It isn't timing from the mill.
If you go through six or seven lifts of material, some of it is going to be sub-par.
The yards/Big Boxes normally would cull this. But if that is all they have, and the sales person doesn't make a note, the load builders will generally just send what they have.
The more wood that a yard goes through, the quicker this material builds up... and without being culled... the sales person doesn't realize that is what is left when they enter it, because the computer just shows the amount, not the quality.
The grades only matter as to how much cull you may build.
HD/Lowes tend to buy #2 or Better Eastern in our area. While the smaller yards tend to buy #1. The #2 or Better will have many #1 in the lift, but not all.
You also have Western as a higher cost option sold by some yards. Western tends to be a better quality in any grade compared to Eastern.
But for PT, which is from SYP (Southern Yellow Pine), that is all just by grade. The lumber yards tend to carry #1, while the Big Boxes carry #2.
The quick cycle of harvesting shouldn't change the certified grading. But it does mean that more of the lower grade will end up in each lift.
So the timing is more about when new lifts come in, and whether the load builder is paying attention.
Years ago, I was trained not to put into a delivery something that I would not buy for myself. I would have to make a note to the sales person to contact the customer and let them make the decision.
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