Double up! Home > Projects > Double up! What a cover up 🙂 Car protection — rain hail or shine. This Double-U® double carport has made the world of difference for this customer. Our exclusive Double-U® roofing profile features high tensile Aluzinc® coated steel which provides you with outstanding strength and quality. In fact, the exclusive roof shape and design makes it the strongest and most rigid profile in the home additions industry. Double-U® is manufactured by Spanline here in Australia, so we know it’s a quality product. Spanline is Australian owned and operated, so not only are you buying a quality product; you’re helping to keep business local. Contact your local Spanline team today to enquire about the best solution for your home addition plans. Want to learn more about the Spanline difference? Contact us today