I soon will have a new band sawmill with which to cut some eastern white pine, only some of which will likely yield high quality boards. My questions are: is the poorer quality knotty pine strong enough to use as construction lumber, e.g., as 2x4, 2x6's, etc.; and if rough sawn, air dried pine is used as siding, will pitch be a problem if semi-transparent stain is applied?
(Sawing and Drying Forum)
From contributor P:
What you describe as low quality and knotty is whatís available at the lumberyard. Each piece of lumber has to be looked at for quality when building with it, even the store bought stuff. Sawyers who use their own lumber get more knowledge of what works. Spike knots steal more strength than round knots do. You will probably find out like I did, you get a lot of unusable and some good.
Regarding the use for construction lumber, such as for a home, the knotty material may be strong enough, but most structures that are used for human occupation will require graded lumber. The grades require special knowledge and application of this knowledge to assure that the knots that are present do not weaken the piece too much. Very few states allow you to cut your own lumber and use it for construction of a home or other building without having the wood graded.