Posted by jdemaris on November 07, 2010 at 07:52:33 from (72.171.0.143):
I just refreshed my memory, reading a huge study done by our USA Federal government, starting in 1909 and going up the the 1990s. It's amazing how much time and money went into studying fenceposts.
In brief- creosote treated southern yellow pine often lasted 50-60 years. CCA treated southern yellow pine 30-40 years.
Untreated natural woods?
This surprises me since when I first worked for building contractors in the 60s, Redwood was the #1 outdoor wood. According to tests though, it rots fast when in the ground.
Average life of natural fenceposts tested:
Black Locust - 37 years Rocky Mountain Juniper - 37 years Arizona Cypress - 25 years Osage Orange - 25 years Western Red Cedar - 21.3 years Arizona White Oak - 20 years Mulberry - 19 years American Chestnut - 19 years Green Ash - 18.7 years Mesquite - 18 years Northern White Cedar - 15 years White Oak - 10 years Honey Locust - 5 years Redwood - 3.6 years
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