Stop Letting Cold Air In: Detroit Homeowners Are Losing Heat Through Leaky Walls and Basements

Detroit winters are unforgiving. With temperatures regularly plunging into the single digits and moisture from Lake St. Clair and Lake Erie creating a biting chill, homes that aren’t properly sealed can turn into money pits. For homeowners in Wayne, Oakland, and Macomb counties, this means not just discomfort, but rising utility bills and long-term structural damage from cold, damp air.

Spray foam insulation is the most effective solution for Michigan’s Zone 6A climate. Unlike traditional fiberglass or cellulose, spray foam creates an airtight barrier that stops drafts and prevents moisture intrusion — crucial in a region that averages 6,500 heating degree days each year.

Open-Cell vs. Closed-Cell: What Works Best in Your Detroit Home

Most Detroit homes built in the 1940s–1970s have framing that isn’t airtight, especially around rim joists, windows, and doors. Two types of spray foam are used for different applications:

• Open-cell foam is ideal for attics and interior walls. It expands more, is less dense, and provides good airflow resistance without fully sealing the space. It works well in dry areas and is typically priced between $1.00 and $3.00 per board foot.
• Closed-cell foam, on the other hand, is more rigid, has higher R-value per inch, and acts as both an insulator and air barrier. It’s the best choice for rim joists, crawl spaces, and below-grade areas like basements, where moisture is a concern. It costs between $1.50 and $5.00 per board foot.

In a typical Detroit-area home, we often combine both types. Open-cell in the attic for comfort and energy savings, and closed-cell in the basement or under the floor to stop cold air and moisture from seeping in.

A Real Fix in a Real Home: Livonia Split-Level Case Study

One of our clients in Livonia came to us after noticing frost forming on the interior walls of their 1965 split-level basement — a clear sign of cold air infiltration. We sealed the entire rim joist and basement wall with 2 inches of closed-cell foam, covering about 1,400 square feet. The result? No more frost, and a 34% drop in energy bills during the following heating season.

Cost and Savings: What You Can Expect in Detroit

Spray foam insulation for a typical Detroit home ranges from $2,500 to $6,500, depending on the home’s size, age, and the areas being sealed. While the upfront cost may seem high, the long-term savings on heating and cooling, along with the protection it provides your home, make it a smart investment.

DTE Energy Rebates: Save More While Insulating

If your home is in DTE Energy’s service territory — that includes most of Wayne, Oakland, and Macomb counties — you may be eligible for rebates through their home efficiency programs. These rebates can reduce your out-of-pocket costs for qualified insulation work, including spray foam.

Last updated: June 2026