There were proprietary "plaster slabs" in the 1930's. 2 - 3 inches thick, plaster sometimes with sawdust mixed in and reeds laid horizontally as reinforcement. Unfortunately my book does not give any trade names but suggests there were several manufacturers of these types of boards. The illustration shows them as planks 12" high and 3' to 6 ' long.
I should think a few people have learned something new there. I suppose the question now is should it just be left as it is or replaced with a plasterboard and softwood studding partition.
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