What's the Difference between Stucco and EIFS and Fiber Cement Siding? Stucco is a mixture of cement, sand, water and lime which is applied in at least three layers to a surface with a trowel. It can be applied to almost any rigid surface, for example, poured in place concrete, masonry and plywood. EIFS is an acronym for Exterior Insulation and Finish System. It is also known as synthetic stucco. It is a layered application. Mesh, troweled on base coats and an acrylic top coat over insulating foam board.