Moisture and vapor control goes in first because everything else depends on it. The dimpled membrane creates an air gap between the foundation wall and the framing, so any moisture that does work its way through the concrete has somewhere to go. Sealed penetrations and a continuous vapor barrier keep humid summer air from condensing on the back side of cold below-grade walls. This is the layer the 2025 Michigan basement finishing guide spends the most time on for a reason.

Below-grade insulation sits between the foundation and the new stud wall. Climate zone 5A, where the bulk of Southeast Michigan falls, calls for R-15 minimum on basement walls. Rigid foam outperforms batt insulation here because it doesn’t absorb moisture and it bridges the thermal gap of the concrete itself.

Framing and rough-in follow the moisture and insulation work. Treated bottom plates sit on a sill seal a half-inch off the slab. Stud walls are sized to leave the dimpled membrane an air channel for any moisture that does work its way through. Electrical runs to current code, with separate circuits for any wet rooms, GFCI protection where required, and arc-fault protection on living-space outlets. Plumbing for basement bathrooms ties into either the existing stack or a sewage ejector if the bath sits below the main waste line. HVAC gets its own supply and return runs if the basement is conditioned space, and the team verifies that the existing furnace can handle the added load before the rough-in goes in. Every rough-in inspection has to pass before the walls close.

Drywall, flooring, and finishes are the layers homeowners think of when they think about finishing. Type X firecode drywall goes on any wall shared with a utility room or the area around the furnace. Luxury vinyl plank or engineered hardwood floats over a moisture-rated underlayment, with a perimeter expansion gap that the baseboard hides. Trim, paint, and hardware close out the project. By the time these layers go on, the structural and infrastructure work is done and the room behaves like the rest of the house. Basement remodeling projects in an already-finished space pick up at this layer, skipping the moisture and framing work if the original build did it correctly.

The order matters because each layer depends on the one beneath it. A vapor barrier installed over wet concrete traps the moisture in. Insulation framed against an untreated foundation wall wicks water into the studs. Drywall hung before the rough-in inspections passes means tearing it back down. Wright’s runs the layers in sequence, gets each one inspected where required, and only moves on when the previous layer is signed off.