Decorative Foam Exterior Cornices are used to decorate the roofing of the house – the overhang of the roof. The cornice is one of the most important architectural elements of the facade. The shape, dimensions, and configuration of the under-roof cornice make the most important impression on the external decor of the walls of the house. Each style has its shape and configuration of the cornice. The roof element can be either single or composite of several parts. The selection of the shape and dimensions of the under-roof cornice is the most important stage in the design of the facade of the house.