Re-entrant reinforcement

Weak points occur where the concrete slab forms an internal corner because of the overall shape of the building. This internal corner is referred to as a re-entrant corner. It must have additional reinforcement as cracks are likely to develop from this point.

It is sufficient to use additional layers of trench mesh:

  • a minimum of 2 metres long
  • laid diagonally across the re-entrant corner.
Diagram of two concrete slabs with an internal corner. The first slab has cracks at the re-entrant corner. The second slab has a 2 m long reinforcement at the re-entrant corner.