Pressure treated lumber is wood, like pine or fir, that has been injected with a preservative in order to make it last longer on outdoor projects like fencing or decks.
When cutting thick pieces of wood, such as fence posts, the preservative may not have soaked all the way to the center of the lumber.
After cutting the piece to length, use a brush to coat the end grain with an additional dose of preservative to make sure it won’t rot.
Another approach that works even better is to stand the post up in a bucket of preservative and let it soak overnight.
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