A roof attachment flashing system for preventing water penetration when utilizing an L-foot to attach a structure to a roof. The roof attachment flashing system generally includes a flashing member which is adapted to be utilized to seal penetrations of a roof which are necessitated by the installation of an L-foot for securing a roof attachment such as solar panels to the roof. The flashing member includes a receiver member at its first end which includes a raised portion defining a slot on its lower surface that will sealably cover the horizontal portion of the L-foot. A mounting bracket extends upwardly from the receiver member for securing the flashing member to the vertical portion of the L-foot. When installed, the flashing member will prevent water from leaking into the roof through any penetrations into the roof caused by installation of the L-foot.