Best Applications for Open-Cell and Closed-Cell Foam Insulation

worker installing blow-in insulation | Atticare


Spray polyurethane foam (SPF) insulation is highly effective at reducing air leakage in a range of applications, including attics and crawlspaces. At Atticare, our experienced technicians install both open-cell and closed-cell spray foam and can provide a recommendation based on your application. To learn more, call us at 1-866-692-5449.

Closed-Cell Foam

The most common type of SPF, closed-cell foam is much denser and boasts a higher R-value than open-cell foam. This means that it’s significantly more resistant to heat flow, as well as water penetration and moisture buildup. Closed-cell foam can also withstand water in large amounts, making it a great choice for homes in flood zones. In addition to these qualities, closed-cell foam also features a glue-like tenacity, which adds structural strength to walls, ceilings and other areas of the home. Other benefits of closed-cell foam include:

  • Withstands hail-related damage and roof leakage during hail storms
  • Reduces mold and mildew growth by minimizing air infiltration
  • Offers excellent wind uplift resistance in areas prone to hurricane-force winds

From new construction to retrofit applications, closed-cell foam makes an excellent air and moisture barrier and vapor retardant.

Open-Cell Foam

With a lower R-value than closed-cell foam, open-cell SPFs are mainly used in interior applications where there’s no direct contact with water. Open-cell foam expands when applied, hermetically sealing the area and making it great for hard-to-reach nooks and crannies, wall cavities and under roof trusses. Additional advantages of open-cell foam include:

  • Provides twice the sound resistance in normal frequency ranges than closed-cell foam
  • Requires less materials than closed-cell foam for greater affordability
  • Accommodates long-term creep, or slow flow, and seasonal movement to prevent deformations and shifts in placement over time in response to the influence of temperature and other stresses

However, compared to closed-cell foam, open-cell is more permeable to vapor and air and provides less structural support to walls, making it a less common insulation option.

Spray Foam Insulation from Atticare

Serving Northern and Central New Jersey, Atticare provides spray foam insulation and other essential residential and commercial services to homeowners and businesses throughout New Jersey. As a nationwide company with over 15 years of experience, we’ll take the time to listen to your unique needs and recommend a spray foam solution that improves your indoor comfort. To schedule a free consultation or for free advice, contact us today.