Repairs · Oakville
Garage Door Bottom Seal Replacement in Oakville
The garage doubles as a workshop, and with the heater running the floor near the door stays cold and the draft finds your ankles at the bench.
In plain words
The bottom seal, called an astragal in the trade, is the flexible strip along the underside of the lowest door section that squashes against the floor when the door closes. On most steel doors it is a U-shaped vinyl or rubber profile whose two edges slide into the channels of a retainer fixed to the bottom rail; on wood doors it is often a flat angled strip nailed in place. Replacing it means matching that retainer and profile, fitting a fresh seal the full width of the door, and confirming it meets the floor in one continuous line so light, drafts, water and pests lose their route in.
How the visit goesEvery mild afternoon the snow melts off the car, runs to the door, and by morning the rubber strip along the bottom is frozen to the concrete. Last week the opener lifted the door and left half the seal on the floor.
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.
Taking the old seal out
With the door secured, the ends of the old strip are freed from any caps or folds and the seal is drawn out of its channels from one end. A supple seal slides; a hardened one is coaxed with a flat blade and a little silicone, or cut into short lengths and removed a piece at a time. Old nails come out of a wood rail with a claw. The channels are then cleaned of grit, rust flakes, salt crust and any remnants of the previous strip with a wire brush and a scraper, because a clean channel is what lets the new seal feed through without tearing.
A record of the profile and size
Before leaving, the technician tells you what went on the door: the seal profile, whether T, bead or bulb, its width and height, the material, the door width it was cut for, and whether the retainer was renewed. Write this on a card by the opener or inside the manual. Bottom seals wear out on a schedule of years rather than decades, and knowing the profile means the next one can be ordered and fitted without measuring from scratch. If a threshold seal was added, its length and type belong on the same card.
Garage Door Bottom Seal Replacement
In the van
Wire brush and scraper
T-style bottom seal
Aluminum bottom seal retainer
Silicone spray lubricant
Seal end caps
Garage Door Bottom Seal Replacement
What affects the quote
Rodent-resistant seal
A profile with embedded stainless mesh for a garage that has had repeated chewing costs more per length than plain vinyl and is offered where the history calls for it.
Access and clearance
Storage, a vehicle that must stay inside, or shelving against the bottom of the door slows the work. A clear metre inside the door makes the visit shorter.
Retainer replacement
If the aluminum or plastic retainer is bent, spread open or corroded, a new extrusion, fasteners and the time to fit it straight along the rail are added as their own line.
What to have ready
- Has the seal frozen to the floor this winter?
- Is there a car or storage inside that needs moving before the visit?
- Have you seen mice or droppings in the garage?
Garage Door Bottom Seal Replacement: questions
QuestionsHow do I look after the new seal?
Wipe it clean of salt and grit a few times a year, and give it a light coat of silicone spray each autumn so meltwater has nothing to bond to. Keep petroleum products and solvents away from it, since they soften vinyl. Clear ice and packed snow from the threshold before running the door in winter. Once a season, look under the closed door for daylight. That is the whole routine.
The 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.
Should the side and top weatherstripping be replaced at the same time?
It is worth having them looked at while the technician is there. The vinyl fin on the stop moulding around the jambs and header shrinks, tears and hardens on the same schedule as the bottom seal, and a draft that survives a new bottom seal usually comes from the sides. Doing the perimeter in the same visit saves a return trip and leaves the door sealed on all four edges.
Related services
- Garage Door Tune-UpEvery morning the door announces itself to the whole street: a long metallic squeal as it climbs, a rattle at the top, and a groan on the way back down.
- Off-Track Garage Door ResetThe door came down fine but with a scraping noise, and now the vertical track on one side is bowed away from the wall.
- Garage Door Panel ReplacementYears of slap shots have peppered the lower two sections with dents.