Benefits of Spray Polyurethane Foam (SPF) roof systems [+ video]

Foam roofing systems provide many benefits to home and building owners, including waterproofing, insulation value, superior strength, light weight, durability, uplift wind resistance, and longevity.

Spray Polyurethane Foam, or "SPF", has been around for over 40 years. It is applied as a liquid using plural-component spray equipment and expands 30 times its original liquid volume to form a hard, closed-cell monolithic roof surface. Polyurethane foam dries within seconds after it is applied to the roof surface, resulting in a weather-tight roofing membrane that is fully adhered to the substrate.

Once the SPF has been applied to the proper thickness and finish specifications, a protective layer of elastomeric, acrylic, silicone, or polyurethane coating or granule is applied. This protective layer produces a durable, weather-resistant surface and that can be walked on for normal maintenance.

If a white roof coating is chosen, further energy efficiency and sustainability benefits will be realized over the life of the roof as well.

Spray polyurethane foam roofing systems have good adhesion to a variety of substrates, including metal, wood, concrete, modified bitumen, asphalt shingle, clay tile, and built-up, so in many cases this is a viable alternative to re-roofing.

With facilities budgets being more carefully managed in today's economy, there is a growing desire by roofing contractors to provide owners with durable, long-lasting yet affordable roofing systems that combine high energy performance with low maintenance costs.

Under suitable environmental conditions, a relatively small crew can install large jobs and tear-off is usually not required, which keeps costs and project durations low. Although SPF may be a good fit for your building, it does take an experienced, certified contractor to specify, install, or maintain these systems correctly.

How long do foam roofing systems last? Multiple studies conducted by the National Roofing Foundation found that SPF roofs have an effective service life of more than 30 years, assuming proper and regular inspections, cleaning and maintenance are performed. SPF roofing systems typically are re-coated every 10-15 years to maximize the life of the roof system.

SPF roofing systems vary widely in cost depending on the foam thickness required, the type and thickness of the coating or covering, the degree of substrate preparation, availability of contractors in a specific region, and other factors. As with other roofing systems there are both high-end and low-end material.

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