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

After the forms are removed spray another 3/4 inch to both sides of the fence. After this has
cured a few hours finish the fence with a 1/4 inch thick coat of concrete with colorant added.
One can choose to finish with the gray concrete and stain it or just leave it gray. This final
coat can be etched to simulate rock, brick or block finish.
The fence is now structurally strong. It needs one more layer to even it up and then the
final layer of colorant.
to accumulate between the layers of
concrete.
Once all of the form work and
rebar are in place a light coating of
concrete is sprayed onto the form
through the rebar.
The placing of the concrete is
simple when done right. Apply the
concrete as evenly as possible at all
times. This helps in keeping the thickness
correct.
The shotcrete is started at the
bottom. The entire footing (top of
posts) should be covered first with a
thick layer that extends about 1 foot
up the wall. This is to make sure
that the concrete on the footing is
good concrete and not just shotcrete
rebound.
This first layer of concrete
includes the nylon fibers to make the
mix stick better. The idea is to cover
the plywood completely and to build
up some on the rebar.
It is not necessary that this first
run of concrete be very thick. If it is
working very well and sticking well,
then go ahead and put a 1/2 to 3/4 inch
on it. If all you can get to stick is a
1/4 of an inch, that is fine.
Let this concrete set over night,
or until there is approximately 600 psi
strength. This concrete will be tough,
but it still can be scratched with a key.
If the weather is inclement let the concrete
set for two days. If the concrete
is going to be subjected to severe rain
or frost it will need to be covered. If
it is real cold then it will need to be
heated between the covering and the
concrete surface.
The next day spray the fence
again with concrete, bringing the total
thickness up to about an inch and a
half. This may take two spray sessions.
Often it can be sprayed twice
the second day.
Build the fence out, embedding
the rebar very thoroughly. Care
should be taken to scrape the rebar
after each spraying of the concrete so
it does not have a large build up on it.
The rebar needs to be embedded
in the concrete with about a 1/2 to 3/4
inch of cover. The spraying process
the second day doesn’t need to get it
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