Waterproof Decks and Under-Deck Spaces: Creating a Dry Outdoor Area

Deck Builders Staten Island · Sep 17, 2026 · 3m

On this episode of Deck Builders Staten Island, we explain how waterproof deck systems can turn the space under an elevated deck into a dry, useful outdoor area. For homeowners with raised decks, the area below often becomes wet, muddy, or underused because water passes through the deck boards. With the right system and structural planning, that space may become a covered patio, storage area, seating zone, or part of a larger backyard renovation.

We start with the difference between a standard deck and a waterproof deck. A standard deck uses gaps between boards so rainwater can pass through…