N.C. Gen. Stat. § 44A-29

No surety shall be liable under a payment bond for a total amount greater than the face amount of the payment bond. A judgment against any surety may be reduced or set aside upon motion by the surety and a showing that the total amount of claims paid and judgments previously rendered under such payment bond, together with the amount of the judgment to be reduced or set aside, exceeds the face amount of the bond.