. Cyclopedia of architecture, carpentry, and building : a general reference work. idered the covering ofthe steel skeleton from the point of obtaining an available floor surface,and the necessary housing in by means of the exterior walls. Whilethese elements are also made to serve their turn in protecting theframe from fire and the elements, further and complete protectionfrom fire be considered as of prime importance. Columns. Especially is this true in the case of the columns,which necessarily sustain a great weight, and should therefore beadequately protected. Columns may be enclosed
. Cyclopedia of architecture, carpentry, and building : a general reference work. idered the covering ofthe steel skeleton from the point of obtaining an available floor surface,and the necessary housing in by means of the exterior walls. Whilethese elements are also made to serve their turn in protecting theframe from fire and the elements, further and complete protectionfrom fire be considered as of prime importance. Columns. Especially is this true in the case of the columns,which necessarily sustain a great weight, and should therefore beadequately protected. Columns may be enclosed in brick, whichshould be not less than eight inches thick, or hollow terra-cotta tilesmay be used, preferably in two layers, each not less than two inches 193 184 BUILDING SUPEKINTENDENCE thick and breaking joints. (Fig. 232.) Columns may also be pro-tected by the use of metal lathing and plaster in one or two layerswith an air space between. (Fig. 233.) Girders. While the floor beams and flush girders are pro-tected normally by the floor or ceiling construction, girders which.
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