RedR has supplied engineers in response to requests from humanitarian agencies, but only 40 were in the field on Tuesday.
Some 3,000 engineers have signed up to offer help since the tsunami struck.
'It is still taking on average three weeks to get engineers out to where they are needed, ' RedR vice president Peter Guthrie said.
'Yet we are all seeing TV pictures of people who have got themselves out there under their own steam much faster and seem to be needed and making a difference.' The World Economic Forum in the US has a Disaster Response Network (DRN) of engineering, construction, logistics and transportation companies.
This bridges the gap between businesses and humanitarian agencies to make it easier for companies to offer in-kind donations and help coordinate the aid effort more effectively.
But its offer of engineers had not been taken up as NCE went to press.
'It is a bit frustrating but the first effort was to save lives and recover bodies. I suspect it will quickly shift into reconstruction, ' said Parsons Brinckerhoff Telecommunications chief executive and executive director of the DRN Bob Bellhouse.