Aeroseal Duct Sealing in Oakville

Your furnace and AC check out fine, but a couple of rooms still never feel right. The home office is chilly every winter morning. The main bedroom won’t cool down until midnight. When the equipment’s working and you’ve still got uneven room temperatures, the next thing to look at is the ductwork between the furnace and those rooms.

We measure how much your ducts leak, repair by hand anything too big for Aeroseal, seal the rest from the inside, then measure again. Both numbers go on your Aeroseal Seal Certificate.

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A recent Oakville job

We recently sealed the ducts in a home in Oakville. Before sealing, the duct leakage measured 44%. After sealing, it measured 2%.

For most of the job, everything went the way it should. Then, partway through the sealing, we noticed a section of ductwork that had partly come apart at a joint. Sealant was coming out of the duct at that spot. You can see it in the first photo, settled as a white, frosty coating on the outside of the duct.

That’s what a gap that’s too big for Aeroseal looks like. Aeroseal seals small gaps, up to about 5/8 inch. A partly disconnected joint is a lot bigger than that, so instead of building up and closing the gap, the sealant just escapes through it. Watching for that while the machine runs is part of the job.

So we stopped, fixed the connection by hand, and once that was sorted, the machine carried on sealing the rest of the system.

The leakage left at the end was less than a twentieth of where it started.

These are measured numbers, not estimates. We test before we start and again after sealing, and every Aeroseal job ends with a Seal Certificate showing both. We never share our customers’ addresses.

44%Duct leakage before sealing

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2%Duct leakage after sealing

Looking up at a duct under the floor framing, with white, frosty Aeroseal sealant coating the outside of the duct and the wires beside it, near a joint where the duct had partly come apart — Sealant that escaped from a partly disconnected duct joint in the Oakville home and settled on the outside of the duct. We stopped, fixed the joint by hand, then finished sealing.

Duct sealing machine with a laptop on top in an unfinished basement, beside the furnace, with large clear tubes running across the room — The setup in the Oakville basement. The clear tubes connect the machine to the duct system. The laptop screen and the furnace label are blurred for privacy.

Where we work in Oakville

All of Oakville, including Old Oakville, Bronte, Glen Abbey, River Oaks, West Oak Trails, Joshua Creek, Iroquois Ridge, Clearview, Falgarwood and the newer neighbourhoods in north Oakville. Oakville is part of our regular service area.

What we watch while the sealing runs

Aeroseal isn’t something we switch on and walk away from. While the machine runs, we keep checking:

The leakage reading. The machine tracks the leakage as it seals, so we can see it coming down. If it stops dropping the way it should, we go looking for the reason.
Sealant where it shouldn’t be. Sealant showing up on the outside of a duct, like on the Oakville job, means there’s an opening too big for Aeroseal. We stop and fix it by hand.
The blocked registers. Every register stays covered until we’re done, so the sealant stays inside the ducts.

How it works

Test first. We measure your duct leakage before we start.
Fix what’s too big for Aeroseal. Large gaps and loose or disconnected ducts we can find get repaired by hand.
Block every register. Each one gets covered so the sealant stays inside the ducts.
Seal from the inside, and watch it. The Aeroseal machine sends sealant mist through the ducts, and it closes the leaks from within. If a bigger problem shows up partway through, we stop and fix it.
Test again and give you the Seal Certificate, with the before and after numbers in writing.

Most homes take about 4 hours for sealing, or about 6 hours with air balancing. See the full process →

What Aeroseal can’t fix

Aeroseal seals gaps up to about 5/8 inch. Bigger holes and disconnected ducts, like the joint on the Oakville job, need a hand repair, and we’ll tell you before doing any extra work. It’s not duct cleaning either: cleaning takes dust out, Aeroseal closes leaks. And it won’t make an undersized furnace or AC bigger. If the test shows sealing won’t help much, we’ll say so.

Price

Aeroseal duct sealing: $1,499 + HST
Aeroseal plus air balancing: $1,799 + HST

All registers in the home included.

Also included: the leakage test before and after, hand-sealing of accessible gaps, Aeroseal sealing and your Seal Certificate. See all services and prices →

Oakville questions

What happens if something goes wrong mid-sealing?

We stop and deal with it. On a recent job in Oakville, the sealing was going fine until we noticed a section of duct that had partly come apart at a joint, and sealant was coming out there. We stopped, fixed the connection by hand, and then let the machine carry on. A problem like that doesn’t ruin the job. It just has to be fixed before the sealing can finish.

How do you know the sealant is going where it should?

We watch the whole time it runs. The machine shows the leakage coming down as it seals, and we keep an eye on the ductwork we can see. If sealant turns up on the outside of a duct, there’s an opening that’s too big for Aeroseal, so we stop and fix it by hand. At the end we measure again, and that number goes on your Seal Certificate.

What do the leakage percentages actually mean?

Put simply, it’s how much of the air moving through your ducts is getting out through leaks instead of reaching your rooms. We measure it with the same test before and after, so the two numbers compare like for like. In Oakville it went from 44% to 2%. Every house is different, which is why we test yours before we quote.

Can’t I just seal the leaks myself?

Only the ones you can get to. Most ductwork runs inside walls, floors and ceilings, so you’d never reach those joints. Aeroseal works from the inside, so it gets to the gaps you can’t see. And if a joint has actually come apart, it needs a proper repair first.

How long does it take, and do I need to be home?

Most homes take about 4 hours for sealing, or about 6 with air balancing. If we have to stop and fix something by hand, like the duct joint on the Oakville job, that adds some time. Someone needs to let us in and be around at the start and the end.

Do you come to Oakville?

Yes. Oakville is part of our regular service area, from the lakeshore up to north Oakville. We work Monday to Saturday, 8 am to 6 pm. Call 647-218-8031 for the next opening.

Find out how much your ducts leak

Call or text 647-218-8031, Monday to Saturday, 8 am to 6 pm. Or send us your postal code and what’s going on, and we’ll call you back with a price.