If you have poured concrete walls, chances are you’ve asked yourself at some point: “Why is my house so uncomfortable, and why are my energy bills so high?”
You’re not alone, and more often than not, the problem is hiding right behind your drywall. The biggest issue is – your walls aren’t like those in a traditional home. Instead, you have poured concrete walls.
The good news? Learning how to insulate poured concrete walls doesn’t mean tearing your house apart. There are ways to add a material like injection foam insulation, improve comfort, and boost energy efficiency without a full remodel.
Let’s break it down.
• Poured concrete walls are sold and don’t have cavities like block walls.
• Most homes have furred-out stud cavities added during construction.
• These cavities are often left uninsulated, leading to discomfort.
• Insulation can be added by injecting foam into the stud cavities.
• The process requires minimal disruption – no demo needed.
• Homeowners typically only need light sanding and repainting afterward.
• Proper insulation creates an air seal that improves comfort and efficiency.
Before diving into how to insulate a poured concrete wall, it helps to understand what you’re working with.
When people think of concrete walls, they’re usually thinking of concrete block. Those blocks have hollow cores that can be filled with insulation.
Poured concrete walls? Totally different. They’re solid – like your driveway or sidewalk. In areas like Florida and Louisiana, poured-concrete walls are favored for their greater resistance to hurricanes and tornadoes, according to the International Association of Certified Home Inspectors.
There’s no cavity inside the concrete to fill. So, how do you insulate something solid?
During construction, contractors typically fur out poured concrete walls.
That means they build a stud cavity in front of the concrete so drywall can be installed.
This creates a cavity between the drywall and the concrete wall.
Here’s the issue: In many homes, that cavity is completely empty.
That means:
If you’re wondering how to insulate concrete-poured walls without remodeling, here’s exactly how it works from inside the home using RetroFoam insulation.
Before any work begins, the crew protects your home:
This keeps everything clean and contained.
Installers snap a chalk line across the wall to mark the location of each cavity.
This ensures:
Small holes are drilled into each stud cavity.
These holes allow installers to:
Before injecting foam, installers check the interior of the wall with a specialized tool.
They’re looking for:
If something is in the way, they simply drill another hole above it or below it.
Now the fun part of the job begins.
The installer:
This ensures the cavity is completely filled and creates a full air seal, which is key to improving comfort and energy efficiency.
Once the injection foam is installed:
The crew cleans everything up before leaving.
All that’s left for the homeowner is:
And just like that, it looks like nothing ever happened.
If your drywall isn’t up yet, you have another option for insulation.
Instead of injection foam, you can apply spray foam insulation directly in the stud cavities.
This insulation method is common in:
But for existing homes, injection foam is typically the best solution because it avoids tearing everything apart.
If your stud cavities are empty, your home is:
By insulating poured concrete walls, you can:
It’s one of those upgrades you don’t see, but you definitely feel.
If your home has poured concrete walls and feels uncomfortable, your insulation – or lack of it – could be the culprit.
The good news is you don’t need a full remodel to fix it.
Now that you know how to insulate poured concrete walls, you can take a simple, minimally invasive step toward a more comfortable and energy-efficient home. When you’re ready, check out our Find a Dealer page to locate a RetroFoam dealer in your area.
Insulating Concrete Block Walls with RetroFoam
Insulating Exterior Walls from Inside with RetroFoam
How Do RetroFoam Installers Know the Cavity is Full When Insulating Existing Walls?
Yes.
Injection foam allows installers to fill the wall cavities by drilling small holes – no demolition required.
For existing homes with finished walls, injection foam is often the best option because it fills the cavity completely and creates an air seal.
If the home is new construction or undergoing a remodel and there isn’t drywall in place, using spray foam insulation is the best option.
Not always, but it’s very common – especially in older homes or basements.
Yes.
Homeowners often notice:
Just a little:
They’ll handle the rest.