International audienceThe experience shows that roofing systems are to be considered as a major factor of the fire propagation in industrial buildings like warehouses. Currently in France, regulations require that two main measures be implemented to limit the propagation of the fire by the roof: one is thé use of intumescent strips on the roof; the other consists of extending the fire walls (typically 70 cm or 1 m) above the roof level in order to prevent the flame from being blown down onto roof top. A set of normalised-like live tests is used to study the behaviour of roofing systems submitted to interior or exterior fire. Unfortunately, the aforementioned measures are not easily modelled through live tests, and this prompted the need to develop an accurate computer modelling method. Therefore, this paper presents a computer modelling approach aiming at studying the influence of such intumescent strips or wall upstands on the heat propagation properties of current roofing materials. In this paper, two kinds of roofing Systems are studied: one containing stone wool as insulating material; the other containing polyurethane as insulating material. The numerical code used is Fire Dynamic Simulator12 (FDS), developed by the NIST, with a special additional heat conduction module
