How To Build A Spray-In-Place Concrete Fence - Monolithic

side that we are going to do the spraying
against. It needs to be the least
obstructed side.
The next step is to set the form
boards on the off side of the work
area.
Coat the form on the near side
with a concrete release agent. This
release agent is often called form oil.
Many times it is nothing more than
diesel fuel. Form oil can be purchased
at any concrete accessory supply
house.
Putting Up the Forms
After applying the form oil stand
up the single side forms.
Place the formwork so that it is
vertical and passes immediately adjacent
to the post tops, approximately
two to three inches off the center of
the post.
The fence must be perfectly
straight up and down (plumb) and it
should be square at the corners with
bracing of 2” x 4” and stakes to hold
it still. Brace the form well enough to
be able to withstand normal winds and
some abuse, but the concrete is not
going to add any significant pressure.
These photos are of the off side.
You can see the temporary wafer
board, braces, and stakes in place.
Options
This is an extremely simple
system. The pieces can be made in
modules to be moved in four foot or
eight foot sections.
If the fence length is short, you
probably need to form the entire
length of the fence.
If you are building a long fence,
form and spray part of the fence.
After the second spraying of concrete
you can generally move the forms
and start a new section while you are
finishing up old section.
Brace the form well enough to be able to withstand normal winds and some abuse (above).
The formed offset (below) gives two benefits — a decorative finish to the end of the fence
and extra strength to the straight wall.
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