Which of the following is not a proper method to attach steel decking?

The task requires understanding the proper methods used to attach steel decking. Steel decking requires robust and reliable methods of attachment to ensure structural integrity and safety.

Using hardware fasteners is a conventional yet effective method for attaching steel decking. This method allows for simple installation and strong connections, enabling the decking to support loads effectively.

Welding the edges of the steel decking is also an accepted practice. Welding provides a strong, permanent bond, ensuring that the decking remains securely in place during the life of the structure.

Foam adhesive, while it may provide some level of support, is generally not an appropriate method for attaching steel decking. Foam adhesives do not offer the strength or durability required for structural applications and might not withstand the loads and environmental factors that steel decking is subjected to.

The option that indicates "2" does not represent a viable method for attaching steel decking as it lacks a clear and applicable process. Therefore, it stands out as not being a recognized or proper method in the context of steel decking installation.

In summary, the answer highlights that "2" is not a proper attachment method for steel decking because it is unclear and lacks relevance, whereas the other methods specified are standard practices within the industry.