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FAQ About Home Insulation in Southern California

Welcome to Blown In Insulation Pros’ FAQ about home insulation in Southern California! Home insulation is an important part of keeping your home comfortable and energy efficient, and this article will answer some of the most asked questions about the process. We hope to provide you with all the information you need to make an informed decision about the best home insulation for your Southern California home.

What is the best insulation for Southern California walls and ceilings?

Fiberglass is the most widely used form of insulation in homes, and for good reason – it is exceptionally effective, especially in warmer climates. It is the preferred choice for many homeowners, as it has a number of advantages that other types of insulation simply cannot match. Not only does it provide superior thermal protection, but it is also easy to install and cost-efficient. Fiberglass insulation is a smart, long-term investment that can help keep energy bills down and protect against the elements, making it an ideal choice for all types of residences.

What is the best attic insulation?

Fiberglass blown in insulation is considered to be the top-of-the-line insulation for attics. Compared to other insulation materials, its installation process is simple, cost-effective, and time-efficient. Moreover, fiberglass blown insulation is incredibly energy efficient, as it is designed to effectively slow the movement of hot and cold air, thus helping to maintain a more consistent temperature in the home.

What is the required R-value of walls in California?

This EnergyStar chart can be incredibly useful when it comes to making sure your home’s insulation meets the standards for your area. In Sacramento and most of California, we are classified as Zone 3, meaning that attics should have an insulation R-value of between 30 and 60. This chart divides the United States into different zones and provides a recommended R-value for each one.

What is the recommended R-value for Southern California?

Homes in California should strive to have an attic insulation with an R-value of between R-30 and R-60. While many other states require an insulation R-value higher than R-30, R-60 is generally recommended as the highest for any area in the country.

Is a vapor barrier necessary in Southern California?

We need vapor barriers in California Climate Zones 14-16, which are areas of the United States that experience an increased amount of humidity and precipitation. In some climate zones, an air barrier is used to prevent water vapor from entering the building and should be installed if the building’s exterior is made from absorbent material. Furthermore, a vapor barrier is likely necessary if the structure is located in United States climate zones 4C, 5 through 8, as these climate zones are particularly prone to high levels of humidity.

Is R60 too much insulation?

Depending on the area you live in, you will need a certain amount of attic insulation to keep your home comfortable. In areas where temperatures are hot for most of the year, insulation with a value of R30 to R60, with an average of R38, is recommended. On the other hand, those living in colder climates should opt for insulation with a value of R49 to R60, to protect against extreme cold. This insulation will help keep your home comfortable and energy efficient all year round.

Which is better attic insulation blown or rolled?

If you’re looking for insulation for your home, your environmentally-minded family members will likely appreciate the benefits of blown fiberglass insulation. With an R-value of 3.2 to 3.8, it’s slightly more effective than rolled fiberglass insulation in preventing heat from entering and leaving your home, and it can help you reduce your energy costs in the long-run. Plus, blown fiberglass insulation is made of recycled materials, making it a great option for reducing your carbon footprint.

How many inches of insulation is good in the attic?

It’s important to ensure your attic is properly insulated for optimal energy efficiency. To achieve this, we recommend that you aim for an insulation level of R-38, which translates to 10 to 14 inches of insulation, depending on the type of insulation you choose.

Attic Insulation Alone Can Save 40-60% on your Energy Bill

Attic insulation being installed.

RELATED POST: 7 Ways Blown in Attic Insulation Keeps Out the Heat in Southern California.


Can insulation R-value be too high?

Yes – insulation in a vented attic can certainly be beneficial, especially in colder parts of the United States. However, if you live in the temperate Southern California region, you should be mindful of how much insulation you install. An R-Value of 38 is more than enough for most of the United States, but if you live in Southern California, an R-Value of 30 to 38 is the ideal solution.

Does higher R-value mean better insulation?

