. Architect and engineer. LOS ANGELES CENTRAL LIBRARY B. G. Goodhue, Architect C. M. Winslow, Associate All flat roof surfaces covered with Irxsulex INSULATED ROOFS Roofs which permit upper floors to become uncomfortable inhot weather and permit an appreciable loss of heat in winter;roofs which permit moisture condensation on the undersideare obsolete. Modem building demands insulated structures. Insulex, per-manent, fireproof, lightweight, aerated gypsum, affords thearchitect the most efficient insulation yet devised—and themost economical. I. EMPIRE !i:S^ GYPSUM-AIRCELL-INSULATION

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