What is Concurrent Delay?

                                                                                                                                                                                                                                           
Concurrent delays are two or more unrelated delay periods occurring
simultaneously, each of which independently affects the project end date.

 The more typical situation encountered is where two or more delays overlap at some
point during their existence. The analysis of overlapping delays is especially
difficult because the individual delays can differ as to responsibility (owner vs.
contractor), duration, impact on critical path and the ability to substitute other
work steps for the precluded activities.

Each party must bear its own losses, and the contractor has the burden of proving the costs attributable to the owner and to the contractor, and if that is not possible no damages are recoverable.