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Residential Roofing

Foam Roofs in Arizona – The Definitive 101 Installation Guide


A foam roof, or Sprayed Polyurethane Foam (SPF), is not just a layer of insulation; it’s a complete roofing system that offers numerous benefits, especially in the harsh climate of Arizona. This article will dive deeper into foam roofs, exploring their advantages, sustainability, and specifically, the installation process in detail.

Decoding the Foam Roof

An SPF or foam roof is formed from the combination of isocyanate and polyol. These components are passed through a proportioner, which heats and pumps them to a spray gun. Here, they are mixed and sprayed onto the substrate. As the liquid is sprayed onto the roof, it creates a single continuous structure that is seamless and very stable. For proper application, SPF requires a clean, dry surface that is free of contaminants like oil and properly fastened to the substrate in line with building codes. Lastly, a protective elastomeric top coat is applied, typically sprayed on to complete the process.

Key Advantages of Foam Roofs

Promoting Energy Efficiency

Foam roofs provide a notable advantage in terms of energy efficiency. The system consists of a one-inch thick closed cell polyurethane spray foam topped by a UV reflective layer. This duo guards against Arizona’s harsh climate and extends the life of the polyurethane layer. The system’s excellent insulation helps maintain cool air within the home, leading to potential savings on electricity bills.

Durability and Longevity

Foam roofs are lightweight, reducing structural stress, and offer excellent longevity, thereby ensuring a high return on your roofing investment. Re-application of the UV protective layer every 7-10 years (frequency depends on the quality of coating chosen and properly maintaining your roof) will significantly extend the foam’s lifespan, potentially matching the lifespan of the structure it protects.

Seamless and Waterproof

As the foam is applied as a single monolithic membrane, it lacks seams or joints that could leak or fail, providing a very effective waterproof seal. It’s self-flashing and can easily adapt to irregularly shaped roofs, penetrations, curbs, and parapets, ensuring complete coverage and protection.

Ease of Additions

In situations where stacks or other roof penetrations need to be moved or added, SPF provides easy integration. The foam can be sprayed onto virtually any surface, facilitating easy and efficient management of irregularly shaped roofs and protrusions.

Embracing Sustainability

Foam roofs require minimal upkeep, create little waste, and have a practically indefinite lifespan, making them a sustainable roofing choice.

Unraveling the Installation Process of Foam Roofs

The installation of a foam roof is a relatively straightforward process, encompassing steps such as preparing your roof, applying the foam and coating, and performing a thorough quality assurance check.

Preparing Your Roof

Preparation involves cleaning the roof surface thoroughly to remove debris, dirt, and moisture. Depending on the situation, the foam can be applied directly onto the roof deck or over an existing roof system.

Application of the Foam

The foam layer is sprayed onto your roof as a liquid and quickly dries and solidifies to form a solid, durable, and energy-efficient layer. The foam layer adheres to the roof, providing a tight seal against the building.

Applying the Protective Coating

Once the foam layer has cured, protective coatings are applied to increase durability and resistance against the weather. This step finalizes the creation of a waterproof seal.

Quality Assurance Check

A final quality assurance check ensures that the roof is fully sealed and protected.


To summarize, foam roofs offer a myriad of benefits, making them an excellent choice for commercial buildings in Arizona. They provide superior energy efficiency, are easy to install and maintain, and deliver robust protection against various weather conditions. With professional installation and regular maintenance, a foam roof can serve your building efficiently for many years.

Frequently Asked Questions

What are the downsides of foam roofs?

While foam roofs provide many advantages, they have a few disadvantages, including the need for professional installation, potential for overspray during application, and the requirement for regular maintenance and re-coating to ensure optimal performance and longevity.

How long do foam roofs last?

With proper maintenance and re-coating, foam roofs can last indefinitely. Regular re-application of the UV layer every 7-10 years, depending on the coating quality, can dramatically extend the foam’s lifespan.

Are foam roofs expensive?

The cost of foam roofs can vary, depending on factors such as roof size and specific installation requirements. However, the long-term savings in energy costs and reduced maintenance can make foam roofs a cost-effective choice in the long run.

How efficient is a foam roof?

Foam roofs are an excellent roofing option, particularly for commercial buildings and homes in harsh climates like Arizona. They offer superior energy efficiency, durability, and a seamless, waterproof seal. With proper installation and maintenance, a foam roof can provide reliable, long-lasting protection.

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