Spray Polyurethane Foam: What Is It?

Whether you’re new to a spray polyurethane foam or simply interested in learning more, this article will answer the question, “What is Spray Polyurethane Foam?” You will learn more about the differences between open-cell and closed-cell foams, as well as the benefits and drawbacks of each. You’ll also learn about these foams’ longevity and how to seal your home against leaks.

Seals Against Leaks

Using spray polyurethane foam Chalfont PA to seal against leaks has improved energy efficiency and protects buildings from natural disasters. It is a high-performance solution that delivers unequaled air-sealing properties for the entire building envelope.

Sealing leaks has several benefits, including improving energy efficiency, comfort, and utility costs. Sealing air leaks is also a great way to reduce greenhouse gas emissions. In addition, it is an easy way to prevent mold and mildew growth in your home.

There are several types of spray polyurethane foam to choose from. One is the expandable foam. This type of foam quickly transforms into thick, rigid foam insulation. It is also great for sealing larger cracks.

The water-based foam sealant is ideal for minor cracks but will require air time to dry. It takes about 24 hours for the sealant to cure.

Open-cell vs. closed-cell

A sound air barrier in a building is essential to keep conditioned air inside. While it is true that closed-cell spray polyurethane foam and open-cell spray polyurethane foam provide an air barrier, it is essential to understand their differences.

Open-cell spray foam is lighter and less dense than closed-cell foam. Open-cell foam is also more flexible and breathable. In addition, it contains air, which helps it to conform to objects. It is also able to return to its original state when compressed.

Open cell foam can effectively seal tough-to-reach areas of the home. On the other hand, closed-cell foam is more resistant to water and more durable. In addition, closed-cell spray foam can be used to help strengthen walls and to prevent mold growth.

GREENGUARD Gold certified

GREENGUARD Gold-certified spray polyurethane foam insulation is ideal for commercial and residential applications. It is low VOC and excellent performance. It also offers a vapor retardant and air barrier and is structurally supportive. It is best used with proper ventilation.

GREENGUARD Gold certification is the gold standard of eco-certifications. Products are required to meet shallow emissions limits. They also must meet health-based criteria for additional chemicals. These include phthalate plasticizers and halogenated flame retardants. These chemicals can be found in many products, including packaging, flooring, paints, and adhesives.

The certification process is rigorous, and products must undergo manufacturing review and compliance evaluation. The GREENGUARD Certification program is referenced in numerous building standards around the world. A GREENGUARD Certified product may contribute credits to many building codes, including the NAHB Green Building Guidelines, the LEED Green Building Rating System, and the Collaborative for High-Performance Schools.


Among the many insulation materials, polyurethane offers various advantages and disadvantages. There are two types of polyurethane: open-cell and closed-cell varieties. Choosing one of these is based on the building’s needs and environment.

Closed-cell polyurethane foam is ideal for exterior applications, including exterior walls, flooring, and ceilings. This type of material provides the best insulating and strength characteristics. It can also be used for interior walls. The cellular structure of this foam makes it resistant to moisture. It also provides an excellent air barrier. The material is very flexible.

On the other hand, open-cell polyurethane foam is more brittle and less resistant to moisture. This type of foam can be used for interior applications, but it does require trimming once it expands. This foam also has less R-value per inch.


Depending on the application, spray polyurethane foams can last for decades. The longevity of spray foam insulation is determined by several factors, including the protective coating applied, the chemistry used, and the temperature at the time of application. Despite the longevity of spray polyurethane foam, it’s still wise to maintain the material’s longevity by following some essential maintenance tips.

There’s no doubt that spray polyurethane foams can provide several benefits, from increased energy efficiency to improved indoor air quality. However, they are meant for use only in some building parts. While they may help reduce moisture infiltration, they can’t take the place of a shingle. Finding the best application is the best way to get the most out of your spray foam.