Abstract: The present invention provides a flashing system for roof mounting equipment which reliably prevents water from reaching the substructure of the roof. The flashing system comprises a flashing plate having upper and lower surfaces, and at least one hole extending therethrough for receiving a fastener. A first seal is arranged at the lower surface of the flashing plate, and a second seal is arranged at the lower surface of the flashing plate surrounding the first seal, wherein the thickness of the first seal is greater than the thickness of the second seal. The thickness relation is provided when the flashing system is installed and both seals are compressed. A third seal, which receives the fastener therethrough, can be provided at the upper surface of the flashing plate.