This material, typically made of polyvinyl chloride (PVC), is a flexible seal applied to the edges of doors to prevent air and water infiltration. It comes in various forms, including foam tapes, bulb seals, and felt-lined strips, each designed for specific gap sizes and door types. A common example is the compression seal applied to the bottom of a door, creating a barrier when the door is closed.
Effective sealing improves energy efficiency by reducing drafts, lowering heating and cooling costs, and enhancing indoor comfort. It also minimizes noise penetration and protects against moisture damage, which can lead to mold growth and structural issues. Historically, materials like felt and rubber were used, but advancements in polymer technology have made PVC a popular choice due to its durability, weather resistance, and affordability.