To find the markings:

• Pull a board off the house and look at the back. Look for markings and notice the color and texture.
• Go to an unfinished part of the house like in a garage or attic. Pull back the protective tar paper and look for markings.
• Look for samples left in the attice or in the rafters of the garage.
• Besides finding the manufacturer's markings on the back (see pictures below) or identifying the pattern, you can also match the American Hardboard Association codes stamped on the boards. Look for the AHA markings and use the following tables to help you.

See below for more pictures.

	Masonite 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 to the left 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 Thisis 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.