Michigan winters are expensive.
Spray foam stops the leak.

Open-cell spray foam runs $1.50–$2.50 per square foot installed in the Detroit and Grand Rapids metro areas. Closed-cell runs $2.00–$3.50 per square foot. For a typical Southeast Michigan home, often a 1,200–1,800 sq ft ranch or colonial built in the 1960s or 1970s, most homeowners pay $2,500–$6,500 for a full attic and basement wall treatment. We price by the job so you know the total before we start.

Rim joists and basement walls. The majority of Michigan homes built between 1950 and 1990 have uninsulated or poorly insulated rim joists, the perimeter framing at the top of the foundation. That band of wood is directly exposed to outdoor temperatures all winter and is typically stuffed with compressed fiberglass that has lost its R-value. Closed-cell spray foam on the rim joist and basement walls eliminates cold floors, pipe-freeze risk, and a significant share of heating loss.

Yes, and it's one of the highest-ROI applications in Michigan's climate. Michigan basements face two threats: cold winter air infiltrating through the rim joist and above-grade foundation walls, and ground moisture pushing through poured concrete or block foundations. Closed-cell spray foam applied to the interior of basement walls and rim joists addresses both simultaneously, sealing air infiltration, adding continuous R-value, and acting as a vapor retarder against moisture migration.

DTE Energy and Consumers Energy both offer rebates for qualifying insulation improvements through their Home Energy Efficiency programs. Rebate amounts vary by measure and eligibility, attic air sealing and insulation upgrades typically qualify. We recommend checking current program details on dte.com or consumersenergy.com before your estimate appointment, as program caps and per-measure amounts change annually. We can help document the work in a format that supports your rebate application.

Most residential jobs complete in one day. A rim joist and basement wall application in a standard Southeast Michigan ranch or colonial typically runs four to six hours. Attic air sealing over an existing attic floor runs similarly. Larger homes or restricted-access crawl spaces may extend into a second day. Foam cures within 24 hours and you can use the space normally after that.

For air sealing and moisture control in Michigan, both critical given lake-effect winters and basement moisture, closed-cell spray foam outperforms blown-in cellulose in the rim joist and basement wall application because it stops air movement and acts as a vapor retarder, not just a thermal barrier. In the attic floor over conditioned space, the right answer depends on the existing air-sealing layer: if air bypasses are addressed, blown-in cellulose is a cost-effective R-value top-up. We assess each application and recommend the right approach, not a one-product-fits-all strategy.