Garage door weather seals, matched to a slab that is never flat

What is garage door weather seal replacement?

Garage door weather seal replacement is swapping the rubber or vinyl that closes the gap between a door and its opening - most often the bottom bulb or U-rubber, plus side and top stop seals on the jambs. It is a small job when the door is square and the slab is close to flat. It is a different job when the concrete has heaved or settled and no single bottom seal can touch both ends of the opening.

Signs you need garage door weather seal replacement

• Daylight visible under the door at rest
• Wind, rain or snow blow in at the bottom corners
• The old rubber is cracked, flattened, torn or missing chunks
• Leaves, dirt and pests enter under a door that otherwise operates fine
• You heat or cool the garage and can feel a draft at the perimeter
• A recent hard winter finished off seals that were already stiff

Seeing something not on this list? Browse garage doors problems by symptom →

How garage door weather seal replacement actually works

1. 1

   Diagnose the gap before ordering rubber

   Close the door and look for light. Check whether the gap is even, worse on one side, or only at the centre. An even small gap is a seal. A large uneven gap can be track alignment, a bent bottom section or a slab problem.

   Watch forOrdering the thickest seal online without measuring the retained channel. Wrong profile means the door will not close on its limits or will crush the new rubber in a week.

2. 2

   Match the bottom seal to the retainer

   Most doors use a aluminium retainer on the bottom section that accepts a specific profile - T-style, bead, or nail-on. Measure the retainer and the door width; cut the new seal long and trim after a test close.

   Watch forForcing a profile that almost fits. It will walk out of the retainer the first cold week.

3. 3

   Replace side and top stops if they are hard or gapped

   Jamb seals nail or screw to the stop moulding and should just kiss the door face when closed. Brittle seals shrink and leave wind paths even when the bottom is perfect.

   Watch forSeals installed so tight the opener strains to close. Photo-eyes and force settings then get blamed for a seal problem.

4. 4

   Consider a threshold seal on bad slabs

   When the concrete is crowned or sunken, a floor-mounted threshold seal can meet a healthy bottom bulb where rubber alone cannot. The slab must be clean, dry and suitable for the adhesive system used.

   Watch forThreshold kits on dusty, freezing or crumbling concrete. Adhesive failure is almost always surface prep, not the product brand.

5. 5

   Retest close limits and reversal

   A fatter seal changes where the door meets the floor. Re-check opener travel limits and the contact-reversal test so the door seals without treating the floor as an obstruction.

   Watch forLeaving the opener set for the old crushed seal. The door will reverse on the new bulb or stop short and leave a gap.

What does garage door weather seal replacement cost?

Bottom seal kits are inexpensive parts; labour is usually a short service visit when that is all you need. Full perimeter seals, custom widths and threshold systems add cost. If the door sections or tracks are failing, seal money is better spent after those repairs - or toward replacement if the door is at end of life.

See the full garage door weather seal replacement cost guide - by material, size and region →

If the number is the problem, here are the ways people pay for it →