Here in the Pacific Northwest, a multitude of homes were built with L-P innerseal siding as the cladding. Many people do not know it, but this product came not only in the lap siding that is so common, but also in 4ft x 8ft panels. As a home inspector, when I find oriented strand board (OSB), or the similar hardboard, I look at it very carefully. That is, especially so, the case when the house is from the mid-1980's to the mid-1990's.
Many real estate agents are more worried about whether or not the siding is L-P brand than they are worried about whether or not it is OSB or hardboard. In my view, the emphasis ought to be the other way around. All of the manufacturer's of these products, not just L-P, have had serious problems along the way. I, personally, am not a big fan of the "upgraded" wafer board and hardboard products that are still currently on the market.
However, since realtors often want to know if the house they are selling, or showing to clients, is the L-P innerseal siding that was subject to a lawsuit or not, here is a way to tell. The L-P innerseal products had a distinctive L and P that were placed in a signature knot.
Now, to make it more obvious, take a look at the highlights: Red L and Blue P.
L-P --- Now it all makes sense to you.
Steve this is where I 'see' an L pattern. I know it's not as deep as the one you marked but it's there and it's a better orientation to the P and the reader. Not that it matters. Once you recognize the knot you'll always see it.
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