FIRE SPREAD MECHANISM ON SURFACE OF CONSTRUCTION FIT WITH FAÇADE HEAT INSULATION BASED ON COMBUSTIBLE INSULANT AND FINISHED WITH PLASTER

The article is dedicated to the use of structures of external walls with facade insulation with plaster, which is widespread and popular in our country and abroad, as well as the problems associated with their fire hazard. The work of domestic and foreign researchers dealing with fire safety issues of facade systems has been analyzed. Classification of prefabricated systems of facade insulation is performed depending on the design decision, as well as on the main features in accordance with: the type of applied insulation material; a method of fastening a heat-insulating layer; composition of the base plaster layer; kind of decorative protective layer. The structure of prefabricated systems with complete sets of insulation with prefabrication of light, thick-layer plaster or fine-wares products is represented. The peculiarities of the processes that occur during combustion of the thermal insulation and finishing system of the outer walls of residential buildings are analyzed and revealed. Typical scenarios of fire spreading are presented with a surface of the design of external walls with a facade heat insulation with a fuel heater and a stucco coating. The mechanism of propagation of fire through a window opening by a surface of a facade heat insulation on the basis of foam polystyrene is described. The conclusion is made that the use of structures of exterior walls of residential buildings with facade insulation with combustible insulant and stucco coating significantly increases their level of fire hazard. This danger will depend on both the properties of individual materials (including insulant), as well as on the design features of the entire thermal insulation system and the building as a whole. For plaster systems, the thermal insulation of facades is a major threat to the rapid spread of fires on the floors above and below the building. The most common causes of thermal insulation fires is the transfer of fire from the windows during intense fire inside the rooms.