I've looked for a definition on the web and it seems that T1-11 is hardboard. But I've also seen it called plywood. Which is it?
I thought they were very different. Plywood is iiuc 3 or more layers of wood, where each layer comes from putting a log on a big lathe and taking off a continuous strip of wood, each layer deeper into the log for every rotation of the lathe. That's why one sees a repetitive pattern on plywood, because if that part of the tree is 16 inches in circumference, every 16 inches one sees a different level of the same branches, etc.
Hardboard otoh in wikipedia is described "Hardboard, also called high-density fiberboard, is a type of fiberboard, which is an engineered wood product. It is similar to particleboard and medium-density fiberboard, but is denser and much stronger and harder because it is made out of exploded wood fibers that have been highly compressed. Consequently, the density of hardboard is 31 lbs. or more per cubic foot[1] and is usually about 50-65 lbs. per cubic foot. It differs from particle board in that the bonding of the wood fibers requires no additional materials,[2] although resin is often added. Unlike particleboard, it will not split or crack. It is used in construction and furniture."
I think T1-11 is heavier than plywood of the same thickness. It seems to be hardboard. Right?
Thanks.