Exterior Facade Keystone

An exterior facade keystone is a polyurethane facade element placed at the crown of an arch to accentuate the opening. It is used as a central accent above arched and flat opening tops; when applied together with a surround and arch, it gives the opening a focal point. The polyurethane material is lightweight, which makes installation at height easier; it resists moisture, frost and impact, does not crack or blister, and can be painted with exterior facade paint. Being lighter than plaster or stone, it adds no extra load to the facade and goes up quickly with mounting adhesive. Because each piece is cast from a mould, the profile and relief detail repeat identically. Polure produces the exterior facade keystone in various sizes and patterns.