Others have already mentioned T1-11, but I figured I'd add this just in
case what you are asking about is not really plywood.
About 1/2 inch thick, grooves and rough surface...could be an engineered
product, one example of which is Smartside:
It comes in planks, panels and trim and is typically made of wood strands
impregnated with anti-fungal and anti-insect additives.
Smartside is just one brand name, there are others. I have a shed sided and
trimmed with the product. Just this morning I watched an episode of How's
It Made where they showed the manufacturing process of the product.
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