Spray Foam Insulation Cost: Spray Insulation Cost Guide

Spray foam insulation cost ranges from $1,400 to $5,800 (coverage area of 1,000-sf with 3-inches of insulation). Closed cell spray foam cost ranges from $0.80 to $1.90 per board foot. Open cell spray foam cost ranges from $0.50 to $1.20 per board foot. To get a more accurate cost for your foam insulation project, request a quote.

By HomeBlue Team

May 18, 2022 09:08 AM

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How Much Does a Spray Foam Insulation Cost?

This guide is intended to provide you an approximate spray foam insulation cost in your area. To get a quote for your specific project, Click Here for a Free Estimate. Our research, which includes feedback provided by spray foam insulation contractors, resulted in the following spray insulation cost.

Spray foam insulation cost:

Spray foam insulation cost ranges from $1,400 to $5,800 (coverage area of 1,000-sf with 3-inches of insulation). Prices vary based on the type of insulation installed. Open cell insulation is less expensive (lower end of range) and closed cell insulation is more expensive (upper end of range). Keep in mind that open cell foam insulation has a lower R-value than closed cell. Closed cell foam insulation is about twice as energy efficient per inch (which is one of the reasons it is more expensive). However, open cell insulation is a much more efficient sound barrier. Consult with a contractor to discuss the benefits of each type.

Spray foam insulation cost (closed cell foam insulation):

Closed cell spray foam insulation ranges from $0.80 to $1.90 per board foot. Each sprayed layer expands to about one inch (R-value of around 7). Exterior walls may need up to 3-inches of closed cell insulation (which has an R-value of about 21) and attics typically need 3-inches (R-value of 21) to 5-inches (R-value of 35). Colder environments may require additional layers in the attic and moderate climates may require fewer.
Definition of Board Feet: The term board feet refers to a 1-foot (length) x 1-foot (width) x 1-inch (height) of insulation. If you wanted to spray 3-inches of insulation onto a 20-ft by 50-ft attic roof, the calculation would be 20 x 50 x 3 = 3,000 board feet. Another way of saying it is that 1,000-sf area with 3-inches of insulation = 3,000 board feet.

Spray insulation cost (closed cell insulation) based on the number of board feet:

Closed cell spray insulation cost for 3,000-bf (1,000-sf with 3-inch insulation): $2,300 to $5,800.
Closed cell spray insulation cost for 4,500-bf (1,500-sf with 3-inch insulation): $3,400 to $8,700.
Closed cell spray insulation cost for 6,000-bf (2,000-sf with 3-inch insulation): $4,600 to $11,600.
Closed cell spray insulation cost for 7,500-bf (2,500-sf with 3-inch insulation): $5,700 to $14,500.
Closed cell spray insulation cost for 9,000-bf (3,000-sf with 3-inch insulation): $6,900 to $17,400.

Foam insulation cost (open cell spray foam insulation):

Open cell spray foam insulation ranges from $0.50 to $1.20 per board foot. This type of insulation typically expands to about 3-inches per layer. Most commonly, it has an R-value of 3.5 to 3.6 per inch which means a 3-inch layer has an R-value of approximately 10.5 to 11. Since open cell foam expands to about 3-inches, only one application of open cell can be used in walls (which means the max R-value of the wall will be around 11). In attics, there is often enough room to apply two layers (around 6-inches), which would increase the R-value to around 22.

Foam insulation cost (open cell insulation) based on the number of board feet:

Open cell foam insulation cost for 3,000-bf (1,000-sf with 3-inch insulation): $1,400 to $3,500.
Open cell foam insulation cost for 4,500-bf (1,500-sf with 3-inch insulation): $2,100 to $5,200.
Open cell foam insulation cost for 6,000-bf (2,000-sf with 3-inch insulation): $2,700 to $7,000.
Open cell foam insulation cost for 7,500-bf (2,500-sf with 3-inch insulation): $3,400 to $8,700.
Open cell foam insulation cost for 9,000-bf (3,000-sf with 3-inch insulation): $4,100 to $10,500.

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Factors that Influence Spray Insulation Cost

When spray foam companies come to provide you an estimate, they will consider several factors that can increase or decrease the cost of your project. Pricing for your foam insulation project will vary based on the type of insulation (open or closed cell) and the number of inches installed. Here are a few things to keep in mind when you get quotes from spray foam installers:

Your prices may be higher when:

Closed cell insulation is installed.
You are trying to achieve an R-value of higher than 20.
Existing insulation needs to be removed.
The project involves a fully built home (walls and ceilings are finished).
The project is located in a high cost area.
Insulation needs to be injected into walls.
Attic is difficult to access or navigate.
The property is difficult to reach (traffic or location).

Your prices may be lower when:

Open cell insulation is installed.
You are trying to achieve an R-value of less than 20.
No existing insulation needs to be removed.
Insulation can be installed during construction (walls are open).
An attic is easy to navigate.
The project is located in a low cost area.
The location of the project is easily accessible (easy to get to).

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How Much Does a Spray Foam Insulation Cost Near Me?

Spray insulation cost varies from area to area. We have developed a number of spray foam insulation cost guides to help you identify the foam insulation cost near you.