Method for vertical casting of an intermediate product having a final height H F in the casting direction, comprising the steps of (a) preparing at least two aluminium-based alloys namely a first alloy having a composition P and a second alloy having a composition T, (b) casting said first alloy having a composition P to a desired height H P, (c) casting a desired additional height H T of said second alloy in such a way as to reach a cast height H P + H T that is less than or equal to H F, and in such a way as to generate a "transition zone" Z having an intermediate composition between the two successively cast alloys, and wherein (i) the preparation of said aluminium-based alloys is carried out independently, or wherein (ii) the preparation of the aluminium alloys having a composition different than P is carried out starting from said first alloy during the casting by adding to said first alloy the necessary quantities of elements to reach the composition of said alloys having a composition different than P, or wherein (iii) the preparation of said at least two aluminium-based alloys is carried out during the casting starting from an aluminium-based alloy having a composition B, by adding to said alloy having a composition B the necessary quantities of elements to reach the composition of said at least two aluminium-based alloys P and T. (a) preparing at least two aluminium-based alloys namely a first alloy having a composition P and a second alloy having a composition T, (b) casting said first alloy having a composition P to a desired height H P, (c) casting a desired additional height H T of said second alloy in such a way as to reach a cast height H P + H T that is less than or equal to H F, and in such a way as to generate a "transition zone" Z having an intermediate composition between the two successively cast alloys, and wherein (i) the preparation of said aluminium-based alloys is carried out independently, or wherein (ii) the preparation of the aluminium alloys having a composition different than P is carried out starting from said first alloy during the casting by adding to said first alloy the necessary quantities of elements to reach the composition of said alloys having a composition different than P, or wherein (iii) the preparation of said at least two aluminium-based alloys is carried out during the casting starting from an aluminium-based alloy having a composition B, by adding to said alloy having a composition B the necessary quantities of elements to reach the composition of said at least two aluminium-based alloys P and T. (i) the preparation of said aluminium-based alloys is carried out independently, or wherein (ii) the preparation of the aluminium alloys having a composition different than P is carried out starting from said first alloy during the casting by adding to said first alloy the necessary quantities of elements to reach the composition of said alloys having a composition different than P, or wherein (iii) the preparation of said at least two aluminium-based alloys is carried out during the casting starting from an aluminium-based alloy having a composition B, by adding to said alloy having a composition B the necessary quantities of elements to reach the composition of said at least two aluminium-based alloys P and T.