What happens if foam is sprayed onto surfaces that are not between 60°F and 80°F?
Surfaces that are colder will result in reduced yield. This is caused by the cold surface extracting the heat from the exothermic reaction resulting in a reduced rise, thus a reduced yield. Cold surfaces can also affect adhesion because the cold robs the heat from the chemical reaction. Using test patches, patience, and even a thermal scanner (around $50) can help your cold weather foaming go smoothly. By making sure that the foam really bonds to the surface, you create a seamless air barrier that protects your home for years to come. If the surface is cold, there may also be condensation, which would be like spraying foam onto a wet surface. Therefore, the foam may not adhere to the surface. The only way to determine if this will happen is to do a test patch. If the foam sticks to the cold surface, spray the least thickness possible to simply raise the surface temperature to a level that would be closer to ideal temperatures. Allow that layer to cure. Then add the desired thickness to
