How to Know the R-Value of Closed Cell Spray Foam Insulation?

The R-value of spray foam insulation measures how well it stops conductive heat flow. Insulating resistance goes up as the value goes up. Looking at the R-value, you can tell how well a specific type of insulation keeps heat from escaping. The spray foam insulation R-value depends on how thick and dense the insulation is.

While closed-cell spray foam is more expensive than other types of insulation, its superior performance means it will save you money in the long run by lowering your energy bills. Closed-cell spray foam insulation has an R-value of 6.5 per inch, which can help reduce your energy bills by up to 50 percent. Compared to fiberglass, it’s also resistant to moisture, which means it won’t soak up water and won’t let mold or mildew grow. Plus, it’s durable and can last up to 100 years.

What is closed-cell spray foam insulation?

When insulating your home, closed-cell spray foam is one of the most effective options on the market. This type of foam is made up of plastic that is expanded to create small cells that are filled with a gas, typically hydrofluorocarbon.

These cells are very close together, which gives the foam its high r-value. It has one of the highest R-values of any type, making it highly effective at keeping the heat in or out of your home. The main benefit of spray foam is that it does an excellent job of sealing off a wall cavity, preventing air and moisture from entering or escaping. 

Spraying Closed Cell Spray

Spray polyurethane foam (SPF) is a type of spray foam insulation that is made up of closed cells. This means the foam does not allow air or water to pass through it, making it an effective barrier against heat and moisture. SPF is commonly used in residential and commercial applications and can be applied to walls, floors, ceilings, and roofs. SPF is suitable for insulation and has a high strength-to-weight ratio, making it an excellent material for building projects.

Additionally, closed-cell spray foam has a high density, which makes it more durable than other types of insulation. It is also highly durable, making it an ideal choice for areas that experience a lot of wear and tear. It is also resistant to mold and mildew, making it a good choice for areas where moisture is present. Spray foam insulation is an effective way to insulate your home and can provide many years of use.

Closed-cell spray foam on a wall

How does Closed-cell spray foam insulation work?

Spray foam insulation is an insulation type that is made of foam that is sprayed onto a surface. It is created by pouring a foam made of two liquids, polyol and isocyanate, onto a surface. When the liquids are combined, they spray foam onto a surface. The foam then dries and hardens, creating a thermally resistant barrier. 

Spraying to Ceiling Closed Cell Foam

Thermal resistance is a measure of a material’s ability to conduct heat. The higher the material’s thermal resistance, the less heat will flow. This is why it is so effective: it has a very high thermal resistance, which prevents heat from flowing through the insulation in your home. As a result, insulation can help keep homes more relaxed in the summer and warmer in the winter, saving homeowners money on their energy bills.

Types of Spray Foam Insulation

Spray foam insulation comes in two main types: open cell and closed cell.

  • Closed-cell foam is the most common spray foam type. It is made up of closed, tightly packed cells filled with a gas that helps the foam grow. This type of foam is more effective at insulating and keeping air and moisture from leaking through cracks in your home than open-cell foam.
  • Open-cell spray foam has cells that aren’t completely sealed so that some air can get out. Because of this, open-cell spray foam insulation is less dense than closed-cell foam and has a lower R-value, or measure of insulation. But it is more versatile and can be used in various situations.
Spray foam types

It’s essential to think about what your home needs when using spray foam insulation. For example, if you live in a place with extreme temperatures, choose a type of foam with a higher R-value.

Why is the R-value Insulation Important?

The R-value of spray foam insulation shows how well it keeps heat in. In simple terms, the better the insulation properties of spray foam insulation are, the higher the R-value. It is also used in plumbing and HVAC systems. The spray foam is a good choice for places that don’t get very hot or cold.

How to Calculate the R-value of Closed Cell Spray Foam Insulation

If you’re looking for an effective and cheap way to insulate your home, closed-cell spray foam insulation is the way to go. Polyurethane spray foam is used to make this insulation, which is sprayed on the walls, ceilings, and floors of your home.

It’s essential to know the R-values of any insulation you’re considering, and luckily, it’s pretty easy to figure out the R-values of open-cell spray foam. Closed-cell spray foam has a 6.5 R-value per inch. To calculate the r-value of spray foam insulation, multiply the insulation thickness by 6.5 per inch.

For example, if the spray foam insulation is two inches thick, the insulation’s r-value would be 13.

Is Closed-cell Spray a Good Insulation?

When it comes to insulating homes and commercial buildings, it is quickly becoming the preferred choice. Spray foam is easier to use than other types of insulation because it can be put on a wide range of surfaces. Also, it makes a smooth barrier that helps stop air and water from leaking. As a result, spray foam effectively helps to keep commercial buildings warm in the winter and cool in the summer.

Spray Closed cell foam

Spray foam insulation also has a high R-value, which means it is very good at keeping heat from moving through it. This makes it an ideal choice for commercial buildings requiring high insulation. Finally, closed-cell is durable and will not settle over time like traditional insulation materials. This makes it an ideal choice for commercial buildings that require long-term insulation.

Advantages of Closed cell Spray Insulation

When it comes to insulation, it offers several benefits compared to open-cell insulation. For starters, it is more energy-efficient, which will help keep your home or business cooler in the summer and warmer in the winter. It is one of the most popular types of insulation on the market today. There are many reasons for this, but the two most important are that it is highly effective and durable.

