These barrier devices, typically made of rubber, silicone, felt, or metal, are attached to the bottom or sides of doors and windows. They seal gaps, preventing air infiltration and exfiltration. A common example is the thin strip of flexible material found under an exterior door, closing the space between the door and the threshold.
Effective gap sealing significantly improves energy efficiency by reducing drafts, minimizing heat loss in winter, and preventing cooled air from escaping during summer. This leads to lower energy bills and a smaller carbon footprint. Historically, simple methods like stuffing rags or paper into cracks were used. Modern materials and designs offer superior performance and durability, enhancing comfort and reducing noise intrusion.
