. Asbestosteel for roofs and walls . A 8 B E S 1 O S T E E L BULLETIN N U >I B E R 5 4. large spans or heavy floor loads. Thenecessit^> for pouring shibs heavyenough for pavements, and supportingthem as roofs with heavy foundatiousand framework, no longer exists. Thedemand for self-reinforcing, light slabs, incorporating the use of a permanentmetal form, has resulted from appreciation of this fact. Heavy slabs must be poured with great loss of form lumber, and nopractical, removable sheet metal form has yet appeared. The known types of combined reinforcing and centering sheets fallshort
. Asbestosteel for roofs and walls . A 8 B E S 1 O S T E E L BULLETIN N U >I B E R 5 4. large spans or heavy floor loads. Thenecessit^> for pouring shibs heavyenough for pavements, and supportingthem as roofs with heavy foundatiousand framework, no longer exists. Thedemand for self-reinforcing, light slabs, incorporating the use of a permanentmetal form, has resulted from appreciation of this fact. Heavy slabs must be poured with great loss of form lumber, and nopractical, removable sheet metal form has yet appeared. The known types of combined reinforcing and centering sheets fallshort in their latter capacity, as they are not capable of carrying the wetconcrete on anything but short spans. As reinforcing metal they arefundamentally weak, because they are so thin that their destruction byrust is quickly accomplished, and rusting frecjuently connnences beforethev have been installed in the buildiu.
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