Closed cell spray foam creates a great air seal and vapor barrier when applied. The closed cells in this material are pressed together making it a dense and rigid product that keeps moisture and air out and supports the structural integrity in a home. This insulation application has a high R-value of roughly 6.2 to 7.0 per inch, making it the premier choice for sound and temperature control. Even with its high-quality finish, it is still an affordable choice for your next home project.