French and Bifold Patio Doors Before Winter: Fog, Cracks, and Drafts in Metro Vancouver
Late October in Metro Vancouver is the last quieter week before the wind settles in. Halloween is Saturday, October 31. The clocks fall back on Sunday, November 1, so the trip home is dark an hour sooner. Across Vancouver, Burnaby, Surrey, Coquitlam, and the Fraser Valley, decks are wet and the first frost is close inland. The glass many people walk past is a hinged French door, or a bifold stack onto the deck.
A sliding patio door rides a track. A French door swings on hinges. A bifold folds and stacks. Fog, a crack, and a cold line at the meeting stile do not mean the same thing on those doors.
If the door slides and drags, start with our sticky patio door post. Fogged sliding glass versus a whole new slider is our patio door fogging guide. Balcony railings are covered in our glass railing windstorm check. This note stays on French doors and bifolds, and on patio door glass.
Why this week is the practical time to look
Winter wind on the coast is usually a long push. A door that rattles can work for hours. A small crack can travel. A latch that almost holds can pop, and a swinging leaf can slam.
Cold nights widen the gap between indoor heat and the air outside. A failed seal shows as fog you cannot wipe. A draft at the stile feels sharper than it did in September. A dry afternoon this week is easier than a wet Sunday after the clocks change.
What fog between French door panes looks like
Stand on the room side in daylight, then again after dark with a lamp on. Wipe one patch with a dry cloth.
If the haze clears, the moisture is on a surface you can reach. Room-side film and outdoor dew are common in this weather. Our room-side condensation versus a failed seal post walks through that wipe test.
If the haze stays, it sits between the panes. You will often see a milky veil, streaks, or droplets you cannot touch. One lite in a pair can fail while the other stays clear. Cleaner will not dry the cavity. The view usually gets duller through a wet winter.
On a French door that still swings, latches, and sits square, the usual fix is a new insulated glass unit in the existing door. The frame and the hinges stay. We check the frame on a free visit before anything is ordered.
Full-lite doors are one large piece of glass in each leaf. Divided-lite doors can be several smaller units, or one unit with bars that only look separate. Include the bar pattern in a photo. Obscure glass hides fog until you stand close.
A crack or a chip in door glass
Patio door glass is tempered safety glass, which is what BC building codes call for here, and what goes back in. It cannot be trimmed to lose a bad corner.
- A crack that runs, even a short one, usually means that lite is finished.
- An edge chip is a common place for a later break, especially if the door slams.
- Tape can mark the crack so people see it. It holds nothing together.
- The usual fix is a new unit made to that opening.
If the pane is still one piece and the door latches, you can often book a measured replacement on a normal visit. If the glass is open to the weather, or it has fallen into small pebbles, keep people and pets back. Do not pull a half-hung sheet out of the frame. Call emergency glass. Board-up closes the leaf. Permanent glass follows once the opening is measured. Same-day replacement is sometimes possible, depending on size and the glass on hand.
A crack with no hit mark can be an old edge flaw that let go in the cold. The cause can vary. The lite is still replaced, which is why our tempered glass after fall storms post says a patch does not hold.
If the lite is gone, leave the bare frame and keep a towel as a short cover only. Photograph the door and anything that hit it. We can help with the glass paperwork described in our storm documentation post. The insurer decides the claim. The first hour is in our fall storm guide, and how long plywood should stay up is in our board-up duration post.
A draft is not always the glass
Cold air at a French door has three common homes. Check on a windy evening, with the door latched.
- The middle of the glass feels cold, and the unit is fogged or it is a single sheet. The glass is the weak spot. A double-pane low-E unit is the usual answer when the leaf can take the thickness.
- A thin cold line at the meeting stile, the threshold, or the hinge side, and the glass is clear. That is often weatherstrip, the sweep, or a door that no longer pulls tight. New glass will not fill a gap along the astragal.
