BLADE ASSEMBLY FOR A WIND TURBINE BLADE, WIND TURBINE BLADE AND METHOD FOR BUILDING A WIND TURBINE BLADE

A blade shell assembly for a wind turbine blade shell is described. The blade shell assembly includes a first element (200) having a first mating surface (201) and a second element (300) having a second mating surface (301). The first mating surface (201) and the second mating surface (301) are adapted for abutting on each other in an assembled state. The second element (300) includes one or more grooves (310) able to generate a spring effect to close a gap (450) between the first element (200) and the second element (300), the gap (450) extending substantially in a direction (402) substantially perpendicular to the second mating surface (301) or the first mating surface (201). Further, a method for building a blade shell of a wind turbine blade and a wind turbine blade are described.