replying to AL, rupigill wrote:
I think it very much depends upon how the posts were set. My wood post fence
is almost 20 years old... out of the 15 posts only one needed replacing 3-4
years back. I extended the fence about 7 years ago and again used PT posts...
fence is still solid. I think the key is NOT scrimping on the concrete and
the taking the time to dig a proper inverted-V hole that is a few inches
deeper than the post will sit; those few inches under the post bottom I
usually fill with concrete, and also make sure concrete top is higher than
ground level and slopes slightly upward towards post. Today I saw a
post-setting video on Home Depot website where the hole was dug with auger,
couple of inches of gravel put in, followed by the post and then the excavated
dirt was filled back in and tamped down... only at the top foot or less of the
hole was concrete poured in! How the hell is this post going to last!? (It
was redwood, not PT, post but I don't think that makes it okay.)
In addition to the proper hole digging and filling with concrete, I may be
lucky that I usually hit bedrock at about 20-inches so the last few inches are
chiseled into bedrock. Maybe that's the key ingredient :-)

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