The disertation thesis is devoted to progressive method of determining the fire-technical characteristics of the materials in the fire engineering. As a progressive methods we chose chemical - analytical laboratory methods - simultaneous thermal analysis performed on the equipment NETZSCH STA 449 F3 at the set temperature program from 25 °C to 800 °C with the heating rate of the sample 10 °C∙min-1 in an inert nitrogenous atmosphere and method of the cone calorimeter performed at the calorimeter company FTT - Fire Testing Technology at a heat flux of 30 kW∙m-2. As a samples, we selected basic building materials - spruce (Picea abies (L.) Karst) and beech (Fagus sylvatica L.) in the original condition and as a retarded wood, polyurethane foams Normal and flame retardant treatment Deflamo and polystyrene Polyform. In the method of the cone calorimeter, we have mainly focused on on time-dependent variables parameters of fire - heat release rate (HRR), total heat release (THR), time of ignition, mass loss, smoke production rate and the production of CO and CO2. Simultaneous thermal analysis include the thermogravimetric analysis, the derivative thermogravimetric analysis and the differential scanning calorimetry, where we focused on the mass loss in the time, the temperature at the various stage of decomposition of material and reaction enthalpy with individual temperature range. Summarization and mutual combination of obtained data receive a comprehensive fire-technical characteristics of the examined material. Graphical results of thermal analysis and cone calorimeter confirmed a two stage thermal decomposition of wood and polyurethane foam, polystyrene thermal decomposition was carried out in one stage. The effects of the fire retardant coating of dihydrogen phosphate was demonstrated in the case of spruce wood, Polyurethane foam with fire retarding treatment showed compared to a standard foam the lower value of HRR and lower mass loss. In the case of beech wood, the effect of fire retardant was in the minimum level. In compared to other previously used standardized or non-standardized methods, the method of cone calorimeter and thermal analysis provides from one measurement the maximum output of fire-technical characteristics of the examined material.