WELLbuilt on Indoor Air Quality - Episode 8

The second element in the WELLbuilt system is Indoor Air Quality.

Why does the air we breathe matter? Did you know that when particles (i.e. viruses, contaminants, chemicals etc) are small enough (PM2.5) they can penetrate our organs and cross the blood-brain barrier all by breathing them in!

Transcript

Podcast Script Episode 8

WELLbuilt Element 2: Indoor Air Quality Is Not What You Think It Is

Opening 

Let’s talk about something that affects every home—but likely never gets discussed during design conversations.

Indoor air quality.

Most people assume that if their home is clean, new, or recently renovated, the air inside it must be healthy.

But the reality is this:

Modern homes often have worse indoor air than older ones.

Not because builders are doing something wrong.

Because the entire construction industry has been trained to think of air quality as a ventilation checkbox rather than a biological system.

*intro music*

Welcome back to the Renovation Secrets podcast, where we talk about some of the uncomfortable truths in the residential design, build, and renovation industry. And why I created the WELLbuilt system to help designers, builders, AND homeowners maximize the HOW of making our homes support our health and well-being.

For those of you who are new here WELCOME. My name is Natalia Pierce, and with over 20 years in the renovation industry, being a Certified Master K&B designer and WELL AP certified, I have seen firsthand how our homes are failing the families who live in them.

Too often, speed in execution and budget take over the priority, especially in new construction. We introduced the first element of WELLbuilt in episode 7 on lighting which I will expand on more in future episodes. Today we move on to the second element of the WELLbuilt system; Indoor Air Quality

We’ve focused on insulation.
 We’ve focused on airtightness.
 We’ve focused on energy efficiency.

But we haven’t focused nearly enough on what happens to the air once it’s trapped inside the building envelope.

And that has consequences.

Why IAQ Became a Critical Design Issue 

The average person spends about 90 percent of their time indoors.

Which means the quality of the air inside your home has more impact on your health than the air outside it.

And yet most residential projects make exactly two assumptions:

If there’s an HRV, the air must be fine.
 If there’s a range hood, the kitchen must be fine.

Neither of those assumptions is reliable.

Indoor air quality is influenced by:

• cooking
 • cleaning products
 • building materials
 • cabinetry finishes
 • furnishings
 • flooring
 • combustion appliances
 • attached garages
 • humidity levels
 • and outdoor pollutants entering the home

Air is not static.

It’s dynamic, reactive, and constantly changing.

Which means it has to be managed intentionally.

The Airtight Home Paradox 

One of the biggest shifts in residential construction over the last twenty years has been the move toward airtight building envelopes.

And this is a good thing.

Energy-efficient homes are more comfortable, more durable, and more predictable to operate.

But airtight homes also trap contaminants more effectively.

So if ventilation isn’t properly designed—or used consistently—pollutants accumulate rather than dissipate.

This includes:

carbon monoxide
 nitrogen dioxide from gas cooking
 volatile organic compounds from finishes, furniture, and other products entering the home
 particulate matter from cooking
 and excess humidity

Many homeowners assume these are rare exposures.

In reality, they’re daily exposures.

The Kitchen Is the Largest Source of Indoor Air Pollution 

One of the biggest surprises for clients is learning that the kitchen is typically the largest single contributor to indoor air pollution inside a home.

Cooking releases particulate matter at levels that can exceed outdoor urban traffic conditions.

Especially when frying, searing, or using gas appliances.

Without proper ventilation, those particles remain suspended in the air and circulate throughout the house.

And here’s the critical part:

If a range hood is noisy, people don’t use it.

So performance isn’t just about airflow capacity.

It’s about whether the system is quiet enough to become part of daily behaviour.

That’s where design decisions start affecting health outcomes directly.

Filtration Alone Is Not Enough 

A lot of homeowners assume that upgrading their furnace filter solves indoor air quality concerns.

Filtration helps.

But filtration is only one piece of the strategy.

Healthy indoor air depends on three things working together:

ventilation
 filtration
 and source control

And increasingly, there’s a fourth component that’s becoming essential:

monitoring

Because if you don’t measure indoor air quality, you’re making decisions based on assumptions instead of evidence.

Why Monitoring Changes Everything 

Monitoring is where indoor air quality shifts from theory to reality.

When homeowners can see levels of:

carbon dioxide
 particulate matter
 humidity
 and VOCs

, something important happens.

Air quality stops being invisible.

And behaviour changes.

People turn on range hoods more often.

They ventilate differently.

They adjust humidity levels earlier.

They recognize when something inside the home is affecting how they feel.

Monitoring transforms indoor air from something passive…

into something manageable.

The Bigger Role IAQ Plays Inside the WELLbuilt Framework

Indoor air quality is the second element of the WELLbuilt system because it operates quietly in the background of everyday life.

People don’t usually notice air quality until something goes wrong.

Until headaches start appearing.

Or fatigue increases.

Or sleep feels inconsistent.

Or allergies don’t improve indoors.

But when air quality is designed —and verified properly—the difference is measurable.

And more importantly, it’s noticeable.

Because a home shouldn’t just protect you from the weather outside.

It should actively support how you function inside it.

And that’s where indoor air quality stops being a mechanical system…

and starts becoming part of a health strategy.

If you want more information on the WELLbuilt system head to our website at detail-by-design DOT ca – forward slash WELLbuilt. As a professional you can sign up for the Pilot launch later in April 2026 or as a homeowner we can do a WELLbuilt analysis.

Until next time breathe easy and thanks for listening. Credits to Hill Makes Music for our intro music

Have a great day.