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The Ultimate Guide To Roof Insulation: R-Values, Product Ratings & More!

Posted on June 26, 2023

The Ultimate Guide To Roof Insulation: R-Values, Product Ratings & More!

The Ultimate Guide To Roof Insulation: R-Values, Product Ratings & More!

Get ready to learn all about insulation and make your home feel like a cozy fortress! In this blog post, we’ll uncover the secrets to maximizing energy efficiency and the comfort of your home. Whether you’re battling scorching summers or freezing winters, understanding R-values, product ratings, and other vital information about roof insulation is your ticket to an enjoyable and cost-effective living space. Get ready to know all there is about insulation and take control of your home’s climate like never before. 

What Is Roof Insulation?

Your roof protects your home from the scorching sun, icy cold, and relentless rain. But alone, the roofing material is not enough, you need insulation to help bolster the protective effects of your roof.

Roof insulation is like a secret weapon that keeps your home comfortable all year round. It’s a magical layer that fights off unwanted heat during blistering summers and keeps the cozy warmth inside during frosty winters. Because of its temperature-regulating abilities, your heating and cooling systems will not have to work as hard, saving you money on your energy bills. 

Insulation comes in different forms, from fluffy-looking fibers to thick foam boards. Each type has its own special abilities, like blocking out noise pollution or resisting fire. It’s like assembling a team of incredible materials to defend your home from all threats!

If you’re unsure of where to start, don’t worry, we’ve got you covered with all the insider knowledge. From R-values to product ratings, we’ll guide you through any decisions regarding roof insulation.

By tapping into the magic of roof insulation, you can put a big dent in your energy bills. Plus, it’ll help you maintain a comfy climate inside your house, no matter the season. So, gear up to kick your home’s energy efficiency up a notch with a little help from roof insulation!

What are the different types of roof insulation?

#1 Spray-Foam Insulation 

Spray foam insulation is a type of insulation that is applied as a liquid and then expands to fill the space it is sprayed into. There are two main types of spray foam insulation: open-cell spray foam and closed-cell spray foam.


The cost of spray foam insulation varies depending on the type, thickness, and size of the area being insulated. The average cost of open-cell spray foam insulation is $0.45 to $0.75 per square foot, and the average cost of closed-cell spray foam insulation is $1.00 to $1.60 per square foot.


The R-value of spray foam insulation also varies depending on the type. Open-cell spray foam has an R-value of R-3.6 to R-3.9 per inch, and closed-cell spray foam has an R-value of R-5.5 to R-7 per inch.

Spray-Foam Insulation 
Spray-Foam Insulation 

#2 Loose-Fill Insulation

Loose-fill insulation is a type of insulation that is made of small, lightweight particles that are blown into the space to be insulated. Several types of loose-fill insulation include cellulose, fiberglass, and spray-on foam. 


Like spray foam insulation, the cost of loose-fill insulation varies depending on the insulated area’s type, thickness, and total square feet. The average cost of cellulose insulation is $0.35 to $0.50 per square foot, for fiberglass insulation, it is $0.40 to $0.60 per square foot, and on average spray-on foam insulation is $1.00 to $1.50 per square foot.


The R-value of loose-fill insulation ranges from R-3 to R-7 per inch, depending on the specific type chosen. Cellulose insulation has an R-value of R-3.5 to R-4 per inch, fiberglass insulation ranges between R-2.5 and R-3.5 per inch, and spray-on foam insulation has a higher average R-value of R-6 to R-7 per inch.

Loose-Fill Insulation
Loose-Fill Insulation

#3 Foam Board Insulation

Foam board insulation is a type of insulation that is made of rigid foam panels. It is available in a variety of thicknesses and R-values and can be used to insulate walls, attics, and other areas of the home. Two main foam board insulation types are expanded polystyrene (EPS) and extruded polystyrene (XPS). 


The total price of foam board insulation will depend on a number of factors, including the type, size of the boards, and the area being insulated. The average cost of an EPS foam board is $0.50 to $1.00 per square foot, and the cost of an XPS foam board is a bit more, around $1.00 to $1.50 per square foot.


