“HOLLOW PROFILE DE OPEN SE??O AND STRUCTURAL FLAGSTONE CONSTRUìDA WITH a HORIZONTAL ARRANGEMENT OF the SAID PROFILES, a PLURALITY OF LOCATED BLOCKS OF ISOLATING MATERIAL BETWEEN the SAME ones, ONE THRESHES LOCATED ON SAME AND the CONCRETE THAT CONFERS RIGIDITY the SAID FLAGSTONE”. The invention mentions a metallic profile to it (1), or one another adjusted material, with appropriate structural characteristics for the construction, and a structural flagstone (6) that it uses the said profiles, which is capable to bonanza fill well the structural requirements and of isolation, a real estate project, and requires a significantly lesser amount of elements of al?aprema during its construction, involving low costs of acquisition of parts, have carried and installation in the workmanship. The section of the said profile (1) is hollow and opened in its superior part and its contour it is similar to a “inverted T”. The said structural flagstone (6) is constructed with a horizontal arrangement of the said profiles (1), a plurality of located blocks of isolating material (7) between the same ones, a metallic mesh (8), or one another adjusted material, located on same and a part of concrete (9) that it joins the too much parts of the structural flagstone (6) allowing that they work as a composed system.