Abstract: Abstract: In order to explore the influence of glass fiber mesh on the fire hazard of XPS material, the pyrolysis characteristic parameters of the material XPS were measured by the thermogravimetric instrument, and the combustion characteristic parameters of XPS and the common 3 pore size glass fiber mesh composite layers were obtained by cone calorimeter, and the fire hazard degree of the insulation layer composite with different pore size glass fiber mesh was calculated by analytic hierarchy process. Experimental results show that the XPS material starts pyrolysis from 280 °C and reaches the maximum pyrolysis rate at 425 °C; adding the glass fiber mesh will promote the combustion reaction of XPS, the smaller the pore size of the XPS composite glass fiber mesh, the higher the amount of heat and flue gas released by combustion, and the greater the fire hazard. It is explained that the glass fiber mesh will exacerbate the fire hazard of XPS insulation materials, and the use of small pore fiber mesh should be reduced or avoided in the design of building exterior wall insulation.

Key words: Key words: fiberglass mesh, XPS, pyrolysis, combustion characteristics, analytic hierarchy process, fire hazard