Waterproof Deck Systems
A waterproof deck is a system, not a surface. Done right, a continuous membrane, properly detailed flashing, and a clear drainage path keep water out of the framing and living space below for years.
Full Assembly, Not a Coating
The waterproof layer sits beneath the walking surface, over a prepared substrate, with every seam and edge detailed properly.
Drainage Designed In
Water has to go somewhere. Slope, drains, and scuppers are planned so water leaves the deck instead of pooling on it.
Details That Last
Flashing at walls, door thresholds, and posts is where most leaks begin. Those details get the most attention.
Where Waterproof Decking Is Used
The walking surface is not what keeps water out. On an elevated deck, waterproofing comes from the layer beneath the surface — the membrane — and from how that membrane is tied into the walls, thresholds, and drains around it. A beautiful surface over a poorly detailed membrane will still leak.
Assembly matters as much as material. Membrane type, substrate condition, deck slope, and drainage all interact. A system that works on one deck can fail on another if the assembly is different. That is why we look at the whole build before recommending an approach.
Get the details right the first time. Most waterproofing failures trace back to a detail rather than the membrane itself — a wall transition, a fastener penetration, a threshold that was never flashed. Spending the time on those details at installation is what separates a deck that lasts from one that leaks within a few seasons.
Related Deck Waterproofing Services
Planning a New or Rebuilt Deck?
Tell us about the deck and what sits below it. We'll help you think through the right assembly.