Retractable roof

Type of roof that can retract The Johan Cruyff Arena in Amsterdam, with the retractable roof opened and closed A retractable roof is a roof system designed to roll back the roof of a structure so that the interior of the facility is open to the outdoors. Retractable roofs are sometimes referred to as operable roofs or retractable skylights. The term operable skylight, while quite similar, refers to a skylight that opens on a hinge, rather than on a track. Retractable roofs are used in residences, restaurants and bars, swim centres, arenas and stadiums, and other facilities wishing to provide protection from the elements, as well as the option of having an open roof during favourable weather. History The United States Patent and Trademark Office (USPTO) records show that David S. Miller, founder of Rollamatic Retractable Roofs, filed U.S. patent 3,277,619 in August 1963 for "a movable and remotely controllable roof section for houses and other types of buildings". Shapes and sizes While any shape is possible, common shapes are flat, ridge, hip-ridge, barrel and dome. A residence might incorporate one or more 3' by 5' retractables; a bar or restaurant a retractable roof measuring 20'