DENVER (AP) - The U.S. construction industry says it’s in danger of running short on workers to keep up with the demand for building projects, as employees age and more teens are pushed to go to college. To counter the effect, a top construction trade group kicked off an effort this week to help bolster the employment ranks.

The plan by the Associated General Contractors of America, which represents 30,000 companies, aims to draw more people into building trades by establishing charter schools focused on technical training, starting non-union apprenticeship programs and pushing for immigration reform.

The employment concern comes despite the fact that more than 2 million construction workers were laid off during the recession. The group believes many of the laid-off workers have since found work in other fields or have retired.

Meanwhile, about 44 percent of the construction workforce is age 45 or older and nearly one of every five construction workers is 55 or older, according to U.S. Census Bureau statistics.

On immigration reform, the group wants protections for immigrants already in the country and higher caps on the number foreign workers temporarily allowed into the country to work on construction projects.

“Unless there is action soon on these fronts, the construction industry in Colorado and across the country will face worker shortages with increasing frequency,” Ken Simonson, the association’s chief economist, said over hammering and the whirring of a drill at Denver’s Union Station.

“These shortages have the potential to undermine broader economic growth by needlessly delaying and inflating the cost of construction and development,” he said.

The station in the city’s trendy lower downtown neighborhood is being renovated and a hotel and shops are being added along with commuter rail and bus service.

The group picked Denver for the announcement because it has been one of the top 10 metro areas for construction hiring in the past year. Simonson said Colorado’s oil and gas industry is one of the main customers for new construction, but added that the industry is also competing for the same workers as builders.

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