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Elevated temperature curing increases the glass transition temperature of the polymeric bond between CFRP and steel. Fire performance of an elevated temperature cured and ambient temperature cured CFRP strengthened steel I beam was evaluated using a numerical model. The effects of a range of thicknesses and conductivities of insulation layers were also analyzed. Model results are in good agreement with the theoretical results. Insulation is a compulsory requirement for CFRP strengthened steel I sections. On average, a 35% increase in fire performance was noted at elevated temperature cured CFRP strengthened I beams compared to the ambient cured I beam.