Smoke effects can be generated by using a fixed smoke generator – Vollmer, Faller and Seuthe manufacture units of various kinds. One of these units may helpful if you want to create a simulated fire scene in a house or building.
You can begin by making a rough hole in the roof and have some charred burnt visible boards visible as though they are ready to collapse. Areas surrounding the hole and above the windows etc., can be airbrushed with a flat dirty black paint-wash to simulate the soot. It is usually best to paint the complete interior of the building flat black, so the fire won’t show through the walls, as this could look unrealistic.The smoke generator and flickering lights and sound effects can bring the scene to life.