In some cases I have not found any markings on the siding of a complete home. The one to the left is obviously Masonite. This is a sample from panel siding. Notice the cluster of Ts connected together in circle. Wood chps glued together.
Small tooth pick pieces of wood chips.
LP Inner Seal Notice the pieces of siding glued to gether. Notice the wood chips are bigger thand the Omniwood siding. Same piece as above, but notice the APA and the LP Inner-Seal label. Notice the course pattern on the back. This is a close up of a Masonite product calledWoodsman lap siding.