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Composite doesn't scratch as easily as wood and will not dent like real wood does. The new versions look and perform better than the predecessors. It does get hot in full sun. I always frame joists12" on center for composite because in full sun it will sag a bit with 16" on center support. You could double up the joists on existing framing and the deck would stay flat and also feel super strong. And like Dad911 does, taping the tops of the joists will give you a deck that will last. You can also just staple 2" strips of 30lb. tar paper if you happen to have a roll. I built a redwood awning with 2x2 spaced 2" over a deck I built for my daughter and you can walk barefoot on it on a hot day but still let's plenty of light in. I used long 4x4 posts to support both the awning and the railing. I prefer the look of the redwood composite with some dark streaking best. It's looks real.
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