Mauwehu wrote:
There’s always someone at the hardware store that can give you great advice not so at Home Depot. Did you know that the “green” pressure treated lumber is ground contact at H Depot but not at Lowe’s. I learned the hard way.
As a retired carpenter/woodworker, I can assure you that NO WOOD, regardless of treatment, is truly "ground-contact-worthy". "Pressure-treated wood" (green, orange, dark brown...matters not) is only "rot-resistant" to a depth of MAYBE(?) 1/2"....on SIDE GRAIN, NOT ENDS...ever. And any end cut renders "pressure treated lumber" void on any protection whatsoever. Take a look at the penetration depth (grain stain) on that end cut...kinda scanty.
The only way wood can possibly withstand direct ground contact is by TOTAL sealing of the end grain.The sealing can be done with a variety of products, from EXTERIOR GRADE latex or oil paint, some type of plastic or rubber sealant (again...exterior grade), or best, but crude and likely marginally effective....tar paper or non-porous rubber matting. Best to have, concrete brick/block to simply PREVENT GROUND MOISTURE FROM EVER HAVING LONG-TERM direct contact.
Wood is a bundle of tiny, very long "straws", it's how the tree moves moisture and nutrients to its structure.
"Close" those "straws ends" and moisture migration ("wicking") is mitigated severely.....but remember...never 100% using any method.
As an aside....my Father used to keep a "soaking stack", made of a closed end 4' long piece of 8" plastic pipe. Every 4x6, 4x4, 2x4, 2x2, that was cut and to be used outdoors, was subjected to some soak time in the 4' tube (even if it was to eventually be painted)....filled with Pentachlorathane, the highly effective rot-resistance wood treatment of yesteryear....and declared a " highly carcinogenic product" and taken off the market in the early '70s by government mandate. My Father's extremely foolish response (chastised by both me and my older brother, the PhD biochemist/ M.D.) was to go buy ALL of the remaining stock of "penta" that the lumberyard and hardware store in his small town had.
Scoffed at the "danger" my brother and I (and the government scientists !) warned him of....and continued his practice. He had previously shown the same disregard and actions in the '60s, regarding DDT....saying "But Son...it works so very well".
Sad epilogue......Dad died of CANCER in 1999. Most likely from such disregard of so many product warnings from a variety of practices, including cutting asbestos board with a skilsaw...no mask....jeeesh.
Be safe out there folks, pay attention to safety warnings, please.