I am surprised that TKIS has designed one side concrete staircase & other main staircase in structure steel inside the process building .
Have you discussed any time with us on this change of material ?
Last time we had finalized during design & kick off meeting time that all emergency staircase as per Thai rule will of structure steel material & inside process building the staircase will be of concrete material.
This is concrete building then main staircase inside the building shall be concrete material only .
I hope that you are clear on this part .