Remember the ferro-cement roof trial we did on my back porch? We made some adjustments (learned from our mistakes) and are now doing the roof for the high school's WC in the new and improved way. We save on iron and cement and the roof will last a lot longer than a metal one. It is only one and a quarter inches thick whereas a normal poured cement roof is about six inches.
Trial & error is the tried & true way people have made strides through out history. Congratulations on your perseverance & innovation.
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