What is the difference between foam adhesive and foam insulation?
Foam adhesive only serves as a binding agent for roofing material, which works as a weather-resistant bond to help prevent leaks and other weather issues.
In contrast, foam insulation does not provide weather resistance — merely heat and cold resistance. You’ll save on your heating and cooling bill with foam insulation, but you’ll save on water damage and the need for costly repairs with foam adhesive glue.