Understanding the R-value of your home’s insulation is key to keeping your energy bills low. The R-value measures how well insulation can keep the heat inside during winter and cool air inside during summer. The higher the R-value, the better the insulation performance and the more you can save on your energy bills. You’ll be able to enjoy a comfortable home temperature all year round, while keeping your energy costs down. So make sure to check your home insulation’s R-value and see if you can increase it for even more savings!

Do I need plastic over my insulation?

If you’re looking to add an extra layer of protection to your walls, ceilings, and floors during the cold winter months, a vapor retarder, also known as a vapor barrier, may be the perfect solution. Not every wall needs one, but it can help prevent water vapor from seeping in and potentially causing damage. Installing a vapor retarder is relatively straightforward and can be a great way to keep your home safe and comfortable all winter long.

Can I put too much insulation in my attic?

Making sure your home is well insulated is important for keeping the temperature comfortable, saving energy, and keeping your energy bills low. However, if you have too many layers of insulation, moisture can build up and cause mold to form. This can be an unhealthy and expensive problem to deal with, so it’s important to make sure your home isn’t over-insulated. Be mindful of the insulation materials you use, and if you’re not sure, reach out to an experienced insulation specialist for advice. They can help you determine the best insulation materials and techniques to create a well-sealed, breathable interior.

Blown Insulation on an attic insulation project in Covina.
Blown Insulation on an attic insulation project in Covina.

RELATED POST: What Homeowners Should Look for in an Insulation Contractor in Southern California.


How often should blown-in attic insulation be replaced?

Attic insulation can last up to 8 decades, but even the best insulation can start to lose its energy efficiency over time. To make sure your insulation is doing its job of keeping your home energy efficient, certified attic specialists recommend upgrading it every 15-25 years. This way, you can be sure that your insulation is working hard to keep your home as comfortable and energy efficient as possible!

Should you replace old blown-in attic insulation?

It’s important to maintain the insulation in your home for a comfortable atmosphere, lower utility bills, and to keep pests away. Unfortunately, insulation can get damaged over time due to water damage, wind, or compression. When this happens, it’s wise to supplement your current insulation with new insulation or replace it entirely. Doing so will help ensure that your home stays warm and cozy year-round, while also keeping your energy bills low and keeping pesky critters out.

Can you put insulation over old insulation?

If you’re looking to add insulation, in many situations you can layer new insulation on top of existing insulation. However, if the old insulation is wet, moldy, or vermiculite, it’s best to remove it first. Even if the old insulation appears to be dry, it’s possible it was previously wet. In that case, it’s important to identify and fix the root problem before adding new insulation.

How do I know if my attic has enough insulation?

If you take a look around your attic, you’ll want to check to see if the insulation lines up with your attic floor joists. If the insulation is at or below the joists, that means you could benefit from adding more insulation. We recommend using insulation with an R-3 rating per inch for the best protection. Now, if you can’t even see the joists because the insulation is so high, you may already have a sufficient amount and adding more insulation may not be worth the cost.

Are baffles in attic necessary?

If you have a home with both traditional and vaulted ceilings, you need to make sure you’re utilizing vented roofs to ensure your attic stays healthy and well-ventilated. Vented roofs feature: closed eaves, where the rafters are enclosed and vented through soffits; ridge vents at the apex of the roof; and gable vents on the flat area between the roofline and the exterior walls. Installing attic baffles helps to provide proper air circulation in the attic, which is an essential part of maintaining a safe, healthy home.

Does insulation get worse over time?

Over time, your home’s insulation isn’t immune to the effects of weather, critters, and general age. But don’t worry, there are ways to figure out when it’s time to replace your insulation. Depending on the type of insulation in your home, you can expect it to keep your home warm and comfortable for several decades. It’s important to stay on top of your insulation, so you can enjoy the energy-saving benefits it provides for years to come.

What is the best R-value per inch?

Are you looking for a way to maximize the energy efficiency of your home? Vacuum insulated panels offer the highest R-value of any insulation option, with approximately R-45 (in U.S. units) per inch. Aerogel is another great option, coming in at a close second with R-10 to R-30 per inch. Polyurethane (PUR) and phenolic foam insulations are also great choices, with an R-value of R-7 per inch. Finally, blown in fiberglass insulation has a rating of 3.2-4 per inch. With so many insulation options available, you’re sure to find one that meets your needs and fits your budget.


