ComFlor® 80

ComFlor® 80 – is the next generation of profiled steel composite decks; it is the only 80mm profile available in Colorcoat® pre-finished steel to provide a durable and attractive appearance.

The large corner curvature detail provides a very efficient profile. In conjunction with the higher grade of steel, it ensures typical unpropped spans of 4.4m simply supported and in the continuous condition, spans of 5m can be achieved.

The large spans achievable means less structural steel and thus cost saving in the overall construction cost, providing more scope for architects and engineers in their design process.

The innovative profile design provides real benefits.

Central stud placement provides superb composite action between the beam and concrete due to the stud being positioned exactly in the centre of the trough. This ensures the correct concrete cover to the stud and hence, the full design capacity of the stud is developed. The central location of the stud also reduces on-site checking to ensure that the stud has been positioned correctly.

Ideal for car parks ComFlor® 80 is available with a Colorcoat® pre-finished steel underside for use in car parks, giving a durable and attractive appearance and minimising future maintenance.

Excellent concrete usage means that ComFlor® 80 is very economical compared to other similar decks.

Improved manual handling The cover width of ComFlor® 80 is 600mm, to reduce sheet weight and improve handling.

FibreFlor mesh free system ComFlor® 80 is fully tested with the FibreFlor system to provide all the no mesh benefits. See following pages for the load tables and further design information.

Design information

ComFlor® 80 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
130 0.086 2.03 1.99 1.61 1.53
140 0.096 2.27 2.22 1.80 1.70
150 0.106 2.51 2.45 1.98 1.88
160 0.116 2.74 2.68 2.17 2.06
170 0.126 2.98 2.91 2.36 2.23
180 0.136 3.21 3.14 2.54 2.41
190 0.146 3.45 3.38 2.73 2.59
200 0.156 3.68 3.61 2.92 2.76
250 0.206 4.86 4.76 3.86 3.64


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/m3
  • Normal weight (dry) 2350 kg/m3
  • Lightweight (wet) 1900 kg/m3
  • Lightweight (dry) 1800 kg/m3
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
0.90 0.86 0.12 1387 47.6 185 15.4 12.5
1.20 1.16 0.15 1871 47.6 245 22.2 18.5


Decking material
Corus Galvatite, hot dip zinc coated steel EN 10326-S50GD+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® 80 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.