Cambridge Pyzique Retaining and Freestanding Walls
Installation Guidelines: Cambridge
Pyzique® Wall Systems
Excavate a trench approximately 14 inches wide. Refer
to chart below for trench depth.
Compact bottom until fairly level. If you are building on unlevel areas
you can prepare step-downs in increments of the 4" thickness of the
Pyzique stone. Add 1" of coarse C-33 sand into the bottom of the
The First Course
Place the first layer of Pyzique stones smooth side
down on the prepared foundation. Use a carpenter's level in all
directions and use a string line to verify straightness. Serpentine walls
may be built too. Be certain
the base course is level and stones lay flat. For micro leveling and to
help the stones lay flat, keep a bag of sand handy and use small handfuls
to level and stabilize the first course.
Set the center side alignment groove directly above
the backmost 5/8" set
back groove of the stones in the next lower layer. This visual alignment
is all that is required for each successive layer of stones. To prevent
any granular fill or soil from passing through the system, a landscaping
fabric can be placed behind the wall units. A flexible drain tube is a
competent way to assure drainage from behind your wall. As successive layers
are set, stagger the face seams of the stones for interlocking wall strength.
The normal bottom of each Pyzique stone is smooth. Place the bottom
up for your cap row. To avoid vandalism, you may want to use a paver
glue to secure the cap layer to the layer below it. Place a dab of glue
on each of the stones that the cap layer's stone will set on. Stones
must be clean and dry for adhesive to bond.
Making A Square Corner
Pyzique can make square corners by splitting one
stone from front to back through the middle. Use paver adhesive at each "X" (see
illustration). Alternate Row "A" with Row "B" allowing
for setback in both directions.
Note: Retaining walls
are not built straight
up unless expensive geogrid materials and structural deadmen are utilized.
Walls must have a horizontal
force equal to or greater than the horizontal force of the soil being retained,
otherwise the wall will fail. Pyzique is designed with a 5/8" set
back for each row (5/8" horizontal tilt per 4" of wall height)
to impose a horizontal force against the retained soil.
Simply place a stone chisel in the corner tri-face groove
of the face that will be exposed. One hit with the hammer on the chisel
create the tri-face option.
Free Standing Stone Fences, Patio Barriers & Sitting
Pyzique's patented double split face allows you to build stone
fences, patio barriers and sitting walls with both sides showing a beautiful
These projects are built straight up using the zero set back groove.
Footings must be highly compacted aggregate or solid reinforced concrete.
of paver adhesive between the upper layers is necessary. Stone fences
must be built plumb.
Use construction techniques on these projects similar
to those used building a retaining wall. Start your project with at
least one layer
below the grade. Drain water away from the footing using a drain
tile similar to retaining walls. Be certain that stones are level in
directions. Stagger seams of Pyzique stones in these projects and
glue the top 2
3 layers together for barrier or fence integrity.
or stone fences will have greater strength than straight walls. Pyzique
stones may need to be cut with a paver chopper
wet saw to achieve specific radii.
For detailed installation instructions
on Pyzique Tiered Retaining Walls, Tree Rings, Steps, Lawn, Garden
and Paver Borders, visit
Your Authorized Cambridge Distributor.