Installing Spray Foam for Your Leaking Roof

In this article, we’ll specifically cover what is required to install spray foam for a leaking roof: Spray foam roofing has increasingly become popular over the past years and is now widely used in many business establishments and commercial properties. This roofing method uses the Sprayed Polyurethane Foam (SPF), which is a two-part liquid solution sprayed to form a foam that is ideal for low-slope roofing systems. When sprayed, the solution quickly expands 30 times its volume, creating seamless, lightweight surfaces on your roofing system.

Spraying foam over a leaking roof

First, it is vital to know that installing the spray foam on a leaking roof is only acceptable if the roof is dry, clean, and sound. What’s not allowed is when you already have two roofing systems. We’ll go over the exceptions and factors to consider when installing spray foam in greater detail in the following sections.

Factors to consider when installing spray foam

As mentioned, the spray foam can go over almost any existing leaking roof, as long as it’s dry, clean, and sound. Here’s what you need to consider:

  • Dry roof: Be sure that all water has been removed on your roof prior to the actual installation. This is because even the slightest amount of water can react with the chemicals used for the spray foam, which can compromise the outcome.
  • Clean roof: Make sure that you thoroughly clean your roofing system by getting rid of all contaminants. If it helps, resort to pressure washing to clear first, dust, and other debris completely.
  • Sound roof: Ensure that the outermost roofing layer is fully attached or properly fastened to the insulation below. For instance, a TPO roof mechanically-fastened at the seams using plates and screws may cause some arising problems with your spray foam roof.

Roofing exceptions for installing spray foam

Keep in mind that spray foam must not be installed over a roof with two or more roofing systems. This is for compliance purposes as building codes only allow a maximum of two roofing systems for any commercial property. 

If you have two, you must remove one system before you can legally install a spray foam roof. It’s best to get in touch with a roofing expert for inspection if you aren’t sure how many roofing systems you have. Likewise, be sure to do this before the actual installation of spray foam is performed.

Benefits of installing spray foam for a leaking roof:

If you’re wondering why it’s beneficial to install this modern solution for your leaking roof, consider the following points:

  • Energy efficiency: Installing spray foam makes your commercial property more energy efficient. This means your roofing system won’t easily absorb heat during summer or become cold during winter.
  • Monthly bill reduction: Because of less energy usage and energy efficiency, you can significantly save up on your monthly utility bills. The appliances and the heating and cooling systems in your commercial property don’t have to work harder.
  • Leak prevention: A spray foam roof has no seams where most water leaks occur. With this in place, you can significantly prevent roofing leaks that can lead to potential damages and costly repairs.
  • Longevity: As the penetrations are seamless and fully adhered to in your spray foam roof, you can expect it to last for as long as possible.


At this point, you now know what it takes to install spray foam for your leaking roof system. Consider all the valuable information discussed above, especially the factors and exceptions to consider when opting for an installation. Ultimately, you can take advantage of the handful of valuable benefits of upgrading the roofing system of your commercial property!


We’re your leading spray foam roofing company in Walnut Creek, CA, providing services to both residential and commercial properties. If you’re looking to install and maintain an SPF roofing system, request a free quote by getting in touch with us today!