Flammable surfaces made of wood, such as floor and wall coverings, are only widely accepted as flame-retardant products. For appropriate product developments the cone calorimeter (ISO 5660-1, 2015) is an established laboratory fire testing device. For the necessary large-scale fire classifications, flame propagation along the surface (flame spread) is to be evaluated, which is not possible in the cone standard configuration. Therefore the qualification of a modified, so-called RIFT arrangement with flame spread burn in the cone calorimeter was investigated. An experimental program with products of several types of wood, thicknesses and surfaces was implemented in order to develop significant RIFT parameters for suitable fire classification prediction models. As a result, due to the substantive equivalence of the RIFT parameters, which were proven to be significant in the multiple linear regressions, and the corresponding classification parameters to be calculated, models with high predictive accuracy could be derived.