These are examples of markings you could find on the back of various siding products. In some cases I have not found any markings on the siding of a complete home. The one below is obviously Masonite.

WEYERHAEUSER SIDING

Notice the AHA 10 and the tree in a triangle or something that looks like a big A.

TEMPLE-INLAND

This is a sample of Temple Inland siding from a David Weekley home in Houston, TX. notice the smooth, dark texture and the INLAND which is very noticable.

TEMPLE INDUSTRIES

This is a sample from panel siding. Notice the cluster of Ts connected together in circle.

OMNIWOOD

Notice the works "Masonite Omniwood" and then notice the pattern. 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.

LP INNER-SEAL

Same piece as above, but notice the APA and the LP Inner-Seal label.

ABITIBI-PRICE

This is a close up of Abitibi-Price. Notice the course pattern on the back.

SIDING PATTERNS

This is a close up of a Masonite product calledWoodsman lap siding. Notice the waffle iron pattern or burlap pattern. I have seen this on different types of Masonite. Notice the color also and texture.

X-90

Here is a sample of Masonite with the X-90 markings. Notice how the letters are made with a series of dots.

MORE X-90

Here is another sample of X-90 on Masonite brand siding

BOISE CASCADE

This is from a home built by Village Builders in the mid 80's with Boise Cascade 12" lap siding. Notice the circle around the tree.

BACKSIDE OF MASONITE
6" SMOOTH LAP

This is the 90 in X-90. Notice how the back is smooth. No waffle iron pattern like above.

CHAMPION STAMP

On the siding of plywood