An internal splice joint that facilitates coupling of a pair of joist members together is provided. The internal splice joint includes a main wall, first and second side flanges, and first and second end flanges. The first side flange extends upwardly from the main wall. The second side flange extends upwardly from the main wall and is spaced from the second side flange. The first end flange extends from the first side flange. The second end flange extends from the second side flange. The first end flange and the second end flange extend inwardly towards each other and are spaced from each another. A joist assembly that includes the internal splice joint is also provided.