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RetroFoam Injection Foam Insulation for Existing Walls

Because Cold Drafts and Huge Temperature Swings Between the Rooms in Your Home is Not the Norm

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Ditch the Blankets and Extra Layers of Clothes with the Help of Retrofit Exterior Wall Insulation

You are sitting in your home during the winter and feel an annoying, cold draft. Unfortunately, nobody forgot to shut the door - it is just another day in an uncomfortable home with insufficient or no wall insulation. Insulating the exterior wall cavities with RetroFoam injection foam will compress any old insulation in the walls and seal up the area to prevent air leakage - helping to reduce drafts, keep rooms more comfortable, control energy costs, and deaden outside noise.


Updating Your Exterior Wall Insulation with RetroFoam Injection Foam is a Great Decision for Your Family’s Comfort

Comfortable Rooms

Foam insulation fills all the nooks and crannies in existing walls to provide the necessary air seal to reduce drafts and keep indoor temperatures consistent.

Sound Deadening

Foam insulation in exterior walls can help to deaden the outside noise of loud vehicles, noisy neighbors, and barking dogs.

Reduced Energy Bills

Preventing air leakage improves your home’s energy efficiency, reduces the carbon footprint, and puts more money back in your pocket.

A More Comfortable Home is Within Reach

The easy and convenient install process turns your family’s dream of a comfortable home into a reality - without the stress and mess of a full remodel.


Insulating Your Existing Walls with RetroFoam of Michigan

We’ve been insulating existing homes across Michigan with spray and injection foam for over 17 years. Our consultative project managers, highly skilled crews, and helpful office staff aim to guide you through the whole process with ease. Also, our lifetime warranty gives your family access to our family long after the job is complete.

Our process for retrofit exterior wall insulation is quick, simple, and typically installed in just one day. Most walls are insulated from the outside, but we can also inject foam into walls from the inside if needed. However, the install process is slightly different depending on the home’s siding type.

Vinyl and Aluminum Siding

A strip of siding is removed from your home and holes are drilled between the stud cavities. After injecting the foam insulation in the cavity we plug the hole, put your siding back on, and clean up any excess foam.

Wood Siding

Depending on the condition and make of your wood siding, we may be able to remove it and follow the same process we do for vinyl and aluminum siding. If we aren’t able to remove it, we would drill through the siding to inject the foam, then plug the hole with a tapered wood plug.

Brick Exterior

We can also insulate through a brick exterior without removing any brick.

Our installers drill ⅝ inch holes through the mortar joints to inject the foam insulation, and the holes are re-mortared upon completion using a standard gray mortar.

Concrete Block Walls

Concrete block walls can be insulated by using either spray foam or injection foam, depending on the look the homeowner wants to accomplish.

The foam can be sprayed directly on the concrete wall, or in some cases, it can be injected into the cores of the concrete blocks.

Our Start to Finish Process

  • Scheduling a Free Estimate
  • Creating a Personalized Plan for Your Project
  • Schedule, Prep, and Install your Insulation
  • Follow Up and Warranty

Learn More About Our Process

“Awesome company - great work! Made a huge difference in not only insulation for heat/cool temps, but cuts down on noise too. Would highly recommend them.”

Beth Yoskovich

Read More Testimonials

Learn More About Injection Foam Insulation for Your Existing Walls


What is Injection Foam Insulation? What it's Made Of and How it Works

Not quite sure what injection foam is? Learn all about injection foam, including its composition, areas it can be installed, and how it works in your walls.

Read More


What is the Cost to Insulate Walls with Foam in an Existing Home?

Curious about the cost to inject foam insulation in your existing exterior walls? Learn about the factors that impact the pricing, as well as what you might expect to pay for your project.

Read More


How to Insulate Without Taking Down Drywall

Adding fiberglass or wet applied cellulose to your walls means your drywall has to come down. Learn why that's not the case with injection foam and how it's installed from outside the home.

Read More

Frequently Asked Questions

What’s the difference between injection and spray foams?

The difference is how they are installed. Injection foam is used to insulate exterior walls from the outside. Spray foam is used in any open cavity, including exposed walls, attic, crawl space, and rim joist. Learn more.

Can the drywall pop off or crack in existing walls during installation?

It’s rare, but it can happen. That’s why a lifetime warranty is important because those repairs will be made at no cost to the homeowner. Learn more.

How do the crews know when a wall cavity is full?

The installer runs the injection hose all the way to the top of the cavity and then all the way to the bottom. This helps to ensure the wall cavity is completely filled. Learn more.

How does siding effect how exterior walls are insulated?

Most homes have either aluminum, vinyl, or brick siding and in some cases wood. The process for installing injection foam for each of these is different. Learn more.

How much does it cost to insulate walls with injection foam?

The cost to insulate your existing walls with injection foam varies depending on the size of the area to be insulated, as well as several other factors. The cost to insulate those walls can range from $3,000 to $7,000. Learn more.

What happens to the old insulation in the walls when injection foam is installed?

If there is fiberglass in those existing walls, then the injection foam will compress it. If there is cellulose, there may need to be some removal. Learn more.

What if I need electrical work done?

The injection foam we use in the walls is very pliable, which means an experienced electrician will be able to fish wiring through the foam with ease. Learn more.

What causes condensation on interior walls?

If there is a large temperature difference from the outside to the inside of your home and you’re lacking insulation, this can cause walls dripping with condensation. Learn more.

Can you insulate existing interior walls?

Yes, we can. Many homeowners do this to dampen the sound coming from another room or to reduce odors. Learn more.

Should I insulate the wall between my garage and house?

Yes, this will help cold air from getting into your home through the attached garage. It can also help cut down on noise and smells. Learn more.

How can I tell if my wall is insulated?

If you aren't sure if your walls are insulated you have a few options to figure it out. You could ask the previous homeowner, remove the faceplate on an outlet, or drill a small hole in the wall. Learn more.

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Tell cold drafts and uncomfortable rooms who’s the boss.