A structural panel assembly includes first and second structural panels. Each structural panel includes: a substrate; an elongated male joint member comprising an aluminum extrusion at a first longitudinal edge portion of the substrate, with the male joint member including a latch member including a curved portion that extends the length of the substrate; and an elongated female joint member including an aluminum extrusion at a second, opposite longitudinal edge portion of the substrate, with the female joint member including a curved channel that extends the length of the substrate. The curved channel of the female joint member of the first structural panel is sized and configured to receive the latch member of the male female joint member of the second structural panel with the first and second structural panels in a coupled position.