Illinois Society of Architects · Chicago · leaf 253
re In thickness, theymay be considered as a portion of the thick-ness required for the surrounding walls.The walls surrounding chimneys having anarea greater than four hundred squareinches shall have an insulating cavity notless than three inches wide surrounding theinner four inches of fire brick… … 1IH v/y//, Wfc c A w In
Architecture · Building · Architects
Internet Archive · University of Illinois Urbana-Champaign · Public Domain Mark 1.0. Free to use for anything.
