Cover to reinforcement (concrete beam: EC2)
The nominal concrete cover is the distance between the surface of the reinforcement closest to the nearest concrete surface (including links and surface reinforcement where relevant) and the nearest concrete surface.
You are required to set a minimum value for the nominal cover, c nom, u, for the top, bottom, sides and ends of each beam in the beam properties.
These values are then checked against the nominal limiting cover, cnom,lim which depends on the diameter of the reinforcement plus an allowance for deviation, Δcdev (specified in Design Options > Beam > General Parameters).
Generally, the allowance for deviation, Δcdev is a NDP.1 The recommended value is 10mm, but under strict controls it can be reduced to 5mm.
If cnom,u < cnom,lim then a warning is displayed in the calculations.