Do Up and Over Garage Doors Need Bottom Seals?
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Do Up-and-Over Garage Doors Need Bottom Seals?
Yes. Up-and-over garage doors need a bottom seal to close the gap between the door panel and the floor. Without one, rain, draughts, leaves, and pests can enter freely under the door.Up-and-over garage doors, whether canopy or retractable mechanism, leave a gap between the bottom of the door panel and the floor when closed. This gap is an inherent consequence of the way the door operates and must be closed by a dedicated bottom seal to provide effective weatherproofing.
Why the Gap Exists
Up-and-over doors swing upward and back when opening, which means the bottom edge of the door rises away from the floor as it opens. To allow this movement without the door dragging on the floor, there is always a small gap between the door bottom and the floor when closed. In canopy doors, the bottom edge lifts forward and up; in retractable doors it moves straight up. In both cases, a bottom seal is needed to close this gap in the closed position.
What a Bottom Seal Achieves
A bottom seal fitted to the lower edge of the door panel creates a flexible contact with the floor that closes the gap when the door is down. The seal compresses slightly as the door closes, accommodating minor irregularities in the floor surface. It prevents rain from blowing or tracking in under the door, blocks draughts, stops leaves and debris from accumulating inside the garage, and prevents insects and rodents from entering through the gap.
Types of Bottom Seal
The most common bottom seal types for up-and-over doors are a rubber P or D profile seal that compresses against the floor, a rubber wiper seal that flexes to follow floor contours, and a brush seal strip that provides a softer, flexible barrier suitable for slightly uneven floors. For doors where the gap is not consistent across the full width, a deeper profile or a brush seal accommodates more variation than a rigid rubber strip.
Over time, existing bottom seals harden, crack, or become detached from the door panel. A bottom seal that is more than five to eight years old should be inspected closely. If light is visible under the door when it is closed, or if water tracks in under the door after rain, the bottom seal needs replacing. Replacement is a straightforward job and one of the most cost-effective weatherproofing improvements for an older door.
Summary
Up-and-over garage doors require a bottom seal to close the gap between the door panel and the floor. Without it, rain, wind, leaves, and pests enter freely. Bottom seals are available in rubber compression, wiper, and brush profiles to suit different gap sizes and floor conditions. Inspect the existing seal annually and replace if hardened, cracked, or allowing visible light or water ingress.
Northwest Garage Door Spares stocks seals for all major up-and-over garage door brands. Find your replacement seal today.
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