosmetic value.
Threshold Trim Molding
is a 1/2 inch tall, quarter round, aluminum floor molding with a 2 inch
mounting base designed for finishing the Epoxy Riverstone overlay at adjoining
doorway thresholds or other type adjoining surfaces. The Threshold Trim
Molding creates an easy transition between two even surfaces when one side has
the Riverstone overlay and the other side does not. The Threshold Trim Molding
also protects the edge of the Riverstone overlay from chipping or fraying
while giving the overlay a functional and cosmetic finish. Trim Molding is
available in polished Chrome or Gold and comes in 6 or 8 foot lengths. Trim
Molding is mechanically screw mounted to the substrate. Trim Molding cannot be
mounted on a radius like the zinc strips.
Screw Mounting
for the Zinc Strip and Trim Molding is accomplished with the use of a 3/16
inch masonry bit and a hammer drill to create the mounting holes in the
concrete substrate. A 3/16 inch (size 6 - 8) plastic anchor is inserted into
the mounting holes and the piece is secured using special zinc and/or
stainless screws designed for this application. The mounting screw lengths are
determined by the application environment. Spacing of mounting screws for
standard application situations are as follows:
Zinc Strips
every 6 to 8 inches where
possible foot traffic is present or every 8 to 12 inches where no foot traffic
is expected. C-F-Z Control Joints
every 12 to 16 inches
allowing for additional support from being encased by structural materials on
either side of the zinc strip. Trim Molding
every 2 to 4 inches to allow
for the abuse of anticipated foot traffic.
Special situations will require closer mounting screw placement.
Mounted Zinc
strips have to be firm enough to not allow any flex when troweling the
Riverstone overlay up to them.
Mounting to wooden substrates can
be accomplished by screw mounting directly into the wood using the same
suggested spacing. It is very important however, to make sure the mounting
screws are waterproofed prior to the installation of the Riverstone Decking
overlay to keep moisture from penetrating the wooden substrate.
Zinc Strips, C-F-Z Control Joints and
Threshold Trim Molding all can be retro fitted into older decks that did not
received them as part of the original installation. See Riverstone Decking
Repairs for more information.
cross flow drainage or minimal motion
characteristics are present. Zinc Strips are mechanically screw mounted to the
substrate and may be shimmed for drainage considerations. Zinc Strips are
easily fabricated for custom situations, mounting precision and can be mounted
on a radius. Proper use and
mounting of the Zinc Strip within a Riverstone Decking installation will
greatly enhance the structural and cosmetic values of your deck.
The C-F-Z Control Joint is also
used to finish the Riverstone overlay at the substrate perimeter adjoining
vertical surfaces such as walls, post, steps, doorway molding, fences, pool
coping, etc for
absorbing thermal movement and waterproofing. This is essential for adjoining
surfaces that are made of wood that can rot or metal that can rust. The
Riverstone Decking, being a porous overlay, tends to allow moisture to migrate
into or against these items below the surface of the overlay. When troweling
up against these type surfaces, this situation creates an accelerated rotting
of the wood and/or rusting of the metal which can go undetected until it is to
late and the damage is done. This problem can be completely eliminated with
proper use and placement of the C-F-Z Control Joint as apart of the Riverstone
Decking installation.
The 1/2 to 3/4 inch
wide gap created between the zinc strips is filled with one of the flexible
gel epoxies or similar type flexible caulking material (see Technical Bulletin
on Flexible Gel Epoxy Series). When using the C-F-Z Joint adjoining vertical
surfaces, only a single zinc strip is mounted 1/2 to 3/4 inch off the surface
and the flexible membrane material is applied to fill the gap and tooled to a
smooth, waterproof control joint. Should substrate settling or roughness hinder
or prohibit even mounting of the zinc strips, then a layer of Santex (see
Technical Bulletin on 
Threshold Trim Molding
is a 1/2 inch tall, quarter round, aluminum floor molding with a 2 inch
mounting base designed for finishing the Epoxy Riverstone overlay at adjoining
doorway thresholds or other type adjoining surfaces. The Threshold Trim
Molding creates an easy transition between two even surfaces when one side has
the Riverstone overlay and the other side does not. The Threshold Trim Molding
also protects the edge of the Riverstone overlay from chipping or fraying
while giving the overlay a functional and cosmetic finish. Trim Molding is
available in polished Chrome or Gold and comes in 6 or 8 foot lengths. Trim
Molding is mechanically screw mounted to the substrate. Trim Molding cannot be
mounted on a radius like the zinc strips.
Screw Mounting
for the Zinc Strip and Trim Molding is accomplished with the use of a 3/16
inch masonry bit and a hammer drill to create the mounting holes in the
concrete substrate. A 3/16 inch (size 6 - 8) plastic anchor is inserted into
the mounting holes and the piece is secured using special zinc and/or
stainless screws designed for this application. The mounting screw lengths are
determined by the application environment. Spacing of mounting screws for
standard application situations are as follows:
