NOVELTY - The apparatus has a second metal section (2) having a longitudinal step (22) which is engaged against a lower horizontal border (BI) of a solar module (M). An upper section of vertical bearing wall of second metal section is engaged against a front side of solar module. The second metal section does not cover the holes of the two first metal sections. An upper horizontal border of the following solar module is inserted into overturned-U shaped housing (206) of the second metal section fixed to the lower horizontal border of the solar module in upper position when mounted on the solar panel.    USE - Modular apparatus for architectural integration of frameless solar modules provided with rectangular shape.    ADVANTAGE - Minimizes the visual impact generated by the solar installation and protects the solar module against impact during handling operations for storage, transportation and final installation in the building site since the upper horizontal border of the following solar module is inserted into an overturned-U shaped housing of the second metal section fixed to the lower horizontal border of the solar module in upper position when mounted on the solar panel. Protects the borders of the solar module against penetration of humidity and other weather agents, and prevents the rear side of the solar module from sliding, with respect to the wood strips, due to the thermal expansion and mechanical stress by using a metal structure which acts as a frame. Provides easy coupling between the solar module and the solar module in immediately lower position to guarantee the tile effect that avoids rainwater penetration between the two modules since the second metal section is mounted on the lower horizontal border of the solar module. Protects the lower horizontal border of the module against humidity and other weather agents since the second metal section provides mechanical resistance to the solar module. Provides a practical and reliable roof covering structure which is formed of parallel vertical rows of modules by providing the metal open frame in each laminate solar module.    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of the second metal section in operating position between the two solar modules.    Second metal section (2)    Longitudinal step (22)    Housing (206)    Lower horizontal border (BI)    Solar module (M)