If you're researching ways to make your home more energy-efficient, you've probably come across the term building science.
And if you're like most homeowners, your next thought is, okay, but what does that actually mean for my house?
That's exactly what we're going to break down.
RetroFoam of Michigan has been helping homeowners improve comfort and energy efficiency since 2002, using foam insulation. Along the way, we've seen firsthand how building science principles impact everything from high energy bills to drafty rooms.
So let's take a closer look at what building science is, and why it matters for your home.
• Building science is the study of how your home works as a system -- including insulation, airflow, moisture, and energy use.
• Air sealing is one of the biggest factors in improving comfort and lowering energy bills.
• Not all insulation performs the same -- some allow air movement, while others stop it.
• A contractor who understands building science looks at the whole home, not just one problem area.
• Better building science means better comfort, lower bills, and fewer issues like drafts or moisture.
At its core, building science is the study of how a home functions as a complete system.
That includes how:
Heat moves in and out of your home
So when you ask, "What is the science of building?" -- It's really about understanding how all of these pieces work together, not separately.
Because here's the thing. Your home isn't just insulation, or just a furnace, or just windows.
It's all of it working together, or sometimes working against each other.
When it comes to existing homes, building science becomes even more important.
That's because most homes:
A contractor who understands building science for existing homes doesn't just look at one issue, like cold rooms or high bills.
They look at:
Where air is getting in and out
This bigger-picture approach helps solve the actual problem, not just the symptom.
Insulation plays a major role in building science, but not all insulation works the same way.
A key part of building science is controlling air movement.
Here's where things start to differ.
Materials like fiberglass and cellulose:
That means outside air can still sneak in, and your conditioned air can escape.
Injection foam and spray foam:
That air seal is a big deal.
It helps:
And ultimately, that's where you start to see improvements in comfort and energy costs.
Not every contractor approaches your home the same way.
If someone truly understands building science, they should:
One indicator of this knowledge is certification through organizations like the Building Performance Institute (BPI), which focuses on whole-home performance.
When building science principles are applied correctly, you'll notice:
In other words, your home starts working with you instead of against you.
Now that you understand what building science is, the next step is seeing how it applies to your home, especially when it comes to insulation and air sealing.
If you want to dig deeper, exploring how air sealing works is a great place to start. Luckily, our Learning Center has tons of resources to answer all of your questions along the way.
What is an Insulation Contractor?
Building science is the study of how your home works as a system, including airflow, insulation, moisture, and energy use.
The science of building focuses on how materials, design, and systems work together to create a comfortable, efficient, and durable home.
Building science helps identify the root causes of issues like high energy bills, drafts, and uneven temperatures—so they can be fixed correctly.
Not always.
Insulation helps, but without proper air sealing, your home can still lose energy through air leaks.
From a building science perspective, insulation that creates an air seal—like injection foam or spray foam—can provide better overall performance.