Method for installing wallboards in an outside-corner configuration

A method for installing a wallboard in an outside-corner configuration, wherein:

• a wallboard-fastening device comprises:
• first and second framing panels joined lengthwise to each other to form an inner corner;
• first and second corner panels joined lengthwise to each other such that an outside angle between the first and second corner panels is greater than 270°;
• a first bridge panel joined lengthwise to the first corner panel and the inner corner;
• a second bridge panel joined lengthwise to the second corner panel and the inner corner;
• a first flat-spring flange joined lengthwise to the first bridge panel such that the first flat-spring flange, the first bridge panel, and the first framing panel form a first channel, the first flat-spring flange forming a first step with the first corner panel;
• and
• a second flat-spring flange joined lengthwise to the second bridge panel such that the second flat-spring flange, the second bridge panel, and the second framing panel form a second channel, the second flat-spring flange forming a second step with the second corner panel;
• and
• the method comprises:
• inserting an end of the wallboard into the first channel of the wallboard-fastening device;
• placing the inner corner of the wallboard-fastening device against a corner of a framing member;
• and
• driving a fastener through the second framing panel to secure the wallboard-fastening device to the framing member.