Crews from Jackson Contractor Group, JMS Crane and Rigging, and the manufacturer, Vector Foiltec, lifted a skylight into place on the roof of the new Billings Public Library on Saturday.
The elliptical dome, which measures approximately 20 by 30 feet and weights 4,500 pound, was manufactured in Germany and assembled on-site.
The dome is made up of three layers of Texlon, a flexible material that will be inflated with air from a compressor on the roof of the building.
Each translucent layer of Texlon has a different pattern, which will create a unique lighting effect on the inside of the building.
Vector Foiltec also used Texlon to create the National Aquatics Center for the 2008 Olympic Games in Beijing.