It is a joinery system formed by connecting interior and exterior aluminum profiles with an insulating profile in order to provide thermal insulation. This insulating profile can optionally be used as domestic or imported (polyamide). Due to its aluminum structure, it is a material with a high thermal conductivity coefficient. Polyamide, on the other hand, is a material that can be produced sensitively with low tolerances, with an extremely low heat transmission coefficient, and a very high strength and hardness. Due to these properties, it is a suitable material that can be used in the insulation of aluminum systems.