felt

This material typically consists of a strip of dense, compressed wool or synthetic fibers attached to an adhesive backing. Applied to door frames or the door itself, it creates a barrier against drafts, dust, and noise. A common application is along the bottom edge of a door, often in conjunction with a threshold, but it can also be used along vertical edges.

Effective sealing of gaps around doors contributes significantly to energy efficiency by reducing heat transfer. This, in turn, can lower energy bills and minimize environmental impact. Furthermore, it enhances indoor comfort by minimizing cold drafts and reducing noise infiltration. While modern materials like rubber and silicone are prevalent, fiber-based barriers have a long history of use, offering a simple and often cost-effective solution.

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