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Improved corrugated steel decking of the type having plural crest surfaces, plural valley surfaces and plural sloping web surfaces connecting each crest surface to the adjoining valley surface. An inwardly depressed groove is provided in each of the sloping web surfaces adjacent to the crest surface

Improved corrugated steel decking of the type having plural crest surfaces, plural valley surfaces and plural sloping web surfaces connecting each crest surface to the adjoining valley surface. An inwardly depressed groove is provided in each of the sloping web surfaces adjacent to the crest surface.

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In a steel floor decking section comprising a profiled steel sheet having plural crest surfaces in a common crest plane, plural valley surfaces in a common valley plane and sloping web surfaces connecting each said crest surface to the adjoining valley surface, whereby each said crest surface and it

In a steel floor decking section comprising a profiled steel sheet having plural crest surfaces in a common crest plane, plural valley surfaces in a common valley plane and sloping web surfaces connecting each said crest surface to the adjoining valley surface, whereby each said crest surface and its contiguous sloping web surfaces form a raised flute, the said crest surfaces being a width greater than the spacing between the said crest plane and the said valley plane; lateral connecting means disposed along each of the outer ones of said valley surfaces of said decking section; the improvement comprising a lengthwise groove which is uninterrupted for the length of the decking section and enters beneath the said crest surface in each of the said sloping web surfaces adjacent the top of said raised flute, wherein a flat plane which includes the said sloping surface intersects the said crest plane at or outside the adjacent side edge of the crest.