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. Before installing trough material, acclimate it by unrolling and folding a soft crease down the center of the material or unrolling it flat on the ground.The following are installation steps outlined in this video: Double or single picture frame or divider board?.The following information will help you determine the right way to install your new under-deck drainage system: What Questions Should I Answer Before Installation? What tools are needed?Īs you prepare for installation, make sure you have these tools on hand:Ī midspan nail on the joists’ underside is also helpful to keep them straight. Trex RainEscape covers all the bases! Check out the low cost of this by using the materials estimator. Choose one that is high quality, guaranteed, and easy to install. But which one to choose?Ĭheck out this chart for comparison. Of course, you now know you should get an over-joist system. Not only does an above-joists system provide 100% protection of all the joists and beams from moisture penetration, but it also helps to hold the screws in place longer. Thus, when planning a deck, settle for nothing less than an above the joists system. In the heat of summer, wet wood cooks and rots. ![]() Even an 8-year-old deck needs to be replaced when this happens. With no air coming in to dry out the wood, the wood rots faster.
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