Composite slabs require crack control and distribution reinforcement in the top of the slab in accordance with BS5950 Part 4 clauses 6.7, 6.8 and 6.9 or BS EN 1994-1-1. This reinforcement is usually in the form of steel fabric in accordance with BS4483.  In many cases, the reinforcement provided for crack control and distribution may be suitable to achieve the required fire resistance, this should be checked against the load/span tables contained in this document. Where designs are outside the scope of these tables, additional bottom reinforcement may be required – Refer to SMD Deck design software, SCI Publication P-056 or Eurocode NCCI PN005-GB.


Any additional reinforcement requirements not associated with the composite action of the deck and concrete (i.e. cantilevers, void trimming, composite beams, building regulation compliance) are to be designed and specified by others.


The detailing of all reinforcement within the composite slab is the responsibility of others.

roof deck


Due to demand, sheet reinforcement mesh is readily available from our stockyards daily.

  • Stock sheets are 4.8m x 2.4m
  • A142
  • A193
  • A252
  • A393
  • Electrically welded to BS4483

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