Concealed Deck Drainage Systems

Dek Drain Topside  Designed for new construction, Dek Drain Topside attaches to the top of joists before the deck boards are fastened down. The system’s flashing, panels, and cap strips tuck into the bays of the deck, creating a concealed drainage system that keeps the deck frame dry, says the company. Any ceiling materials, finishes, or fixtures can be safely installed beneath the Topside system. 

CertainTeed UnderShield This water-diversion system is simple to install for new or existing decks, according to the company, and is designed to keep below-deck spaces dry. Vinyl panels—each measuring 16 feet long by 6 inches wide—attach to a concealed grid, which in turn is attached to the deck framing. The panels use a concealed clip system and are available in chamfer or beaded styles. Stainless steel hardware is included. 

Zip-UP UnderDeck Made from interlocking PVC components, Zip-UP UnderDeck installs between the joists to create a watertight barrier that routes water away from the space beneath a raised deck. The system meets every Florida standard for static and cyclic load tests of hurricane strength wind, says the firm. Available in three finishes, the product provides a grid-free, non-corrugated ceiling surface that is resistant to mold and mildew. 

TimberTech DrySpace DrySpace secures between the deck joists to route water away from the space beneath. The system forms a ceiling made from off-white solid extruded vinyl, which the firm says lightens the area below. Designed for new or existing second-story decks with 12-inch or 16-inch on-center joist spacing, TimberTech also offers an optional gutter and downspout to ensure water is drained away from the usable space beneath. 

Trex RainEscape Made with rugged plastic and ultraviolet inhibitors, the RainEscape Deck Drainage System of downspouts and troughs diverts water to a rain gutter and away from the space below, creating an indoor environment outdoors. Along with providing a dry area for furniture, the firm says fixtures such as ceiling fans, speakers, and video electronics may be safely installed beneath the system. 

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