Repairs · Barrie
Garage Door Bottom Seal Replacement
With the door closed and the lights off, a bright line of daylight runs along the floor from one side to the other.
In plain words
What you have afterwards is a door that closes onto a single soft line of contact from jamb to jamb. Daylight under the door is much reduced, the draft across the floor eases, wind-blown leaves and snow are kept out more effectively, and the tighter gap makes the route in harder for mice. The opener has been reset so the door lands gently on the new strip instead of pressing it flat. You also leave knowing the seal's profile and size, which makes the next replacement a matter of one phone call, and a couple of simple habits for winter that keep the new seal from freezing to the floor.
How the visit goesThe strip under the door has gone as hard as a hose left out for ten summers. Press it and it does not give; bend it and it cracks. Where the door meets the floor it sits on the concrete without squashing at all.
Garage Door Bottom Seal Replacement
How the visit goes
Reading the gap with the door closed
The assessment starts with the lights off and the door down. From inside, the technician looks along the floor line for daylight and notes where it shows: a thin line the full width, a wedge at one corner, or a patch in the middle. A straightedge laid across the threshold shows whether the slab is flat or dished, and a hand run along the seal feels where it touches and where it hovers. Photographs of the worst spots are taken so you can see what is being fixed. This map of the gap tells the technician how tall the new seal needs to be and whether anything other than the seal is contributing.
Closing the door onto the new seal
The clamps come off, the opener is reconnected, and the door is run closed under power while the technician watches the bottom edge meet the floor. The down limit is adjusted so the seal compresses gently along its full length without the section bowing, and the force setting is checked so the door settles onto the new, taller strip without reversing. From inside with the lights off, the floor line is checked again for daylight. The reversing test with a 38 mm (1.5 in) solid object, or a 2x4 laid flat under the door, and the photo-eye test finish the visit, and you are shown the door closing before the ladder is packed.
A door that meets the floor in one line
The first thing you notice is the absence of daylight. With the door closed and the lights off, the floor line is dark from one jamb to the other, and the draft that used to move across the floor is much reduced. The door lands softly, because the opener now stops when the seal is gently compressed rather than driving the section into the concrete. Leaves, grit and drifting snow are kept out far more often. If you crouch and look, the new bulb sits evenly along the slab, filling the low corner the old strip used to hover above.
Garage Door Bottom Seal Replacement
In the van
Bulb or U-style bottom seal
Silicone spray lubricant
Nail-on vinyl strip for wood doors
Track clamps
Aluminum bottom seal retainer
Garage Door Bottom Seal Replacement
What affects the quote
Floor and threshold shape
A dished, sloped or heaved slab may call for a taller bulb profile or a threshold seal on the floor, each of which is quoted as a separate choice you can accept or leave.
Door width
A single door takes a shorter length of seal than a double, and the widest doors need more time to feed the strip evenly across. The quote starts from the width measured on the day.
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
- Have you seen mice or droppings in the garage?
- Is there a car or storage inside that needs moving before the visit?
- Does the door stop short of the floor or reverse before it closes?
Garage Door Bottom Seal Replacement: questions
QuestionsWhat is a threshold seal, and when is it worth adding?
A threshold seal is a rubber or aluminum-backed strip glued to the garage floor along the line where the door closes. The door's bottom seal lands on it, and its raised outer edge turns water, wind-blown debris and small visitors back toward the driveway. It earns its place where the drive slopes toward the garage, the slab sits below the apron, or the floor edge is too uneven for the bottom seal alone to meet cleanly.
Can mice get past a garage door bottom seal?
A worn, hardened or chewed seal is one of their favourite routes, and even a small gap at a corner is enough. A fresh, continuous seal sized to the floor removes that route. For a garage with repeated trouble, seals with a stainless mesh embedded in the vinyl are available and resist chewing. Keeping the jamb seals sound at floor level matters just as much, since a gap beside the door serves them equally well.
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-UpThe door lands with a thud you can feel through the kitchen floor, and sometimes it bounces back up a few centimetres before settling.
- Off-Track Garage Door ResetYou tapped the door with the bumper while backing in, barely a nudge, and now the bottom corner has swung inward.
- Garage Door Panel ReplacementA stray ball went through one of the window panes in the top section.