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Insulating Plaster Walls with RetroFoam

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Insulating Plaster Walls with RetroFoam Blog Feature
Eric Garcia

By: Eric Garcia on May 15th, 2024

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If you’re considering insulating your home to enhance energy efficiency and comfort, you might wonder about the compatibility of insulation methods with different wall materials – specifically, plaster.

As more homeowners look to understand their insulation options, one common question arises: “Can RetroFoam be installed with plaster walls?” The answer is a resounding yes! But let’s dive deeper into how this process works and what you need to know.

How to Insulate Plaster Walls with RetroFoam

RetroFoam insulation is a popular choice for many due to its ease of installation and effectiveness. 

When it comes to insulating plaster walls from the outside, the process is virtually identical to insulating walls with drywall. This is crucial information for your contractor to have, as it helps them prepare adequately for the installation. They might want to inspect the house to identify any gaps or cracks in the plaster, but the overall installation process remains the same.

Everything you need to know about buying RetroFoam insulation. The essential foam insulation buying guide.

Installation Differences: Plaster vs. Drywall

Now, if the installation needs to happen from the inside of the house, and the crew needs to drill through the plaster, does this change the process?

Surprisingly, not much. 

While it’s true that plaster and drywall are different materials – with plaster often being thicker and more robust – the method of injecting the foam insulation remains consistent.

Is Plaster Stronger than Drywall?

Yes, plaster is generally stronger than drywall.

This strength is due to its denser composition, which can affect how installation crews handle the drilling process. Drywall contractors often point out these differences, noting that while the materials are distinct, the insulation technique used doesn’t need to be modified substantially.

Can You Insulate Lath and Plaster Walls?

Absolutely!

Lath and plaster walls can also be insulated with RetroFoam. The primary consideration here is the patching post-installation.

Plaster walls might require different materials for patching and a bit more time due to their unique texture and thickness. However, for you, the homeowner, this part of the process is mostly out of sight and won’t differ significantly in terms of the outcome.

What Homeowners Need to Know About Insulating Plaster Walls

For homeowners, the good news is that insulating your plaster walls with RetroFoam is straightforward. 

The steps involved include drilling the same access holes and installing the foam in the same manner as with other wall types. The only slight difference might be in the patching phase if the install is done from the inside, which could take slightly longer and might look a bit different aesthetically.

It’s important to discuss these details with your contractor beforehand so they can arrive fully prepared with the necessary materials.

Why Choose RetroFoam for Your Plaster Walls?

Choosing to install RetroFoam can significantly improve the comfort and energy efficiency of your home.

Whether you’re dealing with drafty rooms in the winter or sweltering heat in the summer, RetroFoam provides an effective barrier that helps maintain a comfortable indoor environment year-round.

To start your journey toward a more comfortable home, visit our Find a Dealer page. Here, you can locate a RetroFoam dealer near you who is experienced and ready to help you take control of your home’s comfort and efficiency.

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About Eric Garcia

Eric brings his knowledge and training in building science, training in spray and injection foams from the manufacturers, more than eight years installing foam insulation, as well as selling and managing in the foam insulation industry. He is also BPI and Dale Carnegie certified and has taken several building science courses, including air sealing and building envelope. Eric is the Professor of Foam on our educational YouTube series Foam University. Even when Eric is off he is usually still “working” or thinking about work, but when he can get away he enjoys camping, hiking, hunting, and woodworking.