AeroBarrier vs Traditional Air Sealing: Complete Comparison

Air sealing is the single most important factor in hitting your BC Step Code airtightness target. The blower door test at the end of the project does not care how hard you tried - it measures air changes per hour at 50 pascals, and you either pass or you fail. The question for every BC builder is which air sealing approach delivers the most reliable path to that number.

This guide compares AeroBarrier aerosol sealing to traditional methods (caulking, tape, spray foam) across the five factors that actually matter: cost, time, reliability, achievable ACH50, and consistency.

The Four Main Air Sealing Methods

Before comparing, let’s define the four approaches you’ll see on BC residential job sites:

Caulking - Liquid sealant applied to joints and seams by hand, typically acoustic or polyurethane sealant
Air sealing tape - Self-adhering tapes used to seal sheathing joints, window/door flashing, and transitions
Spray foam - Closed-cell or open-cell spray polyurethane foam applied to rim joists, penetrations, and sometimes entire wall cavities
AeroBarrier - Aerosol sealant sprayed inside a pressurized building that finds and fills gaps automatically

Most BC homes use some combination of the first three. AeroBarrier is a newer addition to the toolkit, designed specifically to supplement traditional methods and hit tight ACH50 targets.

Cost Comparison

Traditional air sealing on a single-family home in the Okanagan typically costs $2,500-$4,500 in materials and labor if done diligently. Most of that is labor time spent on detailing every joint by hand. Sloppy or rushed execution costs less up front but often leads to failed blower door tests and expensive remediation.

AeroBarrier typically runs $3,500-$5,500 for the same home, including the blower door verification that happens as part of the process. For Step Code 4 targets (1.5 ACH50), the AeroBarrier cost premium is usually offset by FortisBC rebates that reward the tighter result. See how much AeroBarrier costs in BC for a detailed breakdown.

Winner: Traditional methods if you’re targeting Step 3 and your crew is disciplined. AeroBarrier if you need predictable results or are pushing above Step 3.

Time Comparison

Traditional air sealing happens in phases across the construction timeline. Framers seal the sill plate. Insulators detail the rim joist. Window installers flash the rough openings. Drywallers caulk before hanging. Each trade touches air barrier work, and each handoff is a chance to miss details. Cumulative labor across these trades can easily add up to 40-80 hours of focused air sealing time on a typical home.

AeroBarrier adds 4-6 hours of on-site time, usually in a single day at the pre-drywall stage. That includes setup, the seal itself (60-120 minutes of actual spray time), cleanup, and verification. The traditional detailing work is still required as a baseline - AeroBarrier does not replace it - but the additional time needed to reach tight ACH50 numbers is dramatically reduced.

Winner: AeroBarrier, by a wide margin, for reaching below 2.5 ACH50.

Reliability Comparison

This is where the methods diverge most. Traditional air sealing depends entirely on the skill, attention, and discipline of every trade that touches the air barrier. On a typical home, that’s six or more trades. Each hidden mistake - an unsealed plumbing stack, a gap in flashing tape, a missed rim joist corner - shows up on the blower door test. You don’t know how leaky the home is until the test happens.

AeroBarrier runs the blower door in real time during application. You watch the ACH number drop on screen as sealant is applied. If you started at 6 ACH50 and targeted 1.5 ACH50, you see exactly when you hit the target. There’s no hope and no guessing.

Winner: AeroBarrier, decisively. Predictability is its biggest advantage.

Achievable ACH50 Comparison

How tight can each method realistically get a typical BC home?

Method	Typical Result	Best-Case Result
Caulking + tape (basic effort)	3.5-5.0 ACH50	2.5 ACH50
Caulking + tape + spray foam (high effort)	2.0-3.0 ACH50	1.5 ACH50
AeroBarrier (solo)	1.0-2.0 ACH50	Below 1.0 ACH50
AeroBarrier + traditional baseline	0.5-1.5 ACH50	Below 0.5 ACH50

These ranges come from our experience on 100+ residential projects across the BC Interior. The best result we’ve achieved is 0.24 ACH50 - well below Passive House territory.

Winner: AeroBarrier, especially for Step 4 and Step 5 targets.

Consistency Across Projects

Traditional air sealing results vary wildly between builders, crews, and even between homes on the same job site. A builder who hits 1.8 ACH50 on their first home might come in at 3.5 ACH50 on their next one if a different crew handled the rough-in. The variation makes it hard to plan around compliance, quote FortisBC rebates, or offer predictable warranties.

AeroBarrier results are consistent because the process is computer-controlled and verified in real time. A builder using AeroBarrier on a portfolio of homes can expect similar final ACH50 numbers across the portfolio, within a predictable range.

Winner: AeroBarrier.

When Each Method Makes Sense

Based on the trade-offs above, here’s our practical guidance:

Caulking and Tape Only

Make sense for builders targeting Step 3 (2.5 ACH50) who have disciplined crews, strong trade coordination, and a track record of hitting airtightness numbers. This approach works but requires constant vigilance.

