Yea, the small portion that is besides our maple tree gets a bit of "moss". I think it makes it look rustic. I If the wife doesn't like it, I power wash with a fan blade. I did that 4 yrs ago. The rest 7/8ths is fine. Plenty of sunshine. Looks like new.
I didn't use a "system". I used them like boards and screwed them in with a nail space in between. It has been up for 15 yrs. I nailed up under neath the tin metal sheets of roofing colored white. So under the deck is dry. I love sitting out under the deck with thunder storms.
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