non overriding structure the screw does not rotate to lower the step 25 when weight is applied to the step override is prevented by employing a screw having a diameter of about 0 75 inches and having about 12 threads per inch to turn the screw and thereby actuate the toggle mechanism a handle 75 of conventional construction may be permantently attached to the lower end of the screw by suitable means such as a pin not shown one of the features of the present invention is that it is readily transportable for that purpose the base 7 step 25 connecting links 43 and 47 bearing supports 69 and bearing block 63 are preferrably fabricated from aluminum to further enhance portability the support walls 14 may be constructed with generally oval openings 79 the openings serve as hand holds and they may be sized to accomodate a mittened hand for ease of storage as well as transportation the platform fully folds so that the base and the step lie in parallel side by side relationship as shown in fig3 as a result of the ease with which the instant roof platform may be carried it is anticipated that a fire fighter can easily carry it to a roof on the first response normally a second fire fighter would carry and set up the roof ladder to use the adjustable roof platform of the present invention it will be assumed.