Spray Foam Insulation Cost: Closed Cell SPF vs. Open Cell, Pros & Cons

Spray Foam Insulation, also known as Spray Polyurethane Foam (SPF), is considered one of the best insulating, and air sealing, and weatherization materials on the market today. In fact, there is no other material available that comes close to providing the insulation and weather-proofing benefits of SPF.

Spray Foam (SPF) Insulation Overview

Open Cell Spray Foam Insulation Application in between the Wall Cavities.
via GreenBuildingAdvisor.com

SPF is frequently used to insulate and air seal residential, commercial, and industrial buildings. A professionally done spray foam insulation application can completely insulate your home including walls and wall cavities, basements and crawlspaces, roof deck and attic space, as well as help seal those key spaces from the air leaks and moisture penetration.

Did you know? Home insulation upgrades including SPF can result in a more comfortable, healthier, and more energy-efficient home, with an average annual reduction of 15% in home heating and cooling costs. Such an upgrade can be especially consequential for homes located in areas that experience extreme temperatures, whether it be the blistering cold of winter or the sweltering heat of summer.

Once cured and hardened, spray polyurethane foam can actually help strengthen the walls and the roof structure of a house, as well as help protect against moisture, dust, pollen, insects and mold.

Spray Foam can be used in a variety of applications, not just for insulation, and will self-adhere to almost any material including concrete, wood, steel, and most existing roofing materials when spray foam is used as a roofing material for Spray Polyurethane Foam (SPF) roofing applications.

Fun Fact: SPF can even be used to create a tapered roofing system, in which the pitch or slope of the roof is created by the insulation itself!

Before you contact a professional, it’s always a good idea to know something about SPF and which type will best suit your project.

Beyond the Basics:

In this guide, we will answer the following questions:

  1. Cost to Install Spray Foam Insulation
  2. What is Spray Foam (SPF)
  3. Where Can SPF Insulation Be Used
  4. Pros and Cons of SPF
  5. Open Cell and Closed Cell Foams (Structure and Density)
  6. Two-Component vs. One-Component SPF
  7. High vs. Low Pressure Installation
  8. Application and Installation Considerations
  9. Cost Savings and ROI Benefits

Cost to Install Spray Foam Insulation: Closed Cell vs. Open Cell Foam

The national average cost to install spray foam insulation can range between $1.00 and $3.00 per square board foot (1 inch thick) of SPF insulation installed.

For example, to install 1,500 square board feet of one inch-thick Closed-Spray foam insulation in the attic space of a house, it will cost between $1.50 and $2.50 per square board foot, on average, with the total project cost ranging from $2,250 to $3,750, fully installed.

With the Open Cell Foam (a less-costly option), your cost will likely range between $.5 and $1.50 per square board foot (1 inch thick), depending on the size and type of application, accessibility, and your home’s location.

Note: The average cost per square board foot will largely depend on the type of spray foam insulation being installed (closed-cell foam is more costly than open-cell foam), project size (the larger the project the less you will generally pay on per square board foot basis for spray foam), your home’s location (local real estate market and demand for remodeling services), ease of access, and other project-specific variables.

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