Closed cell spray foam is one of the most durable and high-performance insulation products available today. It’s a dense foam that hardens after application, creating both a thermal barrier and a moisture barrier. Because of its rigidity, it also adds structural strength to walls, attics, and crawl spaces.

Closed cell foam delivers the highest R-value per inch of any commonly used insulation, which means maximum energy efficiency and lower utility bills. It’s also water-resistant, making it ideal for areas prone to moisture or flooding.

Key Benefits:

Highest R-value per inch (excellent efficiency in less space)

Provides both insulation and an air/moisture barrier

Adds strength to walls and building structures

Water-resistant — protects against mold, mildew, and rot

Long-lasting with minimal maintenance

Best Applications:

Basements and crawl spaces

Exterior walls

Attics with limited space for insulation

Areas with high humidity or risk of water exposure

Closed cell foam is the right choice if you’re seeking top performance, durability, and protection against moisture. While it’s a higher upfront investment, the energy savings and structural benefits often outweigh the cost over time.

Open cell spray foam is a lighter, more flexible type of foam insulation. Unlike closed cell foam, it expands more during installation, allowing it to fill every corner and crevice. This makes it great for blocking air leaks and improving overall comfort throughout the home.

Because it’s less dense, open cell foam is more cost-effective and provides excellent sound absorption in addition to thermal insulation. While it doesn’t resist water like closed cell foam, it’s still a highly efficient solution for interior applications where moisture isn’t a concern.

Key Benefits:

Expands to fill hard-to-reach spaces

Excellent at sealing air leaks and drafts

Provides sound dampening between rooms

More affordable than closed cell foam

Flexible and lightweight

Best Applications:

Attics and roof decks

Interior walls for sound control

Spaces with lots of gaps or irregular framing

Homeowners looking for efficiency at a lower cost

Open cell foam is an ideal solution if your priority is comfort, quiet, and cost savings. It’s perfect for most interior spaces where water resistance isn’t needed.