Below-Deck Drainage

Protected Space Underneath

An elevated deck creates valuable covered space beneath it—but only if you manage the water that inevitably drains through the deck surface. Without a below-deck drainage system, that space becomes a perpetually damp zone where water drips onto anything stored below, moisture promotes mold growth on the deck framing, and what could be functional outdoor living space sits unusable.

We install integrated drainage systems using corrugated trough panels or membrane-and-gutter assemblies that capture water at joist level and channel it to perimeter collection gutters. The system pitches precisely toward downspouts that connect to your building's drainage infrastructure. For finished ceiling applications, the drainage layer sits above a ceiling system that creates a clean, finished appearance while maintaining full water protection.

The result effectively doubles your outdoor living space: usable deck above, protected patio or storage below. You can install lighting, ceiling fans, and even outdoor entertainment systems in a space that stays dry through Chicago's heaviest rainstorms. Combined with proper deck framing protection, these systems extend the life of your entire deck structure by keeping the substructure dry.