In this paper the conservation issues related to the reinforced concrete structure of the Stadio Flaminio in Rome, by Pier Luigi and Antonio Nervi, are addressed. The restoration of modern architectural heritage and, in particular, of concrete surfaces, represent a very topical subject, given the richness of this repertoire and the recognition of inherent historical artistic and testimonial value by contemporary architectural culture. The gaps—caused by phenomena of carbonation with oxidation of the reinforcement bars and consequent expulsion of the concrete cover—are found in the great presence at the intrados of the roof covering the west Grandstand, in the attachment portions of the underlying frames, and in almost all the frames near the prefabricated tiles (areas subject to infiltration, runoff and stagnation of rainwater).