Testing Spray Foam as Thermal Insulator

Can you really insulate a dome with spray foam? I'm putting spray foam insulation to the ultimate DIY test - the underside of my dome. In this real-world experiment, I evaluate whether modern spray foam insulation can truly deliver maximum thermal performance, energy efficiency, and long-term durability for an off-grid, self-sufficient homestead. This is more than a build test, it’s about resilience, preparedness, and true independence. We’re breaking down real results to answer one critical question: Can spray foam insulation provide the protection and performance required for off-grid living in extreme conditions?