We have a deck with a screened in porch beneath it. Currently we have PVC decking material which has warped badly. You can see where each deck joist is located as the decking slopes down in between them. This catches and holds a lot of water and dirt and looks terrible. The deck is on the south side of our house and gets almost constant sun exposure. I would like to replace the boards, but don't know what the best material would be for this situation. We live in Minnesota, so it must also handle cold. I want something that won't warp or get overly hot. Thank you!