Closed Rib Floor Deck

Closed rib floor deck uses a re-entrant, dovetail rib geometry that closes the top of each rib — so the concrete sits in a flat-topped trough instead of an open channel. Against an open profile of the same depth, closed deck gives a smoother soffit, better fire performance from the enclosed rib, and lower concrete consumption because the ribs displace less concrete while still developing full composite action through their embossed sides.

Our closed profiles are roll-formed from G550 high-strength galvanized coil at Z275 (275 g/m²) minimum, with Z350 available for coastal and high-humidity sites. Standard effective widths of 688–915 mm cover the common 1,200 mm and 1,500 mm structural bay grids with minimal trimming waste.

Closed deck is the default specification for UK, Irish and Gulf projects where the soffit stays exposed or where a 60–120 minute fire rating must be met without added fire protection. Sheets are cut to length up to 13.5 m, match-marked and bundled by floor level for direct crane lift.

If your project is better served by the more widely available open profile, or by a concrete-free dry deck, both systems are manufactured in the same factory and can ship in one container — see the other deck systems linked below.