In article ,
Retiredff wrote:


AutoTracer wrote:

Thing I don't like about pressure treated (especially 2x4 and 4x4) is
the little grooves cut in the surface to identify it as PT. this
kind of ruins it for exposed work since you shouldn't sand this wood
extensively.

I have never seen any pressure treated lumber with grooves or any other
identifying marks cut into the wood.

Are you sure you aren't talking about the shallow scalloping that occurs,
from the planer blades, when rough lumber is sent through a planer too fast?



The grooves are not to identify the wood as PT per se, but are cut
into some species of wood to allow the treatment to penetrate
sufficently. Southern yellow pine is very common for PT lumber because
it is one of the species that does NOT require this "incising" or
"slitting" to accept the pressure treatment.


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Larry Wasserman Baltimore, Maryland