Quote:
Originally Posted by gregpark
Todays PT does not rot easily as long as there's no earth to wood contact. It's not as good as it was back in the day when it was super dark green. They advertized to last 40 years buried in a tropical jungle. It was deemed too carcinogenic and I'm sure they were right. Cheap redwood from a big box store is not worth using in my opinion. Cut from 8 year old farmed trees and not much better outdoors than fir or pine. The "white" grain you refer to is called sap wood and rots faster than interior soft woods. You can still get old growth, real deal redwood but you'll pay dearly for it. For framing outdoors I go with PT and dont let it touch the ground or bury it in concrete
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The S4S redwood for decks & rails is much older growth to be sure, but if redwood has white, light streaks in it is less dense and more likely to take on moisture. Your post is painted and directly loaded so it out of the moist soil. A fence post in concrete might as well be direct buried in dirt because the moisture infiltrates. Go ahead and slope the post concrete so water does not collect and drain into it, you can still push it over in like 4 years.