Replacing Windows and Doors Before a Manitoba Winter

A window or door that is draughty in January is usually failing at one of three places: the seal in the glass unit, the weather stripping in the sash or slab, or the gap between the frame and the wall it sits in. Only one of those requires replacement. Before a Manitoba winter, the highest-value work is finding out which one you actually have, because a full replacement done for a problem that was really an installation gap solves nothing.

Cold air coming off a window is one of those things homeowners live with for years and then suddenly cannot ignore. Usually it is the first proper cold snap that does it. You walk past the living room window and feel a draught, or the front door has frost on the inside of the frame, and the question becomes whether it is time to replace everything.

Sometimes it is. Windows and doors do wear out, and a house full of original units from decades ago is going to lose more heat than a house with newer ones, no argument there.

But a large share of the draught complaints we look at are not the window failing. They are the space around the window, or the hardware, or an adjustment nobody has made since the unit went in. Those are cheaper and faster problems, and it is worth knowing which one you have before you commit to anything.

Here is how to tell them apart, and what actually matters when you do replace.

At a Glance

• Three separate failures cause draughts: the sealed glass unit, the weather stripping, and the rough opening around the frame

• Frost or condensation between the panes means the sealed unit has failed, which is a replacement conversation

• Frost on the inside surface of the glass is usually humidity and airflow, not a failed window

• A door that latches in summer and sticks in winter is usually adjustment, not failure

• The installation detail around the frame matters as much as the window you buy

• Late fall installs are workable, but the sealant and foam products have temperature limits

• Replacing a door slab without addressing the threshold and sill often leaves the draught in place

How Do I Know If My Windows Actually Need Replacing?

Look at where the moisture is, because it tells you which layer failed.

Moisture or fogging between the panes of glass, which you cannot wipe off from either side, means the sealed unit has lost its seal. The insulating gas is gone, and the unit is no longer doing its job. In many cases, the sealed unit itself can be replaced within the existing frame rather than replacing the whole window, which is worth asking about.

Frost or condensation on the inside surface of the glass, the surface you can touch, is a different story. That is warm, humid indoor air meeting a cold surface. It tells you the glass is cold and the room is humid. That can point to an old single or poorly performing unit, but it can just as easily point to indoor humidity that is too high for the outdoor temperature, or curtains and blinds blocking air movement across the glass.

Air movement you can feel with a hand at the edges, especially at the corners and along the sash, points at weather stripping or at the perimeter seal rather than the glass.

What Is Actually Behind Most Draughts?

The gap between the window frame and the framing of the wall.

Every window sits in a rough opening slightly larger than itself, and that space has to be insulated and air sealed. When it is done properly you never think about it. When it is stuffed with loose batt insulation, or left partly empty, or filled with foam that was never trimmed and sealed on the interior side, you get a cold perimeter that feels exactly like a bad window.

You can often find this yourself. On a cold, still day, run the back of your hand slowly around the interior trim, not the glass. If the cold is strongest at the trim line rather than at the glass, the issue is the installation, not the unit. Removing a piece of interior casing usually tells the rest of the story in about two minutes.

This matters because a brand new window installed into the same badly sealed opening will feel almost identical to the old one. The homeowner concludes the new windows were a waste of money. The windows were fine. The install detail was the problem, and it stayed the problem.

What Should I Look For in a Door Before Winter?

Doors fail differently than windows because they move.

A door has weather stripping on three sides and a threshold seal at the bottom, and all of it wears. Compressed, cracked, or flattened weather stripping stops sealing, and it is a straightforward replacement in most cases. The bottom sweep and threshold take the most abuse and are the most common source of the visible daylight gap people notice.

Seasonal sticking is worth understanding rather than forcing. A wood slab or a wood frame moves with humidity, and a door that closes easily in February and drags in July is behaving normally. The opposite pattern, a door that latches fine in summer and will not seal in winter, more often means the frame is moving with the house or the hinges have sagged, and both are adjustable.

Frost on the interior of a metal door frame is a thermal bridging issue, meaning cold is conducting straight through the metal. That is a design characteristic of some older units rather than a defect, and the fix is usually replacement rather than repair.

Does It Matter What Time of Year Windows Are Installed?

It matters less than people think for the unit and more than people think for the sealants.

