Also, consider a MARINE grade or equal varnish of final finish. Back up North, I had an all wood 16 foot garage door as well as front door, facing due west. I found that using MARINE grade finishes lasted almost twice as long as conventional finishes. I always did these myself, but I would check with the above contractor to see what they recommend for long life.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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