A one-dimensional, steady-state model is developed which predicts the behavior of a fire-protection foam exposed to radiant heating. Foam evaporation rate, energy balance, and temperature distribution within the foam are calculated for a given radiant heat input and foam expansion ratio. Results indicate that the energy balance is dominated by heat absorption and evaporation, The model is compared to experimental data from foam samples exposed to heat input from gas-fired panels. Measured and calculated temperature profiles are in good agreement. Dimensionless results remove the dependence on heating rate and collapse the temperature gradient in the bulk of the foam layer to a single value.