A curtain wall is a glazed wall system hung off a concrete slab using anchors. Curtain walls are self-supporting and give a building’s exterior the look of top to bottom glass. Most often used on commercial buildings, curtain walls are typically installed from the outside of a building using cranes or rigs. Curtain wall installation is a complex process and can be more expensive than storefront systems.? It differs from Storefront in that curtain walls are designed to span multiple levels of a building.