- The door will not latch, or it springs back when you let go. The leaf may be out of line. Wind will use that gap all winter. Forcing it shut can stress a lite that is already cracked.
Run the back of your hand around the closed door and note where the cold starts. A daylight photo of the meeting stile is enough for a first read. Lift-and-slide doors are a separate type we also service. If yours lifts before it moves, say so.
One bad panel in a bifold stack
Bifold and multi-slide doors show up on newer houses and renovated suites across the region. Panels fold and stack to one side, or to both. Configurations often run from three to eight panels, and each one is a large piece of glass.
One fogged panel does not condemn the wall. If the others are clear and the stack still folds, replacing that insulated unit is often enough. A perfect colour match to older glass can vary, and we say so before glass is ordered.
A cracked panel is more urgent, because people walk through that opening. Leave a binding fold alone. Count the panels, say which one is bad from the left as you face the deck, and send a wide photo plus a close-up. Odd sizes are made to the opening, so timing can vary.
When the glass goes, and when the door goes
One photo is not a final call. The frame is checked on site.
| What you notice | Often means | Usual next step |
|---|---|---|
| Fog you cannot wipe, and the door still swings or folds | Failed seal in that lite | New insulated glass in the existing door |
| A crack, an edge chip, or a hole | That tempered lite is finished | Replace that glass; board-up if the opening is open |
| Clear glass, cold only at the meeting stile or sill | Weatherstrip, sweep, or a loose latch | Sort the close before new glass |
| A single clear sheet, with no gap inside the glass | Single-pane lite | A double-pane low-E unit, if the leaf can take it |
| Several lites fogged, and the frame is soft or will not latch | The glass and the door | A full door may be the better path |
| One bifold panel cracked, and the rest fold smoothly | That panel only | Replace that panel's glass |
In a condo or a townhouse, the leaf is sometimes yours and the exterior frame is the strata's. Bylaws vary. This is not legal advice. Common-property doors start on our strata page. A private patio door is usually residential glass.
Send the city, the door type, and whether the glass is fogged, cracked, or only drafty. We measure before glass is cut. Frames are often aluminum, vinyl, wood, or fiberglass. With over 15 years here, as a licensed and insured shop, the split is usually simple. A failed seal in a sound leaf is a new unit. An open break is board-up, then glass. A draft with clear glass is a close check first. Most of these jobs finish within a few days of the first visit. A common size is sometimes same-day. The measure is a free in-home visit through Get A Quote.
FAQ
Can you replace one lite in a French door and leave the other?
Often, yes. If the other leaf is clear, the hinges work, and the pair still latches, that one insulated unit is the usual order. A divided-lite door may need only the small pane that failed.
Is a draft at the meeting stile a glass problem?
A cold line where the doors meet, with clear glass, is often weatherstrip or a latch that no longer pulls tight. New glass does not fill that gap. If the center of the glass feels cold, or the unit is fogged, the lite is the conversation.
Does one fogged bifold panel mean every panel has to be replaced?
Usually, no. One clear stack with a single cloudy panel is a one-unit job. Several failed panels, or frames that no longer sit square, are when a larger replacement comes up. Someone needs to see the door first.
Should a cracked patio door wait until spring?
A stable crack in a door you can latch can be scheduled. It should not ride all winter in wind that slams the leaf. An open hole should not wait for spring.
Ready to check the French doors and bifolds before the wind?
Fog you cannot wipe, a crack in the lite, or a door that will not latch will still be there on the first real storm. A draft that is only weatherstrip is a different job. A look this week is easier than a boarded door in November rain.
Get A Quote · Call emergency glass · See patio door glass · Call or text 778-239-6052 · Email info@vancityglassltd.com
VanCity Glass Team
Related glass services in Metro Vancouver
Vancity Glass Ltd can help with French and bifold patio door glass, emergency glass service, glass repair in Vancouver. For the address and hours, the shop is at 1289 Hornby St, Vancouver, and the phone is 778-239-6052.