![]() Trim the trough, making sure it’s about midway through the funnel. ![]() If possible, have a second person hold the trough, so it doesn’t slip.Slide the trough under the flashing on top of the ledger board.The smooth, shiny side of the trough should always face up.If installing 12″ on center, measure and cut 4″ on the side with a score mark.If using blocking, use blocking that is shorter than the joist height.You can also trim the funnel to fit a 2×6″ or 2×8″ joist. The funnel nozzle should extend at least 1″ into the gutter line and can be extended. Downspout funnels fit into a standard 5″ gutter below the deck.Make sure the cut side faces the deck bay. Cut downspout along the pre-scored marked guidelines.Downspouts are the perfect height for 2×10″ joist. Install downspouts for 12″ or 16″ joist spacing.Acclimating the trough is especially important in areas with wide temperature fluctuation. ![]()
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