Wildfires are one of the most destructive environmental phenomena that can damage natural ecosystems, the animal world, and human settlements. The understanding of natural fires and their environmental impacts is crucial to the development of countries to combat them. Natural fires cover a wide range of scientific disciplines, including forest studies, ecology, meteorology, geography, geology, and others. Scientists study fire causes, distribution, impact on the landscape and the animal world, and also develop methods for forecasting and preventing fires. Experimental results of a modeled fire on wood structures are presented in this investigation. The modeling source of combustion was distinguished in three different forms: wood stacks, forest canopy, and liquid hydrocarbons (gasoline). In accordance with the type of combustion source, the thermal load on the wood sample varied. Data analysis shows the temperature changes on the surfaces of the studied structures as a result of the experiment. In accordance with the combustion source, heat flux assessments were conducted. A detailed analysis of the vertical combustion spread on the surface of wood building materials was conducted using the experimental setup presented in this paper. In open areas, changing wind conditions cause the combustion wave to propagate nonuniformly, the front to spread in the direction of the wind, and the front angle to change linearly throughout the combustion process. These results can be used to develop methods for testing building materials for fire hazards.