I have had two previous houses where rain falling from the roof bounced off the deck and splashed up under the clap boards well above the flashing. This caused rotting to the extent that the walls had to be replaced.
Several years ago I saw a neighbors house where they had installed grating in place of a row or two of deck boards to allow the rain falling from the roof to largely pass through the deck without splashing. I have used the technique on a deck I built and it makes a big difference on how much water splashes up. The aluminum grating is the same thickness as the Trex.
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