How to Stop Cold Air Coming Under a Garage Door
Figure out whether you need a bottom seal, floor threshold, perimeter weatherstrip—or all three.
A cold garage often feels like an insulation problem when the real culprit is an air gap. Before buying anything, inspect the bottom edge, the corners and the side/top perimeter with the door closed.
1. Check the bottom seal first
If the rubber or vinyl seal is cracked, flattened, missing sections or no longer touches the floor, replacement is usually the first move. Match the replacement profile to the retainer on your door rather than buying solely by width.
2. Use a threshold when the floor is the problem
A floor-mounted threshold can help when the slab is uneven or water and wind push under the door. Measure the largest gap across the entire opening before choosing height.
3. Don't ignore the sides and top
Perimeter weatherstrip should lightly contact the door when closed. Daylight at the sides or top is a strong clue that replacing only the bottom seal will not fix the draft.
Our buying rule
Start with the problem and the constraints, then buy the simplest product that solves them reliably. Bigger, more powerful or more expensive is not automatically better.
Shop for the right fit
Use the buying criteria above to compare current listings and manufacturer specifications. Prices and availability can change.
Compare on Amazon (paid link)Last updated September 2026. Product specifications and retailer availability can change; verify current manufacturer specifications before purchase.