The best ways to install black fiberglass tissues for insulation or flooring involve the following steps: 1. Preparation: Ensure the area is clean and dry. 2. Measuring and Cutting: Measure the area and cut the fiberglass to fit precisely. 3. Laying the Fiberglass: Start from one corner and work your way across, ensuring the material lays flat without wrinkles. 4. Securing the Fiberglass: Use adhesive or mechanical fasteners to secure the fiberglass in place. 5. Overlapping: When necessary, overlap the sheets and secure the overlap to prevent gaps. 6. Finishing: Apply a vapor barrier or underlayment if required, and finish with the desired flooring material. Always follow the manufacturer's instructions for the specific product being used.