I was advised by a former Sr. Executive in the home construction business in the area that the paint used by TV is good quality Sherwin Williams paint. He advised power. Washing every 1-2 years depending upon how much sun vs shade.
He then suggested 7-9 years after construction, then 8-10 years. That is to provide a good base for the future. After the second painting the paint should last 10-15 years with frequent (every 1-2 years) power washing.
I hope this helps!
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