Removing and installing a window is not a warm-weather-only job. Crews do it in cold conditions regularly, one opening at a time, so the house is never fully open. What is temperature sensitive is the chemistry. Exterior sealants, foams, and some flashing tapes have minimum application temperatures, and using them below those temperatures means they never reach the adhesion they were designed for. That failure is invisible on the day and shows up in a year or two.

So the practical guidance is that late fall installs are fine, deep winter installs need a contractor who will tell you honestly which products they are using and what those products need, and if you are planning a large whole house replacement, getting it scheduled inside the shoulder season is simply easier on everybody.

If you are already planning exterior work, this is also the moment to bundle. Windows, doors, and siding share the same wall assembly, and doing them separately means opening and detailing the same area twice. Our comparison of siding for Manitoba winters covers how those choices interact.

What Actually Makes a Difference in Cold Weather Performance?

A few things, in rough order of impact.

• The installation detail. Air sealing and insulation at the perimeter, done properly, on the inside face as well as the outside.

• The frame material and its thermal break. Frames conduct heat, and the frame is a larger share of the opening than most people assume.

• The glazing package. Number of panes, coatings, and the spacer at the edge of the unit all matter, and the spacer is the part nobody asks about even though it is where edge condensation starts.

• Operation type. Units that seal by compression when latched tend to hold a seal better over time than units that seal by sliding.

• Exposure. The window on the north or west wall takes a different beating than the sheltered one, and it is reasonable to prioritize rather than replace everything at once.

Real Scenarios

Every window in the house is original, and you are dreading the whole project. You do not have to do it in one go. Prioritizing by exposure and by which rooms you actually use is a legitimate strategy, and it spreads the work across seasons.

One window has fogging between the panes and the rest are fine. That is a failed sealed unit, and it is often a sealed unit replacement rather than a full window replacement. Ask specifically.

Your new windows still feel cold. Check the trim line before you blame the windows. If the cold is at the perimeter, the rough opening was not detailed properly and that can be corrected without replacing anything.

Your front door frosts up on the inside every winter. Look at whether the frost is on the slab, the frame, or the glass insert. Frame frost on a metal frame is conduction, glass frost is humidity, and slab edge frost is weather stripping. Three different fixes.

You are already planning exterior work for spring. Get the window and door decisions made now rather than in April. Winter is planning season here, which we get into in our post on what construction work can still get done through a Manitoba winter.

FAQ

Can I replace just the glass instead of the whole window?

Often yes, when the frame and sash are sound and only the sealed unit has failed. It is worth having someone confirm the frame condition before assuming either way.

Is condensation on my windows a sign of a problem?

Interior surface condensation is usually about indoor humidity meeting a cold surface. It becomes a problem when it is persistent enough to soak the sill and the trim, which leads to mould and rot. Lowering indoor humidity in cold weather and improving airflow across the glass are the first steps.

Will new windows stop my house feeling draughty?

They will help if the windows are the source. If the draught is coming from the attic, the rim joist, or the perimeter of the openings, new windows alone will disappoint you. Our fall home exterior checklist covers the other places to look.

Do I need a permit to replace windows or doors?

Requirements vary by municipality, especially where an opening is being resized rather than replaced like for like. Your contractor should handle it.

How long does a window replacement take per opening?

A straightforward like-for-like replacement moves quickly. What extends it is opening the wall and finding rot, a rough opening that needs rebuilding, or an out of square frame that has to be corrected.

Should the exterior trim and capping be replaced at the same time?

Generally yes. The capping and trim are part of how water is managed around the opening, and reusing old capping over a new window frequently leaves the weakest part of the assembly in place.

Ready to Find the Actual Draught?

Flip Flop Construction handles windows, doors, siding, and the wall assembly behind them across Winnipeg, Steinbach, Kleefeld, Grand Beach, and surrounding Manitoba communities, along with Red Lake, Kenora, Dryden, and remote fly in communities in Northern Ontario. One crew means the opening, the insulation, the flashing, and the exterior finish are all handled by the same people, so nothing gets blamed on the last trade.

Take a look at everything we handle, see past work in the portfolio, and get in touch before the first hard freeze.

431-777-5219 flopconstruction@gmail.com flipflopconstructioninc.com One crew, every trade, no excuses.