Abstract: A solar-collector roofing assembly (10) comprises a plurality of elongate spaced-apart primary support members (12) aligned in a horizontal plane and extending in a first direction A; a plurality of elongate spaced-apart secondary support members (14) having first and second end portions (38, 40) connected to corresponding said primary support members (12), first and second end portions (38, 40) on a respective primary support member (12) being vertically offset relative to each other; and at least one solar-energy collector panel (16) directly or indirectly supported by the secondary support members (14) so as to have a predetermined fall towards an associated primary support member (12).