Editing Cornice (section)

====Box cornice====
[[File:Wide box cornice.jpg|thumb|A wide box cornice with lookouts]]
Box cornices enclose the cornice of the building with what is essentially a long, narrow box.  A box cornice may further be divided into either the ''narrow'' box cornice or the ''wide'' box cornice type.  A narrow box cornice is one in which "the projection of the rafter serves as a nailing surface for the soffit board as well as the fascia trim."<ref name=anderson/>{{rp|p.63}}  This is possible if the slope of the roof is fairly steep and the width of the eave relatively narrow.  A wide box cornice, a common practice on houses with gentle roof slopes and wide eaves, requires lookouts to support it and provide a surface to attach the soffits securely.  Box cornices often have ventilation screens laid over openings cut in the soffits to allow air to circulate within the cornice.