Which of the following is a common standard for floor covering installation?

A common standard for floor covering installation is ensuring the substrate is clean, dry, and level. This standard is critical because a clean, dry, and level substrate provides a proper foundation for the flooring material.

The cleanliness ensures that there are no debris or contaminants that could interfere with adhesion, which is crucial for maintaining the longevity and appearance of the flooring. A dry substrate is essential since moisture can cause various issues, including mold growth and damage to the flooring material itself. Lastly, a level surface is pivotal in preventing uneven wear, movement, or installation problems that can compromise the integrity of the installation.

These factors directly impact the performance and durability of the flooring, making them vital to any professional installation practice. In contrast, the other options would lead to poor installation practices, possibly resulting in failures or warranty issues.