How many inches of blown insulation is R38?


Fiberglass Chart



Bags / 1000 Sq Ft














What are the disadvantages of attic insulation?

Have you been thinking of insulating your loft? It’s a great way to keep the heat in your living space and make it cooler. However, please bear in mind that insulation can also cause condensation and dampness in the attic, so if you’re planning on installing it yourself, it’s important to make sure you increase ventilation. This will help ensure that your loft space stays dry and healthy!

Should attic roof be insulated?

Adding proper attic insulation is not only good for you, but it’s good for your roof too! By having good insulation, you can help prevent ice dams and condensation from forming. While your local building codes may require you to have a certain quality of insulation, it may be beneficial to install even better insulation. This can help prolong the life of your roof, saving you time and money in the long run. Investing in good attic insulation is a smart move, and one that will pay off in the future.


Does insulation in the attic keep heat out?

Having an uninsulated attic in the summer months can be a real problem, as the heat radiating from the top of your home can cause the rest of your house to become uncomfortably hot. Fortunately, insulation is the perfect solution, not only reducing the amount of heat that builds up in the attic, but also preventing it from transferring to the lower floors. In fact, installing insulation in your attic can result in an energy savings of 20-60%!


What time of year is best for attic insulation?

The fall and spring are the perfect times of year to think about insulation for your home! By taking the time to insulate before the peak of summer and winter, you can start to reap the rewards of energy savings right away. Not only that, but you’ll also enjoy the peace of mind that comes with having your home adequately insulated and ready to face the hottest and coldest temperatures of the year. Investing in insulation now will pay off in the long run!


What is the best insulation for older homes?

Upgrading your insulation is a great way to improve the comfort of your home, reduce your energy bills, and maintain a healthy living environment. If you own an older home, you may be looking for the most cost-effective and efficient method of insulation. 


Spray foam, batt or blown in insulation are all suitable options for older homes. Blown in insulation is particularly effective for older homes because it creates an air seal, blocking out drafts and helping to maintain a comfortable atmosphere. This type of insulation is usually more affordable than other options and relatively easy to install. It is also beneficial for the environment as it is typically made from recycled materials.


When choosing insulation for your home, it is important to consider your home’s existing structure, climate, and budget. If you have an older home and are looking for an effective and affordable insulation, then blown in insulation is an excellent choice. It will create an air seal and help to create a comfortable and healthy living environment.

Did you know Blown In Insulation Pros, average quote is 30% lower than the next competitors insulation quote?

What are the disadvantages of blown-in insulation?

Although professional installation of this type of insulation is required, it can be a messy process. Not only that, the weight of the cellulose can put pressure on your ceilings, potentially causing sagging. Additionally, if the insulation gets wet, it can lead to fungal growth, which can be a major issue. To avoid all of these problems, it’s important to make sure the insulation stays dry.


How long does it take to remove blown-in insulation from attic?

If you’re wondering how long it might take to professionally remove blown-in insulation from your 1,500-square-foot attic, the answer is usually 4 to 6 hours. Of course, this timeline can vary depending on the complexity of the job, but in general, you can expect professional removal to be completed in a relatively short amount of time. If you’re looking for a smooth, hassle-free experience, relying on a team of professionals is the way to go. They’ll make sure the job is done quickly and efficiently, and that any hazardous materials are properly handled and disposed of. With their help, you can have your attic insulation removed in no time!


Does blown-in insulation settle in the attic?

When you choose the new types of blown-in insulation, you can rest assured that it won’t shift or settle over time. These insulation materials are designed to remain in place for years to come, providing you with a long-term solution for keeping your home or business comfortable and energy-efficient. Not only does this insulation require minimal maintenance, but it also helps to reduce energy costs and create a healthier indoor environment.


