Which stapling configuration is used to secure insulation jackets and facings?

• A. Nut and bolt method
• B. Adhesive tape
• C. Double bound straight type
• D. Hammer stapler

Answer: (C)

Securing insulation jackets and facings needs a stapling pattern that grips both the jacket and the facing along the seam so it stays flat and doesn’t peel away. The double bound straight type accomplishes this by using two parallel bindings formed by a straight line of staples along the edge. This setup locks the facing to the insulation securely, minimizes gaps, and resists peeling or loosening even with handling, vibration, or temperature changes. It provides a clean, continuous edge that protects the seam. Tools like a hammer stapler are used to drive the staples, but the important part here is the arrangement of the staples—the double bound straight configuration—rather than the tool itself. Other options don’t provide the same combination of strong edge grip and simple, repeatable straight binding: adhesive tape can fail under moisture or heat, and nut-and-bolt methods are impractical for continuous jackets, while a hammer stapler is just the tool to apply the staples.