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How does Spray foam expand? - R&A Contracting

When business owners think about spray foam, it’s hard to see how foam could be used to fit and fill any crack or crevice on a roofing system. How does spray foam work? First, spray foam is created from two chemicals in liquid form: isocyanate and polyol fiber. The two liquid chemicals are often delivered to the job site in massive drums to protect against leakage and ensure secure delivery.

Our R&A Contracting team uses a spray applicator gun to precisely apply the dual compound into place. The ‘gun’ is connected to two tubes, each tube separately drawing from the two drums. When the installation team confirms the new application is clear of debris, the installer activates the system and starts spraying the foam into place.

How does spray foam expand?

When the two chemicals come into contact with each other, it initiates an immediate expansion process. The spray foam also has a ‘stickiness’ to it that helps the spray foam adhere to any substrate it contacts during the expansion process. Spray foam can expand up to thirty times its liquid density. This helps the spray foam fill and seal off even large cracks and openings.

What makes spray foam ‘foam’?

So, if the liquid spray foam is expanding, what makes the ‘foam’ part of spray foam? During the expansion process, which is sometimes called “foaming,” microscopic gas bubbles are trapped inside the material as it closes in on the cells. Spray foam that contains gas bubbles is called ‘closed-cell spray foam’. If spray foam only captures air bubbles, it’s called ‘open-cell spray foam,” which is not as strong as closed-cell SPF.

Why use spray foam?

Spray Polyurethane Foam, or SPF as it’s more commonly known, gives unparalleled flexibility for installation. Most commercial roofing solutions are panel-based or fixed-size pieces that require flashing, fasteners, and seals, among other hardware. Spray foam can be applied on any roofing substrate. It also does not require any form of flashing, fasteners, or any other hardware.

There’s a reason why SPF roofing is the most effective roofing solution available today. Don’t believe us? Schedule your complimentary on-site inspection to start a conversation about SPF roofing.

I’d be an idiot if I did not take this opportunity to communicate to you how much we appreciate the way in which you conduct business and take care of our facility. In my experience you, and your team, are at the top of the list of all the roofing companies I’ve dealt with over the years. Thank you!

Jim Lowry - Bissinger's Handcrafted Chocolatier

Eric and crew were really nice to have around. They were courteous, careful and caused little if any disruption. Their work looks good too! To be honest… a good experience with a product that I initially had misgivings about. I’m a convert because of Bubba, Sam and Eric. Thank you.

Jim Lowry - Bissinger's Handcrafted Chocolatier

“I want to thank the crew at R&A for a job well done on our very leaky roof at the shop. It is certainly nice to have the drips and rivers gone from the shop when it is raining. I also wanted you to know how much we appreciated that the guys were able to stay out of our way and allowed us to do business as usual without any problems or interruptions. The roof looks great and the clean-up after the job made it so we couldn’t even tell you’d been here. Thanks for doing what you do so well!”

Jay Moore, President of Safe Way Tire and Auto Center

“My wife and I were on vacation when water pipes burst in our house. We got a hold of Craig and the R&A crew was able to start evacuating the water immediately. The best part was that they were able to start work before we even returned home. It was a very fast turnaround considering the extensive amount of water damage.”

Will from Dardenne Prairie, MO

“Craig and Mike came out in a timely fashion when we needed the work done. They did a reliable and quality job.”

Jerry from SLR Properties

“Craig helped us out tremendously with the insurance process. Timely and very professional.”

Lindell from Greater Missouri Builders (GMB)

“We purchased a house and there was some damage to the roof. Very impressed with the thoroughness of Mike’s inspection. Very comfortable with their explanation of what needed to be fixed. Most impressive was the way they protected our landscaping. Really liked the way they treated me as a valued customer, even though it was only a small project.”

Ross from Troy, MO

“I use R&A Contracting when my commercial roofs receive storm damage. They work on our behalf through every step of the insurance claim process. They perform all of the work and complete the insurance process, making our roofs better than they were before the storm.”

Director of Facilities for a large Property Management Company

“The team at R & A Contracting responded immediately when notified of our water disaster. They removed water-damaged materials and property quickly and restored our home even before the final settlement from our insurance company. They minimized how long our family had to live in a hotel and got us back to normal as fast as possible.”

Will from O'Fallon, MO