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When installing fiberglass insulation between floor joists, the most common method for attaching the insulation is using nails and wire. This method ensures that the insulation stays securely in place, preventing it from sagging or falling out over time. The wire, often used in conjunction with fasteners, helps to hold the insulation tightly against the joists, creating an effective barrier that enhances thermal performance and minimizes airflow. Additionally, this technique allows for easy adjustment and replacement of insulation if necessary, making it practical for contractors working on various projects.

While adhesives and other methods may be used in specific situations, they are not the standard for securing insulation in between floor joists. Using staples or clips can limit the insulation's effectiveness if not done correctly. Similarly, zip ties may not provide the necessary stability and are not a traditional method for this application. The nailing and wire method is widely recognized and accepted in construction practices for ensuring proper insulation installation.