The hollow sections 12, 14 of the corner joint 10 comprise a front (24, figure 5a) and rear wall 28 coupled through an inner (30 figure 5a) and outer (32, figure 5b) wall, wherein the first profile section has a first end portion in which the inner and outer walls are cut off transversely leaving the front wall standing proud to form a front tongue 56 having a longitudinal edge 55. The second profile section has a second end portion which is cut of transversely such that the front wall is cut off inboard of the second end portion to form a transverse front edge 68 and either of the end portions comprise a rear wall which stands proud to form a rear tongue 58 having a longitudinal edge 59 with the other end section the rear wall is cut off to form a transverse rear edge 63. The corner joint further comprises a jointing piece receivable in the first and second profile sections to form the joint such that the front and rear tongues extend across the joint and the longitudinal and transverse edges of the front and rear walls adjoin one another.
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