Wood grain tells a lot of things about the
wood itself. Reading how the wood grew is an important skill woodworkers try to
learn.
Lumber like cedar can be cut in one of three
ways: along the grain, across the grain, or at an angle of 45 degrees. Cutting
across the grain—called edge grain—is considered to be the most durable of the
three cuts of wood. You can see shakes cut perpendicular to the grain by
looking for the tight, straight pattern. The tight structure helps keep the
grain more stable during changes in moisture content.
For shakes and shingles, edge grain signifies
topnotch quality. A pack of premium grade shakes must all be edge grain pieces,
while Grade #1 shakes can have a maximum of 20 percent flat grain shakes.
Flat grain means the lumber was cut along the grain. These shakes are more
prone to splitting since external force can be applied along the grain.
Flat grain shakes have a heartwood pattern
that usually marks the center line for the shake. Getting a mix of edge and
flat grain shakes is more affordable than pure edge grain. However, if you're
anything but concerned about the cost, go for the premium grade.
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