Michigan Homeowners: Learn About Spray Foam Insulation Cost!


By Dan Murphy

Summary: Many homeowners in Michigan are caught in a dilemma when it comes to insulating their homes with spray foam insulation. They worry about the costs, aren’t sure how to calculate it, and feel unsure about which type to use. This detailed blog addresses these concerns by providing a step-by-step method to estimate the cost of spray foam insulation, sample estimates for different home areas, and an examination of the factors influencing costs. With this knowledge, you can make an informed decision and see how MAG Insulation can turn your home into an energy-efficient sanctuary.

Estimating the Cost of Spray Foam Insulation

Determining the cost of spray foam insulation may seem daunting, but breaking it down into simple steps can provide a ballpark figure. This section guides homeowners to calculate the cost themselves, focusing on square footage, the type of spray foam, and insulation depth.

Step 1: Find the Square Footage of Your Project

Begin by measuring the area to be insulated. This includes exterior walls, basement walls, attic roofs, or crawl spaces, calculated separately. Measure the length and height of each wall and sum it up to get the square footage. Knowing the area is fundamental because the insulation depth can vary, significantly influencing cost.

Step 2: Calculate Board Feet

Insulation contractors estimate spray foam insulation in board feet, a unit measuring length, width, and depth. To find the board feet, multiply the square footage by the required insulation depth. For instance, an exterior wall might need 3 inches of closed-cell spray foam, whereas basement walls may require 4.5 inches of open-cell spray foam. Using average depths for your climate zone helps in estimating the right board feet.

Step 3: Multiply Board Feet by Cost Per Board Foot

Once you determine the board feet, estimate the cost by multiplying it by the cost per board foot. On average, closed-cell spray foam costs between $1.15 and $1.75 per board foot, while open-cell costs range from $0.25 to $0.75 per board foot. This provides a rough estimate of your insulation expenses.

Sample Estimates for Spray Foam Insulation

To make the calculation clearer, let’s consider some example estimates for different potential insulation projects around the home.

Sample Exterior Wall Estimate

Imagine insulating an exterior wall that is 10 feet tall and 10 feet long. Here’s the calculation broken down:

  • Find Square Footage: 10 feet x 10 feet = 100 square feet
  • Calculate Board Feet: Assuming 3 inches of closed-cell spray foam, multiply 100 square feet by 3 inches = 300 board feet
  • Multiply by Cost: Using $1.45 per board foot, 300 board feet x $1.45 = $435

Sample Basement Walls Estimate

Now, consider insulating basement walls measuring 15 feet wide, 15 feet long, and 8 feet tall. Here’s the breakdown:

  • Find Square Footage: 15 feet x 8 feet x 4 walls = 480 square feet
  • Calculate Board Feet: Assuming 3 inches of closed-cell spray foam, multiply 480 square feet by 3 inches = 1440 board feet
  • Multiply by Cost: Using $1.45 per board foot, 1440 board feet x $1.45 = $2088

Sample Roof Estimate

Lastly, consider insulating a roof that’s 30 feet long, 6 feet high, and 20 feet wide, with a rake (or pitch) of 15 feet. Here’s how:

  • Find Square Footage: 30 feet x 20 feet = 600 square feet (additional complexity with rake needs dividing into smaller sections and adding; say adds up to 820 square feet total)
  • Calculate Board Feet: Assuming 5 inches of closed-cell spray foam, multiply 820 square feet by 5 inches = 4100 board feet
  • Multiply by Cost: Using $1.45 per board foot, 4100 board feet x $1.45 = $5945

Factors Influencing the Cost of Spray Foam Insulation

While the above estimates provide a rough cost idea, several factors can influence the final price. Let’s explore some of these:

Raw Material Costs

**Spray foam** prices can fluctuate based on market conditions, similar to commodities. If petroleum prices rise, so can spray foam costs, since it’s a petroleum-based product.

Labor Costs

The complexity and size of your project can affect labor costs. Some areas may be hard to access or require more preparation, impacting labor time and consequently the overall costs.

Project Complexity

If your project includes irregular shapes, multiple layers, or varied insulation depths, the overall project complexity increases, affecting the final cost.

Contractor Expertise

Quality and expertise significantly affect cost. Highly skilled contractors might charge more, but they ensure the job is done correctly, often saving money in the long run.


Calculating **spray foam insulation** costs on your own may seem challenging at first, but breaking it down into a few simple steps makes the task manageable. Always measure each area separately, consider the required insulation depth, and multiply the resultant board feet by the cost per board foot for a rough estimate. While this gives a general idea, consulting with a professional contractor is crucial for an accurate quote tailor-made to your project.

For all your insulation needs, MAG Insulation offers state-of-the-art spray foam services. Our team comprises seasoned professionals dedicated to maximizing your home’s energy efficiency and comfort. Don’t hesitate to get in touch for a customized quote precisely aligned with your insulation requirements.

Be sure to check out other informative posts on our blog, such as Seal Out Winter: Simple Hacks to Keep the Cold at Bay and Slash Your Heating Bills and Slash Bills, Boost Comfort: Mastering Spray Foam Insulation Costs. Stay informed to make well-versed decisions for your home’s insulation needs!

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