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The lowermost seal on an exterior door, typically made of rubber, silicone, felt, or vinyl, prevents air and water infiltration. This component creates a barrier between the door and the threshold, closing the gap that would otherwise exist. For example, a flexible sweep attached to the bottom of a door adjusts to variations in the threshold height to maintain a tight seal.

Effective sealing at the base of an exterior door significantly enhances energy efficiency by reducing drafts and heat loss. It also protects against moisture damage by preventing rainwater and snowmelt from entering the building. Historically, simple felt or brush-like materials were used. Modern materials and designs offer superior durability, weather resistance, and sealing capabilities, contributing to more comfortable and energy-efficient buildings.

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The rubber or vinyl seal affixed to the lower edge of a garage door plays a vital role in protecting the garage interior. This barrier prevents the ingress of water, debris, insects, and pests, while also enhancing energy efficiency by minimizing drafts. A typical example comprises a flexible material shaped to fit the contours of the door, often incorporating a T-shaped or bulb-shaped end for a secure seal against the floor.

Maintaining a tight seal at the base of the garage door is crucial for several reasons. It safeguards stored items from weather damage and pest infestations, contributes to a more comfortable interior temperature, and can reduce energy costs. Historically, simpler materials like felt or brush-like seals were used, but advancements in polymer technology have led to more durable and effective solutions. These modern seals offer superior resistance to wear and tear, temperature fluctuations, and UV exposure, contributing to a longer lifespan and better performance.

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