observing the measurement taken during this test the following conclusions can be made it can be concluded that the use of a membrane of one millimeter thickness applied directly behind the gypsum board allows slowing down the time of failure by 23 minutes which is equivalent to slowing it down by 50 when comparing it to the measurement taken for the area of the unprotected gypsum board in order to directly visualize the protective effect to the fire of the vapor barrier made with laminates of intumescent self adhesive inorganic fire resistant putty a wall assembly as shown in fig5 was constructed for a test made up of two stiles of radiata pine 28 on to which two laminates 32 33 of the inorganic intumescent putty of 1 5 millimeters of thickness were placed the outer side not exposed to the fire was covered with an osb board 29 and the inner side exposed to the fire was covered with a gypsum board 30 filling up the interior with fiberglass insulation 31 of 10 centimeters thickness in the center of this structural assembly a gas powered blowtorch flamethrower was placed at 30 centimeters distance after a few minutes the gypsum board disintegrated exposing the flame directly on to the intumescent inorganic putty laminate which then lasted for over six hours without any destruction or flame spread 1 gypsum board 2 polyethylene vapor barrier of 0 5 mm thickness 3 wooden stile of 2 5 cm thickness and 5 centimeters width 4 termo acoustic insulation fibre glass of 2 5 cm thickness 5 phenolic slanting wood.