For XPS foam board insulation, the R-value ranges from R-4.0 to R-5.2 per inch, while EPS foam board insulation has an R-value that ranges from R-3.8 to R-4.2 per inch. Keep in mind that if the thickness of the foam board is increased, the R-value will increase significantly for each as well, and better insulate a home. 

Foam Board Insulation
Foam Board Insulation

#4 Reflective Insulation

Reflective insulation, also known as radiant barrier insulation, is a type of insulation that reflects heat back to its source. It is made up of a reflective material, such as aluminum foil, sandwiched between two layers of insulation, such as bubble wrap or foam. Reflective insulation is available in many thicknesses and R-values. There are two types of reflective insulation: bubble and foam core reflective insulation.


Out of the two kinds of reflective insulation, bubble wrap reflective insulation is cheaper, costing between $1 and $2 per square foot, whereas foam core reflective insulation can cost between $2 and $5 per square foot.


Similar to the overall cost, bubble reflective insulation, which has a lower price tag, has a lower R-value of R-1 to R-2 per inch. Foam core reflective insulation has an R-value between R-2 and R-4 per inch, and will cost you more.

Reflective Insulation
Image Source: Reflective Insulation

#5 Batt/Blanket Insulation

Batt, or otherwise known as blanket insulation, is a type of insulation that is commonly used to fill the spaces between rafters and ceiling joists. It helps to improve the thermal efficiency of homes by reducing heat transfer from the roof. Batt insulation is available in various materials, including fiberglass, mineral wool, and natural fibers like cotton or sheep’s wool.


The cost of batt insulation depends on factors such as the material used, the thickness of the batt, and the size of the area to be insulated. Fiberglass batts are typically more affordable, ranging from $0.30 to $1.50 per square foot. Mineral wool batts may cost slightly more, averaging around $1.40 to $2 per square foot. Natural fiber batts can be more expensive, with prices ranging from $0.95 to $2.87 per square foot.


The R-value of batt insulation determines its thermal resistance. Fiberglass batts typically have an R-value of R-3.2 to R-3.8 per inch. Mineral wool batts offer a higher R-value range of R-3.5 to R-4.3 per inch. Natural fiber batts can vary in their R-value but commonly range from R-3.2 to R-3.8 per inch.

It is important to note that proper installation of batt insulation is crucial to achieve optimal performance. Ensuring a snug fit and eliminating gaps or compression will help maximize the insulation’s effectiveness in reducing heat loss or gain within the walls of a building.

Batt/Blanket Insulation
Batt/Blanket Insulation

Things To Know Before Starting Your Project

Here is an overview of some things to know before deciding on a contractor to handle your insulation.

  • Get multiple estimates from different contractors. The cost can vary depending on the type of insulation and the size and location of your home.
  • Make sure the contractor is licensed and insured. This will protect you if there is any damage to your home during installation.
  • Ask about the contractor’s experience with installing insulation in your climate. This will ensure the insulation is installed correctly and will provide the best possible energy efficiency. 

The contractor you hire should also be aware of the local building codes regarding insulation in your area. These building codes can change, so it is always best to check with your local building department before installing any type of insulation.

Hire The Best Contractor for Insulation Installation

Your roof is your home’s first line of defense against the elements, but it needs some help. Roof insulation helps your home regulate temperature, saving you money on your energy bills and making your home more comfortable overall.

There are two ways to install roof insulation: you can do it yourself or hire a contractor. If you’re handy and have the time, DIY roof insulation can be a cost-effective way to improve your home’s energy efficiency. However, it’s important to research and ensure you’re using the right materials and techniques. Hiring a professional is best if you’re uncomfortable tackling this project alone or have a large or complex roof.

If you’re looking for a reliable roofing and construction contractor, consider contacting Renova Roofing & Construction. We offer a wide range of services and can provide you with expert advice on roof insulation. Call us today at (601) 647-3433.