patio cover construction

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I'm building a patio cover to turn my sun-baked deck into a year-round hangout spot. I'm framing it with pressure-treated lumber and topping it with corrugated polycarbonate panels to let in light while blocking UV rays. It's a 12x20-foot structure, with 6x6 posts set in concrete footings and a slight pitch for rain runoff. The tricky part is aligning the ledger board with the house's roofline to avoid water pooling. Once it's finished, I'll have a shaded area for grilling and outdoor dining, e…