Illinois Society of Architects · Chicago · leaf 198
cabinet, chase or anyother recess, shall encroach on the mini-mum thickness required for any fireproofcovering on structural metal, except as pro-vided in this chapter. If the depth of anycut-out box, switch box, cabinet, or chase,or if any other recess is to be concealed, orpartially concealed,… … (b) The least thickness of a hollow tileor porous terra cotta segmental arch shallbe one-half of an inch per foot of span, butno such hollow tile or terra cotta arch shallbe of a thickness less than five inches. (c) Both fiat and segmental arches shallbe so constructed that the joints of the…
Architecture · Building · Architects
Internet Archive · University of Illinois Urbana-Champaign · Public Domain Mark 1.0. Free to use for anything.
