Waterproofing an Upstairs Deck: When You Need a System, Not Just a Coating

Deck Builders Knoxville · May 28, 2026 · 2m

Deck Builders Knoxville takes a close look at something homeowners with elevated decks often overlook: real waterproofing. In this episode, we explain why brushing on a simple coating is not enough when you have living space, storage, or a patio underneath your deck. An upstairs deck that sits over a porch, walk-out area, or finished space needs a proper waterproof system that manages water from the surface all the way to the edges and downspouts. Without it, leaks can slowly damage framing, drywall, and finishes below, turning a nice outdoor upgrade into a costly repair project.

We walk…