what about a layer of cloth dipped in slurry then a layer of some kind of net and slurry
with a top 'render' layer of papercrete-use screen under to let the water drain and a wooden framework
to determine the size- you could try little test pieces to get the right thickness and rigidity.
i have had good results from cloth dipped in portland slurry fortified with bondcrete put
onto ringlock fencing tensioned between posts. i found that thinner natural fibre cloth worked best.
Poly cotton sheeting and synthetics were not good but cotton flannelette or old t-shirts worked well.
I tried burlap but it was expensive as i had to source it new and i didn't like it anyway. The cloth can
weave throo the fencing as strips (awkward) or easier, smaller pieces can be laid laid over
the horizontal wires like overlapping shingles. Once it is set, it leaves a good keyed surface to render over.
You can also make shapes with the wire to do sculptural work but Concievably you could adapt the
idea to make panels?
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