Foam Board


When it comes to insulation there are many types to choose from, each with their own pros and cons. In the case of Foam board insulation, there are three types that are commonly used in the construction of homes on Long Island, and it is important to know which will provide you with the best results. When it comes to the energy efficiency of your home, your choice of insulation is an important one.

  • Expanded Polystyrene (EPS) foam board, made of Styrofoam beads, is the lesser of the three. This type of foam board has gaps between the beads that allow air and water to migrate.
  • Extruded Polystyrene (XPS) foam board is made from the same compound as EPS but the manufacturing process creates a continuous closed cell matrix that has excellent water and air resistance.
  • Polyisocyanurate or Polyiso foam board is the best type of the three, offering the best water resistance to impede the passage of water. With a foil layer on each side, it offers the best fire rating of the three as well.

All prevent air from leaking through in most conditions and all will provide a reasonable thermal barrier when applied in thicknesses of 1.5″ to 2″ thickness. But, only XPS and Polyiso will stop water from passing through and reduce the chance of mold. Additionally, all need to be sealed along its edges to provide optimal effectiveness. Green Team LI exclusively uses Polyiso and XPS to provide the highest levels of water and air resistance.

Typically, foam board insulation is used for roof insulation, under attic platform as well as in basement and crawlspace insulation. This is due to its ability to prevent the passage of water and air, offering a high level of energy efficiency.

To learn more about foam board, any of our other services, or schedule a free home energy audit, contact us today!


Contact Green Team LI!

Please enable JavaScript in your browser to complete this form.

By submitting, you authorize Green Team LI to reach out via phone, email, or text for information about your project needs. We will never share your personal information with 3rd parties for marketing purposes or spam you. You can opt out at any time. Message/data rates apply. Consent is not a condition of purchase. | Privacy Policy

Apply Today

Green Team LI is proud to be the national winner of Energy Star’s Contractor of the Year, four years in a row

Find out what actual Green Team LI customers have to say about us:

I signed up for an audit at the Smithtown Day festival. They came and did the audit and were very nice. They insulated my attic and changed all my light bulbs. I can’t wait to see my savings this winter.

St. James

I must admit that when I completed the LIPA energy audit and found out that an outside company will be doing the audit, I was skeptical. But, as an energy conscious consumer I kept an open mind. My doubts dissapeared from the first contact with your company.I am a businessman ... Read More

East Northport

This company is efficient and professional. Working with everyone involved was a pleasure.

Huntington NY

The workmen were very neat and precise. I was very satisfied. My heating bill is lower by 25%.

East Northport NY

Green Team LI can help you save big on all your home projects

With all of the rebates and incentives available to New York residents, upgrading the energy efficiency of your home has never been more affordable. From tax and utility incentives to state-subsidized low interest financing, Green Team LI can help you qualify for home performance savings.

Green Team LI Can Help You

Save big

On Your Efficiency Project