Welcome to the next generation of building designs. AllGal Garages and the Williams River Steel Group are proud to bring you The Curved Roof Range. Constructed from a 1.2mm steel stud wall frame @ 600mm centres and C section roof purlins, the Curved roof design is ready to be fitted with nearly any internal lining. Custom Orb sheeting is standard on the roof and walls, with alternative wall claddings available.