He was working with Parminder Singh, 21, from Slough who was taken to Charing Cross hospital after suffering a broken jaw and pelvis.
During the investigation at T5 the performance of the shoring adaptors has been called into question. The investigation is still ongoing.
Laing O'Rourke chairman Ray O'Rourke said: 'Without prejudging the outcome of the investigations into the tragic accident at T5, in the interests of safety across the construction industry, we urge everyone to comply with SGB's urgent request,'
BAA managing director of Terminal 5 Tony Douglas said: 'We hope that by issuing this statement, it reinforces the need to take seriously this safety alert and act upon it immediately'