ComFlor® 100

ComFlor® 100, has a very strong profile shape and offers the capability to span up to 4.5 metres without props. Designed particularly for continental european application, the ComFlor® 100 also brings considerable benefits to the British designer looking for longer unpropped spans. The profile is not suitable for use with shear stud connectors.

No temporary props
ComFlor® 100 can carry wet concrete and construction loads to 4.5 metres without temporary propping, depending on slab depth, thereby leaving a clear area beneath the floor under construction. Further savings of labour and prop hire are also realised.

Large concrete volume reduction
Although a deep slab is required, the ComFlor® 100 profile greatly reduces the volume of concrete needed and thus the cost and weight of concrete.

Suitable for traditional construction
ComFlor® 100 is suitable to be placed onto masonry walls or standard design non-composite steel beams.

Design information

ComFlor® 100 composite slab – volume and weight
Weight of concrete (kN/m2)
Normal weight concrete Lightweight concrete
Slab depth (mm) Concrete volume (m3/m2) Wet Dry Wet Dry
160 0.100 2.36 2.31 1.87 1.77
170 0.110 2.59 2.54 2.05 1.94
180 0.120 2.83 2.77 2.24 2.12
190 0.130 3.06 3.00 2.43 2.30
195 0.135 3.18 3.12 2.52 2.39
200 0.140 3.30 3.23 2.61 2.47
210 0.150 3.53 3.46 2.80 2.65
220 0.160 3.77 3.69 2.98 2.83
230 0.170 4.01 3.92 3.17 3.00
250 0.190 4.48 4.38 3.54 3.36


Volume and 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/m3
  • Normal weight (dry) 2350 kg/m3
  • Lightweight (wet) 1900 kg/m3
  • Lightweight (dry) 1800 kg/m3

ComFlor® 100 is not designed for use with shear studs (i.e. not for composite beam design).

Section properties (per metre width)
Nominal thickness (mm) Design thickness (mm) Profile weight (kN/m2) Area of steel (mm2/m) Height to neutral axis (mm) Moment of inertia (cm4/m) Ultimate moment capacity (kNm/m)
Sagging Hogging
1.00 0.96 0.14 1687 58.00 257.0 11.84 14.96
1.10 1.06 0.15 1855 58.00 278.0 12.08 16.80
1.20 1.16 0.16 2022 58.00 298.0 12.40 18.64


Decking material
Corus Galvatite, hot dip zinc coated steel EN 10326-S280GD+Z275. Guaranteed minimum yield stress 350N/mm2. Minimum zinc coating mass 275g/m2 total both sides.

Quick reference tables
The quick reference load/span and fire design tables,in the ComFlor® manual are intended as a guide for initial design, based on the parameters stated below the tables.

Full design can be carried out using the free Comdek software.

Anti-crack mesh
BS 5950: Part 4 currently recommends that anticrack mesh should comprise 0.1% of slab area. The Eurocode 4 recommendation is that anticrack mesh should comprise 0.2% of slab area for unpropped spans and 0.4% of slab area for propped spans. 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.

Where forklift truck (or other similar concentrated loading) is expected 0.5% minimum percentage reinforcement should be used over the supports and 2% elsewhere to control cracking. For further information refer to the ComFlor® manual.

Mesh top cover must be a minimum of 15mm, and a maximum of 30mm. Mesh laps are to be 300mm for A142 mesh and 400mm for A193, A252 & A393 mesh.

For details of the performance of composite slabs comprising ComFlor® 100 decking under a fire condition with nominal anti-crack mesh, please refer to the quick reference fire load tables in this brochure. For other simplified design cases or for full fire engineering, refer to the Comdek software.

Technical services
The Technical Department at Corus offers 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 Comdek software, please contact us.