Why Install a Drainage System? An under-deck drainage system creates dry space below the surface of a deck that can be used as a patio, outdoor kitchen, private spa area, bonus storage and more. These ...
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How to build an under-deck roof

Inexpensive roof panels keep it dry down below ...
To take advantage of the space beneath a second-floor deck, consider installing an underdeck. As a ceiling to the underside of the deck it also protects the area from rain and snow. The vinyl material ...