I notice that I am 6 days late with this answer, but thought it good to let you know a little about this product. It is true that this is LP Smartside, a product that I have used for several years on my garden sheds with no negative results. The test will come with the years, though. It is a chipwood of the type OSB (Oriented Strand Board) so there is a direction to the wood fibers in the sheet. These means, of course, that it is stronger in one direction. It has a shiplap rather than a tongue and groove. The panels are meant to be installed vertically as DaveR said. In this case, the sheets are long enough to reach from the floor system all the way to the top plate, so there is no strength issue. At the expense of sounding like a salesman, I will say that this product has been treated (as have other LP products) and is very resistant to moisture. It has a 5 year full and 50 year pro rated warranty as far as delamination/product integrity is concerned.
Thank you again. It seems like half of a good program is a good source of help for the program. I see that this forum promises many good things.