According to the present invention, there is disclosed panel member (110) for a wall structure (105) comprising a first surface (112) and a second surface (114) spaced from said first surface (112). At least one rib member (116) extending between said first surface (112) and said second surface (1 14), A first end member (120) and a second end member (122) is provided and each of the first end member (120) and the second end member (122) extending between the first surface (112) and the second surface (114), substantially parallel with the at least one rib member (116) so as to form at least two channels (118) between the first surface (112) and the second surface (114). The first end member (120) has a male connector member (ISO) extending therefrom and the second end member (122) has a lemale connector (152) formed therein. Ihe male connector member (150) and the female connector (152) are each configured to be complementary such that the male connector member (150) of the panel member is able to be received within a female connector (152) of an adjacent panel member (110) to facilitate connection of adjacent panel members (110) to form the wall structure (105).
