Repairs · Toronto
Garage Door Bottom Seal Replacement
After a spring rain there is a puddle inside the door that reaches the tires.
In plain words
In this climate the bottom seal lives a hard life. Meltwater from the car pools at the threshold and freezes the seal to the slab, and the next press of the remote tears it or drags it out of its channel. Road salt stiffens the vinyl and eats the aluminum retainer; deep cold turns a supple strip rigid. Replacement puts a cold-rated profile on a sound retainer, sized to meet the floor without over-compressing, and the technician shows how a wipe of silicone each autumn and a clear threshold keep the new strip from bonding to the ice. The door closes softly onto rubber again, not onto a frozen ridge.
How the visit goesOne end of the bottom seal has slipped out of its channel and hangs down like a loose shoelace. Each time the door closes it folds under, each time it opens it flaps, and the gap beside it keeps growing.
Garage Door Bottom Seal Replacement
How the visit goes
The floor and the threshold
The concrete under the door is half of the seal. The technician looks at the slope of the driveway toward the opening, the condition of the slab edge where the seal lands, cracks, spalled patches and any step between the slab and the apron. A garage floor that has heaved or settled over the decades is common, and the shape it has taken decides whether a standard seal, a taller bulb profile or a threshold seal glued to the floor gives the most even contact. Where water arrives from outside, the path it takes is noted so the seal and any threshold are placed to meet it.
Adding a threshold seal on a difficult floor
Where the slab slopes toward the garage or has a dished edge, a threshold seal glued to the floor follows the existing contour and gives the bottom strip a raised, consistent edge to meet, rather than levelling the floor itself. The floor line is marked with the door closed, the concrete is swept and cleaned for the adhesive, and the threshold is dry-fitted and trimmed against each jamb. Adhesive is laid along the underside, the threshold pressed down, and the door lowered onto it while it sets. The result is a small raised lip on the outside that turns water back to the driveway and a bottom seal that lands on a consistent edge along its length.
The rest of the weather line
With the bottom sealed, any remaining draft points to the perimeter: the vinyl fin on the stop moulding at the jambs and header, and the joints between sections. These were looked over during the visit and anything torn, shrunk or missing was pointed out. Replacing perimeter stripping is straightforward work that can be planned for a mild day. Together with a sound bottom seal and, where the floor calls for it, a threshold, the garage gains a stronger barrier against wind, water and cold on all four edges, and an attached garage can stay closer to the temperature of the house.
Garage Door Bottom Seal Replacement
In the van
Aluminum bottom seal retainer
Bulb or U-style bottom seal
Track clamps
Threshold seal and adhesive
T-style bottom seal
Garage Door Bottom Seal Replacement
What affects the quote
Condition of the old seal
A supple strip slides out in a minute. One that has hardened and seized in its channel, or been torn and frozen into the corners, has to come out in pieces, which takes longer.
Opener adjustment
Resetting the down limit and force and repeating the reversing test after a taller seal is fitted is a short step that the quote names whenever the door has an opener.
Seal profile and size
T-style, bead and bulb profiles in different widths and heights sit at different points on the parts list, and the retainer on your door decides which one is used.
What to have ready
- Is there a car or storage inside that needs moving before the visit?
- Have you seen mice or droppings in the garage?
- Is the door steel, wood, or insulated with a plastic bottom cap?
Garage Door Bottom Seal Replacement: questions
QuestionsThe seal looks fine, so why is there still daylight under the door?
A seal can look intact and still have taken a permanent set, so the bulb no longer springs up to fill the gap. Otherwise the gap belongs to something else: a door hanging out of level, a bowed bottom section, a floor that has settled at one end, or an opener down limit set so the door stops short. The first look during the visit sorts these apart so the fix goes to the right place.
How do I know which size and type my door takes?
Look at the end of the bottom section for the metal or plastic strip that holds the seal. Count the channels, note whether they are slotted or rounded, and measure the distance between them and the width of the door. A photo of the end of the retainer and one of the seal's cross-section is usually enough for the technician to identify the profile before the visit and bring the right roll.
What does a new bottom seal do about water coming in?
It closes the gap between the door and the slab so rain and meltwater meet a continuous barrier. Where the driveway slopes toward the garage, or the slab edge has dipped, the seal alone is working against gravity, and a threshold seal glued to the floor adds a lip that turns water back toward the drive. The technician looks at where the water comes from and recommends the combination that suits your threshold.
