Flower Mound, TX, US
Oh, one final point. If you do the rain screen as suggested and ensure bottom drainage, you won't need to use pressure treated lumber. This is an advantage since so much PTL these days has excessive moisture content at the time of sale (in big box stores at least). Douglas fir 4x4 works great and can expected to last a long time in this particular application. It is not different from furring strips behind siding, whereby testing has shown that pressure-treated furring is not needed if you have proper drainage behind the siding.
The title of this post is wrong and doesn't match the accurate sub-title. There is nothing discussed about "bomb proofing" a post. Nothing in the article discusses post-to-structure attachment techniques to protect from a bomb blast or high winds, etc.
I want to 2nd user-6554618's point and add: make sure there is an escape route at the bottom of the post -- that is, never "seal" whatever trim is at the bottom to the surface, or if you do, at least create weep holes.
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