Murray & Roberts says its technical, engineering, legal and forensic specialists are taking part in an investigation into the M1 scaffolding collapse.
Two people were killed and 23 injured when the bridge collapsed on Wednesday.
Strong winds and a possible collision involving a cement truck are under investigation.
The company has, however, denied they blamed the collapsed on "strong winds".
The company's share price dropped 7.3 percent yesterday but has largely recovered.
The Money Show’s Bruce Whitfield interviewed Murray & Roberts CEO Henry Laas.
Scroll down for quotes from the audio below.
I have visited some of the injured. We’re going to ensure they are properly taken care of.— Henry Laas, Murray & Roberts CEO
It is impossible for us at this stage to give any indication of what caused this collapse.— Henry Laas, Murray & Roberts CEO
The scaffolding is designed to withstand a truck running into it.— Henry Laas, Murray & Roberts CEO
There are a number of parallel investigations underway.— Henry Laas, Murray & Roberts CEO