  • It does a great job of sealing a cavity so air and moisture can’t get in or out.
  • It has a higher R-value than other types of insulation, making it an ideal choice for use in areas with higher thermal protection.
  • Provide an effective barrier against heat and cold, making it an ideal choice for many applications.
  • Very strong and durable, meaning it will not settle over time or be easily damaged. This makes it an excellent choice for use in areas with a risk of moisture or impact damage.
  • Better at blocking noise than open-cell insulation makes it the best choice for places where noise is a problem.
  • It is more resistant to water and mold growth, making it an ideal choice for areas susceptible to moisture.
Advantages of Spray Foam

Drawbacks of Closed Cell Spray Insulation

  • More expensive than other types of insulation, making it a less attractive option for many homeowners.
  • Finding contractors who are adequately trained to install it is challenging.
  • The foam is dense; it can be challenging to add or remove electrical wiring or plumbing after the fact. 
  • It can be toxic if inhaled. It can also cause skin irritation and is known to cause asthma attacks in some people.
  • Closed-cell spray foam insulation is a fire hazard.
  • It can also lead to moisture problems and promote the growth of mold and mildew.

Where can you use Closed Cell Spray Insulation?

Closed-cell spray insulation is a versatile product that can be used in many situations. Closed-cell spray insulation is a great way to improve your home’s energy efficiency or make it more comfortable. It can be used as a continuous layer of insulation inside walls, in attics, and outside.


Attics can be one of the most significant sources of heat loss in your home during the winter, and they can also be a significant source of heat gain during the summer. Closed Cell insulation provides an effective barrier against heat loss and gain, helping keep your attic temperature consistent year-round. In addition, it can also help reduce noise transmission from the attic, making it a quieter and more comfortable place to spend time.

Closed Cell Spray Foam to Walls


Closed cell spray insulation is one of the most effective ways to insulate your walls and prevent heat loss. The closed cells create a barrier that prevents heat from escaping, and the spray insulation helps to fill in any gaps or cracks in the walls. In addition, it is also resistant to moisture, mold, and pests, making it an ideal choice for protecting your home. When appropriately applied, closed cell spray insulation can provide high energy efficiency and help you save money on your energy bills.


Closed cell spray insulation is one of the best ways to insulate your basement. It’s easy to apply and provides a high R-value, which means it will keep your basement warm in the winter and cool in the summer. It also helps to reduce drafts, noise, and odor. In addition, it is highly effective at preventing moisture from penetrating your basement walls. As a result, it’s an excellent way to protect your basement from mold and mildew.

Where should you not use Closed Spray Insulation?

Although closed-cell spray insulation is versatile, there are some places where it should not be used.

  • Closed spray insulation is not recommended around electrical wiring. The insulation can create a fire hazard if it comes into contact with live wires.
  • Closed-cavity spaces that get a lot of light are not good candidates for closed spray insulation because the light will cause the closed spray insulation to break down over time, making it less effective. 
  • It should not be used in areas with a potential for water leaks. The insulation can trap water inside walls, leading to mold growth and other problems, and is best used in dark, cold, and dry spaces.
  • It should not be used on ceilings if there is a risk of condensation build-up. If the insulation gets wet, it can sag and fall, creating a safety hazard.

How to Install Closed Cell Spray Foam?

It is typically recommended to hire an insulation contractor. However, it’s relatively easy to install, and most do-it-yourselfers can do it with minimal experience. Here are the basic steps for installing spray foam insulation:

  • Choose the correct type of spray foam Insulation for your needs. Remember to select closed-cell spray, which provides a better barrier against heat and cold.
  • Measure the area to be Insulated and calculate the amount of Insulation required. When measuring, include all nooks and crannies where insulation will be needed.
  • Clean the surface to be Insulated. This will help the Insulation adhere better and create a seal free of defects.
  • Using closed-cell spray foam Insulation, mix the two ingredients (the resin and the activator) together according to the manufacturer’s instructions.
  • Apply the Insulation evenly to the surface, careful not to overshoot or undershoot areas. If using closed-cell spray foam Insulation, apply it in two passes – one horizontal and one vertical – making sure to overlap each pass by about half an inch. Once all the Insulation has been applied, use a utility knife to trim away any excess material.
  • Allow the Insulation to cure for the amount of time specified by the manufacturer before proceeding with any other construction projects in the area. Curing times vary depending on temperature and humidity levels but typically range from 24 to 72 hours.

Closed-cell Spray Foam

How long does Closed Cell Spray Insulation last?

Regarding home insulation, closed-cell spray foam is one of the most popular options on the market. Not only does it provide outstanding thermal protection, but it also helps to reduce drafts and minimize noise transfer. But how long does closed-cell spray foam insulation last?

When appropriately installed, closed-cell spray foam has an estimated lifespan of 80 years. It is also resistant to fire, mold, and pests, making it a long-lasting choice for your home. So if you’re looking for an insulation option that will stand the test of time, closed-cell spray foam is an excellent choice.

What are the Alternatives to Closed-cell Spray Foam?

When it comes to insulating your home, there are many different options to choose from. Some homeowners choose traditional insulation like fiberglass, while others prefer spray foam or more modern options. However, spray foam has come under fire recently due to its potential health risks. So what are the alternatives?

  • Fiberglass: Fiberglass insulation is a common insulation type that is made of glass fibers. It’s cheap and easy to put up, and it does an excellent job of insulating against heat and noise. But fiberglass is hard to work with and doesn’t insulate as well as spray foam.
  • Cellulose: Cellulose is another type of insulation made from recycled paper. It’s good for the environment and does a great job of keeping the heat in. But like fiberglass, cellulose is hard to work with and doesn’t work as well as spray foam.
  • Mineral wool is the insulation that is made by melting minerals. It doesn’t catch on fire and is good at insulating against heat and sound. But it costs more than fiberglass and cellulose and can be hard to put together.

Instead of open-cell spray foam, you can use different kinds of insulation. Each has pros and cons, so it’s essential to choose the right one for your needs.