It is the second weakest grade in this scale: C14, C16, C18, С22, С24, С27, С30, С35 and С40.
C8 stress
You might be referring to 'pressure treated' lumber, or lumber that has been milled but not dry.
PT lumber is regular wood with a chemical preservative which has been forced to penetrate the wood using pressure.
Arsenic treated lumber is not being sold, but other pressure treated wood will be safe to use for your raised beds. Composite lumber and cedar lumber will both be safe and will last a long time for raised beds.
yes it can
C16 timber is sawn softwood structural timber which has been treated and strength graded
Treated lumber should be used in outdoor construction. There are different types of treated lumber, some are for above ground use and some are for below grade use.
16
concrete and cement
Yes. You will have to work around the ink stampings and knots, but the wood will take a stain.
15 .4 hope this has helped
There are a couple things that "graders" look for in a piece of lumber. One is the knot holes, if they are large this effects the grade. The other is bark no one wants a board that is all bark. So when you are looking for a strong piece of lumber you want one that has knot holes smaller than a half dollar coin and not all barked up the only bad effect that the bark has is it makes it hard to nail to.
premium select has less knotts, #2 construction grade.
C8 stress
C16 h19 n3 o5 s
Yes. Lumber.
when you have the lumber shed it will not show the lumber but in fact it DOES go into the lumber shed to get the lumber out press on the shed I HOPE I HAVE HELPED YOU