An assembly of building blocks of the type comprising parallelepiped bodies having interior cells and at least a first face and a second face for coupling between blocks, with a first base block (1, 11, 101, 111) having at least two sections (4, 5; 12, 13) of different height forming a stepped body, in the form of two steps, characterized by at least one intermediate cell (36, 38, 39) that separates said sections (4, 5; 12, 13) from each other and defines a clearance (37, 40, 41) between vertical protrusions of said sections, a second interleaving block (19, 119) having at least two sections (22, 23) of different length forming a lying "T"-shaped body, so that the wings (24, 124) of the "T" are arranged vertically and the mast (25, 125) of the "T" is arranged horizontally, wherein the wings (24, 124) of the "T" have a vertical length and the mast (25, 125) of the "T" has a vertical width and an horizontal length, and the vertical length of the wings are longer than the vertical width of the mast and longer than the horizontal length of the mast (25, 125), at least one intermediate cell, in the second interleaving block, that separates said sections (22, 23) of the second interleaving block from each other and defines a clearance between vertical protrusions of said sections (22, 23), said at least one intermediate cell having a vertical length that is shorter than said vertical width of the mast (25, 125), wherein said clearance (37, 40, 41) defined by the at least one intermediate cell (36, 38, 39) of the first base block (1, 11) and said clearance defined by the at least one intermediate cell of the second interleaving block form an air chamber (44, 45) when both, the first base block (1, 11) and the second interleaving block are coupled to each other, and wherein the air chamber (44, 45) forms a thermal barrier by interrupting any continuity of the coupling between said first (109, 110) and second (132, 133) faces of said blocks. a first base block (1, 11, 101, 111) having at least two sections (4, 5; 12, 13) of different height forming a stepped body, in the form of two steps, characterized by at least one intermediate cell (36, 38, 39) that separates said sections (4, 5; 12, 13) from each other and defines a clearance (37, 40, 41) between vertical protrusions of said sections, a second interleaving block (19, 119) having at least two sections (22, 23) of different length forming a lying "T"-shaped body, so that the wings (24, 124) of the "T" are arranged vertically and the mast (25, 125) of the "T" is arranged horizontally, wherein the wings (24, 124) of the "T" have a vertical length and the mast (25, 125) of the "T" has a vertical width and an horizontal length, and the vertical length of the wings are longer than the vertical width of the mast and longer than the horizontal length of the mast (25, 125), at least one intermediate cell, in the second interleaving block, that separates said sections (22, 23) of the second interleaving block from each other and defines a clearance between vertical protrusions of said sections (22, 23), said at least one intermediate cell having a vertical length that is shorter than said vertical width of the mast (25, 125), wherein said clearance (37, 40, 41) defined by the at least one intermediate cell (36, 38, 39) of the first base block (1, 11) and said clearance defined by the at least one intermediate cell of the second interleaving block form an air chamber (44, 45) when both, the first base block (1, 11) and the second interleaving block are coupled to each other, and wherein the air chamber (44, 45) forms a thermal barrier by interrupting any continuity of the coupling between said first (109, 110) and second (132, 133) faces of said blocks.