In this paper problems which arose in the restoration carried out on two Roman bath complexes, the Baths of Cotilia and the Baths of Tito Flavio, which are located in the region of Sabina (Lazio, Italy), are presented. The restoration works, Carried out under the auspices of the Soprintendenza Archeologica per il Lazio , concerned the consolidation of the masonry structures (the initial masonry in opus coementicium and the masonry facing in opus incertum and vittatum) of the two complexes and some minor masonry reintegration in addition to being in ruins. The philosophy followed for both interventions has been that of conforming as much as possible to traditional methods and techniques in so much as advised by the recommendations of the Comitato Italiano per la Prevenzione del Patrimonio Culturale dal Rischia Sismico and by the 1987 Carta Italiana del Restauro . The extensive insertion of untested modern materials having little compatibility with the antique structures has been avoided.