In north america construction grade lumber is usually stamped s p f.
Construction grade fir wood.
Fir often called douglas fir.
Structural lumber including dimension lumber is visually and or mechanically msr graded for its strength and physical working properties appearance is secondary unless specified.
Douglas fir ponderosa pine white fir and western red cedar are the most common single species sold as dimension lumber products.
They tend to have a straighter grain making these woods suitable for use in construction framing lumber and building components such as windows and doors.
There are limits on most of the defects with the exception of some occurring only on the surface.
Cedar both red and yellow most commonly.
This means that each board could be some species of spruce pine or fir.
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Knots must be sound firm encased and tight.
Knots are allowed of any quality as long as they are well spaced.
The image to the left shows a typical grade stamp on the kind of framing lumber i buy for making fine furniture.
Select grade douglas fir.
If you want to see a more defined grade image please let us know.
Lumber of this grade is intended primarely for use in housing and light construction where it is exposed as paneling shelving and other uses where a knotty type of lumber with the finest appearance is required.
Lumber of this grade has strength and stiffness values that make it.
You can see that this wood could be spruce pine or fir.
Construction grade lumber is used for light framing.
All pictures are meant for a general grade description.
Some of the most commonly used softwoods that are created into lumber include.