How can you tell if insulation is bad?


8 Signs Your Home is Under Insulated

  1. Inconsistent Household Temperatures. …
  2. Energy Bills Are High. …
  3. Your Walls and Ceilings Are Cold to The Touch. …
  4. Issues with Pests. …
  5. Water Leaks. …
  6. Pipes Freeze on a Regular Basis. …
  7. Ice Dams. …
  8. Drafts.


What is the life expectancy of attic insulation?

The average lifespan of attic insulation is about 20-25 years, but this can be shortened due to a variety of factors. The climate of your region, ventilation, and pests can all contribute to the breakdown of attic insulation over time. If you happen to live in an area with extreme temperatures or high humidity, it’s likely that your attic insulation won’t last as long as expected. Therefore, it’s important to take the necessary steps to ensure the insulation in your attic is protected and remains in good condition for as long as possible.

fiberglass loose fill blown in insulation
fiberglass loose fill blown in insulation

Can you put 2 layers of insulation in attic?

Considering insulation for your attic? For optimal insulation, we recommend installing two layers. The first layer should be placed between the wood joists to allow air to move freely. This layer should also have a facing against the drywall to act as a vapor barrier. The second layer should run perpendicular over the joists. For a more thorough option, you may opt for blown in insulation, which eliminates any gaps and seals the attic perfectly. Installing two layers of insulation in your attic will help keep your home well insulated, so you can enjoy it for years to come.


What should a properly insulated attic look like?

Having adequate insulation in your attic is essential for ensuring that your living space stays comfortable and energy efficient. If you can spot joists in your attic, it likely means that your current insulation isn’t sufficient. Joists are the horizontal wood framing members that form the bottom of roof trusses and the top of your ceiling. To make sure that your attic is properly insulated and that the joists are not visible, consider adding extra insulation to your attic so that your living space remains comfortable and energy efficient.


How do you tell if attic is properly vented?

If it feels like the temperature in your attic is higher than the temperature outside, it could be a sign that your attic needs better ventilation. Have a look at your eaves and roof. On a warm, sunny day, touch your ceiling to see if it feels much warmer than the outside temperature. If you notice thick ridges of ice on your eaves during the winter, it’s a sure sign that your attic ventilation needs to be improved. Not only does warm air that escapes from your living space cost you money, but it can also carry moisture that will condense on rafters or roof sheathing, leading to problems like mold. If you suspect your attic needs better ventilation, it’s best to consult a professional to determine the best solution.


Is blown insulation better than batt?

Using blown-in insulation is a great way to help the environment while also improving the energy efficiency of your home. The insulation is composed of mostly recycled materials such as cellulose, which is generally made from recycled newspaper, and fiberglass, which is usually made from glass or mineral wool. Blown-in insulation is also great for irregularly shaped areas as it can be easily applied to any area. So, if you’re looking for an eco-friendly and efficient insulation solution, you should definitely consider blown-in insulation!


Will insulating attic keep house cooler?

Yes, insulating your attic is an effective way to keep your home cooler during those hot summer months. Not only will the insulation help keep your home warm during the winter, but it can also be just as helpful in keeping the temperature inside your home comfortable and cool during the summer. By trapping the cool air inside your home and preventing it from leaking out, insulation can help reduce your need for an air conditioner. Additionally, by trapping the hot air from outside and preventing it from entering, insulation can also help reduce the amount of heat that you experience inside your home.


In summary, home insulation is an important part of keeping your home comfortable and energy efficient. By researching the most FAQs about home insulation in Southern California, you can make sure you get the best product for your needs. For more information about home insulation, or to get a quote from Blown In Insulation Pros, contact us today for a free consultation. With our expertise and experience, we can help you find the most suitable and cost-effective insulation solution for your home.

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Whether it is a residential or commercial property, whatever your insulation needs are, Blown - In Insulation is the insulation contractor you want! Contact Brad today for more information on our services, and don’t forget to ask for your free quote! Phone: (626) 696-6042 ‍ Service Area: Southern California

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