Deck Roofing Systems

Under-Deck Membrane Protection

When you build a rooftop deck, the pedestal system and pavers create a hidden zone beneath the walking surface—a space that stays perpetually shaded and takes longer to dry out. Standard roofing materials weren't designed for these conditions. Under-deck environments trap moisture, restrict airflow, and make leak detection nearly impossible once finished. Chicago homeowners discover this the hard way: a small membrane failure goes unnoticed for months until water damage appears inside. Deck roofing systems require membranes engineered specifically for covered, low-visibility installations.

We install under-deck membranes designed to handle the demands of elevated deck assemblies. PVC and TPO systems with hot-air welded seams eliminate adhesive failures in high-moisture environments. Fully-adhered applications prevent water migration between the membrane and substrate—critical when leaks can't be spotted from above. We integrate internal drainage channels that move water to visible collection points, and we detail every pedestal penetration to maintain the watertight envelope. The deck's weight and foot traffic add load the membrane must accommodate without stress cracking.

Our approach coordinates the roofing membrane with your complete deck system before construction begins. We specify compatible membrane types that won't degrade under rubber pedestals or react with aluminum framing. Slope tolerances get verified so water drains to designated points rather than ponding beneath your pavers. The result: a protected space below your deck that stays dry for decades, whether you're using it for mechanicals, storage, or simply keeping water out of the living space underneath.