How Hurricane Katrina inspired these millionaire twins to invest in small businesses

It took a tragic event to drive the business of millionaire twins Cain and Cam Roberds, stars of "Blue Collar Backers."

The Roberds brothers began their construction company in 2009. After completing several buildings from churches to retail spaces, the twins decided to add something new to the mix.

"Now, we're combining our construction skills and our business know-how to help back small business owners and help them realize their dreams," Cain says in a new video from the Discovery Channel series that Business Insider is exclusively premiering. "To be able to go out there and help someone else, I think it's just in our blood."

Being in business with a sibling isn't always easy, the brothers admit, because they're very competitive with each other. But they can agree on the importance of community, which was tested in 2005 when Hurricane Katrina hit. The guys explain that the towns that were hit by the hurricane are still struggling to rebuild the Mississippi coast.

"We're looking to be pioneers of rebuilding this area," Cain said. "So we're keeping our eyes open for any investment opportunities out there," Cain said.

On "Blue Collar Backers," which airs Fridays at 10 p.m., investors try to help save small businesses that have been denied loans by the big banks. But they don't just invest money into the businesses - they invest their time and sweat.

For more on the show's investors, visit the show's Facebook page.

Learn more about the Roberds brothers in the exclusive video below: