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Injection Foam Insulation for Exterior Walls

A home's exterior walls are the largest contributor to inefficient home energy use. RetroFoam injection foam insulation aids in creating an air seal for your home and stopping air leakage.

A home's exterior walls are the largest contributor to inefficient home energy use.

Why should you foam the exterior
walls of your home?

Create an air seal and prevent air leakage with retrofoam
Poorly insulated exterior walls contribute to a wide range of energy efficiency problems:
  • High energy bills
  • Rooms that are too hot or too cold
  • Overworked HVAC units
  • Adjusting what you wear to match the “weather” inside your house
  • People in your home suffering from terrible allergies

"According to the Building Performance Institute,
a house will typically change its air about every 3 hours.

It may be hard to imagine, but in very leaky homes,
the air may change as often as every 30-60 minutes."

Exterior Wall Foam Installation Process

Adding foam to existing exterior walls is a very simple process with little to no maintenance from you, the homeowner. A typical home only takes one day to complete. 

  1. The RetroFoam of the Carolinas crew arrives at the home and the project foreman reviews the scope of the project with you, the homeowner.
  2. The crew will start prepping and covering anything that needs to be protected.
  3. In existing homes, foam insulation is installed by removing a siding piece from around the house. Holes are then drilled in the sheathing between the studs, and the cavities are filled with the RetroFoam injection foam. 
  4. Once the cavities have been filled, the hole is plugged, and the siding is replaced.
  5. The crew cleans up
  6. The project foreman will review the installation with you. They will go over the warranty paperwork with you and will leave you to enjoy your home!

Video, courtesy of RetroFoam Corporate

Injection Foam Installation FAQ's

The quick and short answer- not necessarily.

Why? Think of traditional insulation like a loose-knit sweater. If you wear that out in the cold and wind, you will freeze. If you put a windbreaker over the sweater you will be comfortable. 

Traditional insulation slows down the conduction of heat. The foam is the windbreaker. It stops the air movement. 

Home insulation is very similar. It can either make your home act like a knit sweater or a windbreaker. The builders who built your home did it to the specs of the “sweater.” RetroFoam of the Carolinas turns your home into an efficient, and energy-saving “windbreaker” you and your wallet need it to be.

RetroFoam homes are sealed better. They trap the cold in and block out the heat of the summer. And in the winter, of course, the reverse is true – the heat stays in, and the cold stays out.

Sure you can. But there is a bigger picture we think you ought to consider. It’s essential to look at your home as an entire system. If you focus on just one wall, you will likely not get the results you want. The beauty of RetroFoam is its ability to air seal the walls of your home – and that is where you will see the most significant difference when working with the walls. Add to it the sealing of the attic and crawl space; now you’ve closed the loop on what building scientists call “the building envelope” and are not only keeping the energy in but are also keeping pollens and allergens out.

Absolutely! RetroFoam of the Carolinas can insulate interior walls with injection foam. Some homeowners and business owners choose to do this to reduce noise from room to room.

An injection hose is run all of the ways to the top of the exterior wall cavity and then all of the ways to the bottom. If the hose runs into obstructions the crew member will drill another hole above or below it, and more foam will be injected to make sure that the cavity is completely filled.

But we can’t see everything. We don’t skimp, and our installers know that it is their job to hunt down every crack and crevice, but even so, there are blocks and braces in the walls that we cannot detect. So, let’s say you are having work done in the future, and you find a tiny spot that is missing foam? Just call the concierge team and let them know, and we will send a crew out to fill it free of charge!

Absolutely! We spray and inject a lot of this stuff, so we wouldn’t want to be around it otherwise! Both injection foam and spray foam insulation are safe to have in every area of your home. The spray foam insulation we use is certified Gold Green and has a low VOC. RetroFoam injection foam is completely non-toxic and has no off-gassing.

Sure! Our crews can install foam insulation from the inside of the home. Of course, drilling a 2” hole in an interior wall is a bit more intrusive than an exterior install and requires more prep work.

We ask that everything within 6 feet of the walls is pulled back out of the way. Our crews will cover all surfaces, including the floor and furniture, to ensure they are protected.

Holes are drilled into the drywall between the studs, and the foam insulation is injected into the cavities. Once the cavity is full, a plug is put into place, and a rough coat of drywall mud is applied over the top of it.

So why would anyone opt for this? Many homeowners who are remodeling their interiors and have a decent sheetrock repair and paint crew will have us do an interior install since they will be touching up the drywall and painting anyway.

While rare, this can happen. We typically see it when DIY’ers have used nails in the sheetrock instead of screws or have substituted thinner sheetrock than the standard. But don’t worry, we have trained team members that are accustomed to repairing the wall. It’s an easy process. It’s essential to address your concerns with your Retrofoam Project Manager so you are both on the same page on what will happen should this occur.

Yes indeed! Retrofoam is a soft and pliable foam, so fishing lines through the foam isn’t an issue. However, if it is possible, we recommend that you have all of your wiring work done before we do our installation. But in the event that you have an electrical need and have to fish wire through, the fishing tape will get through the foam just fine.

Retrofoam of the Carolinas offers financing through Green Sky Financing. Your project manager will be able to help you qualify for funding if it is needed. It is a fast process, and the homeowner is typically approved while the project manager is with the homeowner.

The number one determinant of cost for foam insulation is the size of the area being insulated. Are we insulating the attic? The crawl space? The outer walls? How thick are the studs? Is it spray foam or injection foam? What is the required application thickness?

In injection foam, the type of siding on the home will also impact the installation cost.

Let's Talk Foam

Fill out this form and we’ll reach out to you within one business day.

The conversation should last as no more than 10-minutes. We’ll ask you some questions that will help us understand your insulation needs and to put together an estimate.

fill out this form and Start on your path to a more comfortable home and lower energy bills.

Financing Your Foam

Young African American Couple Reviews RetroFoam Financing Options with GreenSky
Finance with GreenSky Credit
Payments as low as $69 per month!*

RetroFoam of the Carolinas offers financing through GreenSky

GreenSky offers several options for financing your home. Your project manager will be able to help you apply for funding and special rates unique to RetroFoam of the Carolinas.

It is a fast process, and the homeowner is typically approved within the hour.

*Monthly payment amounts are dependent upon the qualifying interest rate, the payment terms, and the total cost of the project.