Which method is NOT a good way to seal an opening?

Which method is NOT a good way to seal an opening?

• A. Stuffing fiberglass into it
• B. Installing a factory-made plate
• C. Using caulk or sealant
• D. Weatherstripping the opening

Answer: (A)

The idea is to create a continuous barrier that stops air movement around an opening. Stuffing fiberglass into the opening does not achieve that. Loose-fill insulation can settle, shift, or leave gaps, so air, moisture, and even pests can still pass through. It’s designed for insulation, not for sealing openings, and it won’t meet typical sealing or fire-safety requirements. By contrast, a factory-made plate provides a solid closure that fits the opening; caulk or sealant fills gaps around edges to block air leaks; and weatherstripping creates a compressible seal around movable parts. So stuffing fiberglass into an opening is not a reliable way to seal.

The idea is to create a continuous barrier that stops air movement around an opening. Stuffing fiberglass into the opening does not achieve that. Loose-fill insulation can settle, shift, or leave gaps, so air, moisture, and even pests can still pass through. It’s designed for insulation, not for sealing openings, and it won’t meet typical sealing or fire-safety requirements. By contrast, a factory-made plate provides a solid closure that fits the opening; caulk or sealant fills gaps around edges to block air leaks; and weatherstripping creates a compressible seal around movable parts. So stuffing fiberglass into an opening is not a reliable way to seal.