Garage Door Threshold Seal

A garage door threshold seal mounts to the garage floor directly under the door, creating a raised barrier that blocks water, drafts, leaves, dust and pests from getting in — even on uneven floors where a bottom seal alone leaves gaps. Our threshold bottom weatherseal kit bonds to the concrete and works with your existing bottom seal for a tight, weatherproof close.

Measure your door width. The threshold runs the full width of the opening and is cut to length. Measure across your door and order enough to span it. The floor must be clean and dry for the adhesive to bond. Questions? Call 877-379-4947.

When to Use a Threshold Seal

Water runs into your garage. A threshold stops rain and runoff from flowing under the door — ideal for sloped driveways.
Your floor is uneven. If the concrete dips, a bottom seal can’t close every gap; a threshold meets it from below.
You want to block pests and debris. The raised barrier keeps out leaves, dust, insects and small animals.

Threshold Seal vs. Bottom Seal

A bottom seal attaches to the door and moves with it; a threshold attaches to the floor and stays put. They’re not either/or — using both gives the most reliable seal, with the door’s bottom seal compressing onto the threshold when closed. For the door-mounted strip, see our bottom seals.

Fits Any Sectional Garage Door

Because it mounts to the floor rather than the door, a threshold seal works with any standard sectional garage door regardless of brand — Clopay, Wayne Dalton, Hörmann, Amarr, Overhead Door, C.H.I., Raynor and more. Just match the length to your door width.

Threshold Seal — FAQ

What’s the difference between a threshold seal and a bottom seal?

A threshold seal bonds to the garage floor and stays in place; a bottom seal attaches to the bottom of the door and moves with it. A threshold is especially good for keeping out water on a sloped driveway or sealing an uneven floor. Many people use both together.

How do I install a garage door threshold?

Clean and dry the floor, cut the threshold to your door width, dry-fit it with the door closed, then bond it to the concrete with the included adhesive. Let it cure before driving over it. It’s a straightforward DIY job with no tools beyond a utility knife and a caulk gun.

Will a threshold seal stop water from coming under my garage door?

Yes — that’s its main job. The raised barrier blocks rain and runoff from flowing under the door, which a bottom seal alone often can’t do on a sloped or uneven surface. Pairing it with a good bottom seal gives the best protection.

What size threshold do I need?

Measure the width of your garage door opening and order enough length to span it — commonly about 9′ for a single door and 16–18′ for a double. The threshold is trimmed to your exact width during installation.