ComFlor 225

ComFlor 225 is the latest addition to Corus Panels and Profiles' flooring range. Developed specifically for Corus Slimdek ® system, ComFlor 225 offers up to 6.5 metres unpropped span. Corus Slimdek engineered flooring solution is a unique structural floor system which uses asymmetric SlimFlor beams, where the bottom flange is wider than the top flange. The ComFlor 225 steel deck bears on the lower flange of the beam which results in a minimal overall floor depth, the concrete that surrounds the beam provides composite action without the need for shear studs and fire protection to the beam. The Slimdek system is fast, eliminates temporary props, is structurally optimised and saves on cladding costs. The system also reduces building height and enables extra floors to be built.

• ComFlor 225 deck is a state of the art cold formed profile design offering fully optimised composite and load carrying characteristics
• The re-entrant section to the top flange of the profile enhances composite action and offers easy services attachment
• The deck is designed to offer flexible service integration (as described in Steel Construction Institute publication 'Service Integration in Slimdek')
• Up to two hours fire rating with unprotected soffit

Volume & weight table notes

1. Deck and beam deflection (i.e. ponding is not allowed for in the table).
2. Deck and mesh weight is not included in the weight of concrete figures.
3. Density of concrete is taken as:
   •  Normal weight (wet) 2400 kg/m²
   •  Normal weight (dry) 2350 kg/m²
   •  Lightweight (wet) 1900 kg/m²
   •  Lightweight (dry) 1800 kg/m

Deck material
Zinc coated steel to BS EN 10147:1992, Fe E 350G, Z275, with a guaranteed minimum yield stress of 350 N/mm². Minimum zinc coating mass is 275 g/m² total including both sides.

Quick reference tables
The quick reference load/span and fire design tables, on the following 2 pages are intended as a guide for initial design, based on the parameters stated below the tables. The Corus PMF calculation suite contained on the CD at the back of this literature provides a full design program. The CD can be ordered by contacting the Construction Technical Hotline.

Anti-crack mesh
BS 5950: Part 4 currently recommends that anti-crack mesh should comprise 0.1% of slab area. The Eurocode 4 recommendation is that anti-crack mesh should comprise 0.2% of slab area for unpropped spans and 0.4% of slab area for propped spans. Corus Panels and Profiles' in conjunction with The Steel Construction Institute has agreed to modify the requirement with regard to anti-crack mesh, to comply with the Eurocode 4 recommendations. Accordingly, the mesh shown in the quick reference tables complies with EC4 and the design program defaults to these values. Where EC4 mesh rules are used, the mesh may be reduced midspan. The reduced British Standard mesh values may still be used by overriding this default in the design program. Mesh top cover must be a minimum of 15 mm, and a maximum of 30 mm. Mesh laps are to be 300 mm for A142 mesh and 400 mm for A193, A252 & A393 mesh.

Fire
For details of the performance of composite slabs under a fire condition with nominal anti-crack mesh, please refer to the quick reference fire load tables. For other simplified design cases or for full fire engineering, refer to the design CD, please contact us for a copy of the CD.

Technical services
Corus Panels and Profiles Technical Department offer a comprehensive advisory service on design of composite flooring, which is available to all specifiers and users. Should queries arise which are not covered by this literature or by the design CD, please contact us.