Before you say yes to SPF roofing, there’s one thing your contractor should tell you upfront: it can’t be installed in the rain — and that’s just the start of what you need to know.
SPF roofing offers strong insulation and a seamless, leak-resistant surface — but it also comes with weather-dependent installation and a few maintenance considerations. Here’s a balanced look at both sides.
Advantage: Seamless, Leak-Resistant Surface
Because SPF is applied as a liquid and expands to cover the entire roof, there are no seams or joints where water typically finds its way in. For commercial buildings with flat or low-slope roofs, this is one of the biggest advantages over traditional membrane systems.
Advantage: High Insulation Value
SPF has one of the highest R-values per inch of any roofing material, meaning it insulates better without adding excessive thickness. That can translate into a more stable indoor temperature and less strain on HVAC systems.
Advantage: Can Be Applied Over an Existing Roof
In many cases, SPF can go directly over the current roofing system, which means property owners may be able to avoid a full tear-off when addressing an aging roof.
Disadvantage: Weather-Dependent Installation
This is one of the most important things to know before scheduling SPF work. Installation requires dry conditions, calm wind, and a minimum outdoor temperature — generally above 50°F. SPF cannot be installed when it’s raining, snowing, or when the existing roof has frost, ice, or surface moisture, since the foam needs a clean, dry surface to properly bond and cure.
For commercial property owners, this means SPF installation typically needs to be scheduled around the weather, and a project may need to be rescheduled if conditions change unexpectedly.
Disadvantage: Sensitive to Wind During Application
Because SPF is sprayed on, windy conditions can cause overspray, where the foam drifts beyond the intended area. Installers typically take precautions, like edge shields, but it’s a factor that limits the days a project can move forward.
Disadvantage: Requires a Trained, Certified Applicator
SPF installation involves precise mixing and application of two chemical components. Incorrect application can affect how the roof performs over time, so it’s important to work with a contractor experienced specifically in spray foam roofing.
Is SPF the Right Choice for Your Building?
Every roof and every climate is different, which is why a professional assessment is the best way to determine if SPF roofing makes sense for your commercial property.
Want to talk through whether SPF roofing fits your building? Call Roof Crafters at 775-200-9440 or visit roofcrafterswest.com to schedule a free inspection.