. Asbestosteel for roofs and walls . y. This part of the operation can be more quickly and moreeasily executed than the erection of an ordinary corrugated steel roof, andthe result is infinitely more satisfactory. The sheets ai*e furnished in lengths up to twelve feet. A purlin spac-ing of four feet is recommended. Spans up to ten feet may be used,although spans over five feet usualh- require temporary shoring duringconstruction. (See table on page 20.) Having completed the Asbestos Protected Metal roof, the concrete orcement mortar, reinforced if required, can be laid on whenever it is con-ve
. Asbestosteel for roofs and walls . y. This part of the operation can be more quickly and moreeasily executed than the erection of an ordinary corrugated steel roof, andthe result is infinitely more satisfactory. The sheets ai*e furnished in lengths up to twelve feet. A purlin spac-ing of four feet is recommended. Spans up to ten feet may be used,although spans over five feet usualh- require temporary shoring duringconstruction. (See table on page 20.) Having completed the Asbestos Protected Metal roof, the concrete orcement mortar, reinforced if required, can be laid on whenever it is con-venient. This completes the Asbestosteel construction, on top of which anydesired waterproof co^ering may be applied. The underside requires noback-plastering, because the Asbestos Protected Metal needs no protectionfrom corrosion and without further treatment gives a fine ceiling finish. Reinforcing steel fabric or rods may or may not be used, according tothe wishes of the engineer. It is not necessary for strength, except in case of. NEW YORK EDISON COMPANY POWER PLANT. NEW YORK Metropolitan power house construction demands the use of the best and most permanent materials and equipment
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