What issue can arise from using tack strip with pinless clamp-down metal or "Z" bar in doorways?

Using tack strip with pinless clamp-down metal or "Z" bar in doorways can lead to the issue of carpet backing breaking down. The "Z" bar is designed to secure the carpet in place, but when used incorrectly with tack strips, it may create stress points on the carpet backing. This can compromise the integrity of the backing material, especially if the installation is not performed with appropriate tension and spacing. Over time, the pressure and lack of proper support can cause the backing to deteriorate, leading to potential failures in the carpet's overall performance and longevity.

This outcome underscores the importance of proper installation techniques and material compatibility. It highlights how improper use of installation methods and materials can lead to long-term damage, which is critical knowledge for technicians.