Steel Decking
CSI Division 05, Metals
Corrugated sheet steel panels installed across structural steel beams to form the base for a concrete floor or roof; the decking itself often also acts as a working platform for other trades before the concrete is poured on top of it.
Why it matters
Steel decking has to be properly welded or fastened to the structural steel beneath it before it can safely support workers, equipment, or a concrete pour: an unsecured or improperly attached deck is a serious fall hazard and can't reliably support the wet concrete poured on top of it.
On a real project
After structural steel beams are erected on a floor, a crew installs steel decking across them, welding it to the beams at the required spacing before electricians, plumbers, and other trades are allowed to use it as a working platform.
Who this matters most to
An Ironworker installs and welds steel decking into place. A Superintendent confirms decking is properly secured before allowing other trades onto a floor, since decking that looks installed can still be inadequately fastened underneath.
Where this goes wrong
A decking crew tack-welds panels in fewer locations than specified to move faster, and the shortfall isn't caught by inspection before other trades start working on the floor. Under the weight of workers and staged material, a panel shifts, creating both a fall hazard and a gap that has to be caught and corrected before the concrete pour can proceed.