When you do replace, instead of the standard 2x4's, use a product called SmartTrim. It's an LP product available at home depot or lowes. Comes pre-primed & you can pick it up in a 1"x4". Has a 50yr warranty against rotting/warping - same warranty as hardi-plank.
Thanks for the info! I was already thinking about getting something that was treated in some way, so I wouldn't be doing this every few years.
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