It's that time of year when cooler temperatures can affect the performance of your spray foam kit. Spray foam is not exactly cheap, so you want to make sure you properly care for your kit and get the best yield and use out of it. Always check with the spray foam manufacturer for optimal material storage and use temperatures for the system you are using. Protect material from freezing which can happen during shipping, storage, or in the field.
If you are using a portable polyurethane spray foam kit, such as a Versi-Foam System, in cold temperatures and the foam is dark in color and has a crunchy surface the kit is operating off-ratio. You should always be running on a one to one ratio with two chemical streams of equal velocity. In cold temperatures, you will see more "A" chemical (darker chemical) dispensing than "B" chemical.
For peak performance of your spray foam kit in cold weather, here are a few helpful reminders:
Never store Versi-Foam or other portable spray foam kits in temperatures less than 40 degrees Fahrenheit. Storing at these temperatures would cause the chemicals to freeze. The "A" component would freeze and crystallize, creating blockages in the dispenser. If this does occur, it cannot be fixed.
Before use always warm the chemicals to a temperature between 65-90 degrees Fahrenheit. Check the temperature sensing strip on the tanks to be sure it is well into the green zone. It is also important during application, to continue to monitor the temperature of your chemicals. If it begins to move toward the blue zone, warm the chemicals again. If you've warmed the chemicals artificially, be sure to shake them well before using to make sure that the temperature is uniform throughout the tanks. Cold chemicals will result in a foam that is "A" rich which will be darker in color and have a crunchy surface.
For best yield, it is recommended that the surface temperature onto which the foam is being applied to be within 65-90 degrees Fahrenheit. Colder surface temperatures will result in a lesser yield and possible adhesion problems.