LAS VEGAS — Hangovers might be a common illness here, but the roofing industry appears to be shaking off any recession-related queasiness if the attendance at this year’s International Roofing Expo is any guide.

The never-sleeping, brightly lit southern Nevada gambling mecca was a good location for this year’s show. Total attendance for the Feb. 24-26 conference was 9,568, a 13 percent increase from the 2013 San Antonio show.