Caulking + Tape + Spray Foam

Makes sense for builders pushing toward Step 3.5 or Step 4 (1.5 ACH50) who want to rely on traditional methods. Requires even more diligence and costs more than basic air sealing. Results are still variable.

AeroBarrier

Makes sense for:

Any builder targeting Step 4 or Step 5
Any builder who has failed a blower door test and needs reliable results going forward
Custom home builders who sell on quality and comfort
Tract builders building repeated plans where consistency matters
Builders taking on FortisBC rebate projects where missing the ACH target costs thousands in lost rebate

Combined AeroBarrier + Traditional

Our recommended approach for every serious Step Code project. Use traditional methods as the baseline air barrier strategy, then apply AeroBarrier as the verification and finishing layer. This stacks the benefits of both approaches: traditional methods handle the biggest gaps efficiently, and AeroBarrier finishes the detail work that traditional methods struggle with.

See our air sealing methods comparison for a deeper dive into each individual technique.

What About Spray Foam?

Spray foam deserves its own note because builders often ask whether full-cavity spray foam replaces the need for AeroBarrier. Short answer: it helps significantly, but it doesn’t solve everything.

Closed-cell spray foam in rim joists and cavities provides excellent air sealing at the points where it’s applied. But it can’t seal:

Attic penetrations above the insulation layer
Interior partition wall top plates
Electrical box backs
Window and door rough openings where foam wasn’t applied
Transitions between assemblies
Duct boots and mechanical penetrations

AeroBarrier catches all of these automatically. Combining closed-cell spray foam in rim joists with AeroBarrier on the whole envelope is a very strong air sealing strategy.

Cost-Benefit Analysis for Step Code 4 Targets

Let’s run through a typical scenario: a 2,500 sq ft custom home in Kelowna targeting Step 4 (1.5 ACH50) to capture the full FortisBC rebate.

Traditional air sealing approach:

Materials and labor: $3,500
Risk of failing blower door test: moderate
Remediation cost if failed: $3,000-$8,000
Expected final ACH50: 1.5-3.0 (variable)
FortisBC rebate captured: $0-$15,000 (depending on final result)

AeroBarrier approach (baseline + AeroBarrier):

Materials and labor (baseline): $2,000
AeroBarrier application: $4,500
Total: $6,500
Risk of failing blower door test: low
Expected final ACH50: 1.0-1.5 (predictable)
FortisBC rebate captured: $15,000 (full rebate)

Net cost comparison:

Traditional: $3,500 in sealing work, but only a coin flip for the $15,000 rebate
AeroBarrier: $6,500 in sealing work, with high confidence of capturing the full $15,000 rebate

The math works heavily in favor of AeroBarrier when rebate money is on the line. For builders targeting code minimums without rebates, traditional methods can still make sense.

Frequently Asked Questions

Does AeroBarrier replace traditional air sealing entirely?

No. The best practice is to use traditional methods for the baseline air barrier (framing, sheathing, window flashing, rim joist foam) and then use AeroBarrier as the finishing layer that catches missed details. AeroBarrier works best when the baseline is already reasonable (say 4-6 ACH50 before treatment).

Can I skip AeroBarrier if my crew is experienced?

Maybe, if you’re only targeting Step 3 and you have a strong track record. For Step 4 and beyond, even the best crews find the ACH50 targets hard to hit consistently without aerosol sealing. The predictability is worth the cost.

How does AeroBarrier handle spray foam walls?

Very well. Closed-cell spray foam inside the wall cavity is not a complete air barrier because the drywall, electrical boxes, and plumbing penetrations create gaps that foam doesn’t seal. AeroBarrier finds and seals those gaps after the foam is installed.

Is AeroBarrier worth it for a small home?

Smaller homes are less cost-effective for AeroBarrier because the fixed costs (mobilization, setup, equipment) don’t scale down as much as the variable costs. A home under 1,200 sq ft might be better served by very disciplined traditional sealing. Homes over 1,500 sq ft typically hit a cost-effectiveness sweet spot with AeroBarrier.

Does AeroBarrier work for Passive House projects?

Yes. Passive House targets 0.6 ACH50 (using a different pressure protocol than the BC Step Code 50 Pa test). We have consistently delivered results below 0.6 ACH50 on projects targeting Passive House certification. Our best verified result is 0.24 ACH50.

Ready to Decide?

The right air sealing approach depends on your Step Code target, your crew’s track record, and your risk tolerance. For builders chasing the FortisBC rebate money at Step 4 or 5, AeroBarrier is almost always the right choice. For Step 3 builders who just want to pass the test, traditional methods can still work with discipline.

Call us at 250-864-8727 or get a free consultation to talk through your project specifics. Okanagan AeroBarrier Inc. has completed 100+ verified residential seals and we have achieved results as low as 0.24 ACH50.