Support plate adapted for fitting into a photovoltaic panel and allowing the fixing and the integration of this panel onto a building roof, said plate comprising leaktight vertical overlap means, leaktight leteral fitting means adapted for cooperating with a neighboring plate, protruding studs for positioning the plate which are raised, characterized in that the plate comprises a central portion forming a hood which is deliminated by a front face designed to be arranged opposite the photovoltaic panel and a rear face, said hood comprising an aperture adapted for allowing the recovery of air interposed between the photovoltaic panel and the front face of the hood.