The right system depends on climate zone, building use, and budget. Closed-cell spray foam delivers the highest performance per inch and eliminates condensation risk, making it the strongest choice for cold climates. Fiberglass batt with a properly installed vapor barrier is the most cost-effective option for agricultural and workshop builds. Insulated metal panels represent the highest-performance option for commercial and industrial facilities. Most high-performance Canadian steel building assemblies combine two system types , typically cavity insulation with a continuous rigid board layer to address thermal bridging.