 Alday was also concerned with the building of new churches in South America, including the third church built in the Marian sanctuary of Andacollo as well as the completion and consecration of the principal church in Mendoza, Argentina, in 1760.Alday founded new parishes as he traveled across his extensive diocese, visiting, for example, Copiapó and Cuyo.He founded San Lázaro (1775) in the suburbs of Santiago, and parishes in more distant areas, such as Paredones (1765), Combarbalá (1757), Pelarco (1787) and Renca (1764).