Insulated Siding Vs Foam Board: Which Is Better?

If you're looking for a way to save energy, you should put insulation on your top list. Insulating your house will help you save more home energy because it helps keep the desired temperature in your home during different seasons. So, which kind of insulation is better?

If you're considering insulated siding and foam board insulation in the list, then it's good to know their differences, pros, and cons. We've researched this concern to help you decide which to choose.

Insulated siding is a traditional siding with rigid foam board attached behind it. It's great for insulating the house and adds beauty to the siding of a house.

Foam board insulation is also an excellent option for insulating homes. They are perfect for people who love DIY since they are very easy to install.

Deciding which of these two great insulators will solely depend on your preference. Continue reading as we give you their advantages and disadvantages to help you decide which is best to use for your home. In this post, we will also answer some frequently asked questions. Let's get started!

House wall insulation with rock wool and plastic siding boards, Insulated Siding Vs Foam Board: Which Is Better?

Insulated Sidings

3D rendering of a wall with construction details and layers

Insulated siding is one of the best ways to insulate your home. They are typical vinyl siding; the only difference is that insulated sidings have rigid foam boards behind them that are responsible for insulation. 


Styrofoam Sheets Stacked on white background

Insulated sidings have many benefits, which make them popular for many homeowners. Here are some of them:


Insulated sidings are suitable investments for your home because they not only insulate the house but also improve the house's look. They level the wall behind it and hide the irregularities of the wall.

They come in many different dark colors, which adds to their heat-resistant property. 


One thing that people look into when it comes to their house is the durability of the material. Insulated sidings have added contour, which allows for added support and makes them more durable.

This property also helps the siding to withstand weather and even rocks, balls, or other things that can damage it.

Insect Blocker

Insulated siding is not only known for its durability, but it is also able to fill up the gaps in the siding of your house, which makes them good for keeping insects out of the house.

They do not attract termites and other pests, unlike when you use wood sidings.

Sound Proofing

One benefit of insulated siding is that it lessens the amount of sound that enters the house. These are perfect for houses near the road where cars and other vehicles produce noisy sounds.

Energy Efficiency

Amid increasing prices of commodities, people are looking for a better way to lessen energy costs. One of the best things you can do about it is to install insulated siding in your house.

They help in controlling the temperature during different seasons.

There are gaps and studs found in the house's sidings. These studs are where the heat energy can escape making your energy cost higher. Insulated sidings fill these gaps, which makes them an efficient way to save home energy.


Despite the many benefits of insulated siding, there are still negative sides. Here are some of them:


One of the main drawbacks of insulated sidings is their cost. They are more expensive compared to traditional sidings. Its materials are one of the factors that makes it more costly. They also come in various premium colors, which makes their price higher.

Trickier Installation

Although the overall process of installing traditional vinyl siding and insulated sidings are similar, there are additional steps that you need to add when installing insulated sidings.

Since insulated sidings have foam boards behind them, you will need to use additional equipment when installing.

Installing an insulated vinyl siding will require you to use a table or hand saw to cut the panels. You also need to take into account the doors, windows, and other openings. Prepare them to accommodate the thicker sidings due to the thickness of the insulated panels.

Foam Board Insulation

Polystyrene insulation boards.

Foam boards are insulation materials that come in many kinds. They are good insulators that can be used from the top down to the bottom and even on the sidings of your home.

Click here to see this foam board on Amazon.


Foam boards are perfect for insulation on almost all parts of the house. Here are some of the benefits of using it:

Easier Installation

Because of its lightweight and easy-to-handle materials, foam board insulators are easier to install than insulated vinyl sidings. They are DIY-friendly and can reduce the cost of overall production and labor costs.

Energy Efficiency

Just like the insulated sidings, foam board insulation is also energy efficient. This is also because they reduce the heat energy coming out of the house during winter, which can lower energy costs.

Controls Moisture

Aside from protecting the sheathing and framing from rain and water leaks, it also makes the interior warm, preventing and controlling the accumulation of moisture.

Air Leak Prevention

Another advantage of having foam board insulation is that it prevents air from coming in and out of the room. When air continuously comes in and out, it can cause inefficiencies.


Here are some of the disadvantages of foam board insulation:


Just like the insulated sidings, one of the most common drawbacks of foam boards is their cost. Foam boards are a bit more costly than other forms. However, its benefits will eventually make it worth its price. 

Needs Proper Installation

Although foam boards are easy to install, they should be properly put in. If foam boards are not properly installed, they can limit the benefits a foam board can provide.

You should consider different code restrictions during installation so that moisture and air cannot penetrate through the walls.


Although foam boards have many benefits, they are not as strong and durable as other insulations like plywood and OSB sheathing. You will need to have framed and added support before putting on foam board insulations.

Does Insulated Siding Increase R-Value?

Polystyrene insulation boards.

R-value simply means the capacity of a material to resist heat flow. A material with a higher R-value means that the material has a greater insulating ability.

If you're looking at insulated siding as one of the choices you want to use for insulation, you should also consider if the material increases R-value. Generally, insulated sidings have an R-value of 2.0-3.5.

Insulated sidings ensure that your house has a higher R-value when compared to other flat board insulations.

Does Foam Board Increase R-Value?

Foam boards are good insulation materials not just because of the many benefits it offers but also because of their increased R-Value.

The R-value of foam board insulators primarily depends on their types. However, generally speaking, a foam board's R-value is between 3.5-8.0 for each inch of thickness.

These values mean that the foam board insulation has higher heat capacity than the insulated siding, which can increase the R-value of the entire wall. This also means that the insulating power of a foam board is better.

Does Wall Insulation Make A Difference?

A house is a good and long-term investment, especially when it is well-built. If you're trying to build or renovate your house, there are many things to consider. One of the most asked questions is if the wall insulation will be worth it.

A house that has wall insulation can enjoy the benefits insulation can give. One of its most important benefits is its energy-saving ability. Insulation keeps your home warm in winter and cools during summer.

Additionally, wall and ceiling insulation can save up to 40% of your energy bill. Aside from that, adding insulation to your house will also increase the home value, where you can sell the house at a higher price. That is why it is a good idea to invest in good quality insulations.

Final Thoughts

Both insulated siding and foam board insulation are great insulators for homes. They both have many benefits that a homeowner may find good. However, choosing which insulation is better will always depend on your preference and where you will use them.

Keep in mind all the abovementioned advantages and disadvantages of both insulations before deciding which of them you should use.

If you find this article helpful, be sure to check out these other posts that may interest you:

What Are The Best Bathroom Insulation Options?

How Much Siding Is In A Square?

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