Getting Started: Understanding the Difference Between Roll and Batt Insulation
Batt and roll insulation are both types of blanket insulation, named so because they cover surfaces like a blanket when installed. While they are similar in many ways, the main difference lies in where they are typically used. The information below will help you understand their use cases.
When installing insulation, always follow the manufacturer’s instructions. This includes wearing the proper safety gear, like eye protection, work gloves and a respirator. For help with the installation process, see our step-by-step article. For more general information about insulation types, see our buying guide.
What Is Batt Insulation?
Batt insulation comes in pre-cut sections or strips of blanket insulation, which are designed to fit snuggly between structural framing such as wall studs and joists. It’s typically made from fiberglass, mineral wool or stone wool. Batt insulation is also available with or without an aluminum foil or paper facing, which functions as a moisture barrier. Depending on your project, you can choose from the following types of batt insulation:
In terms of R-value, which measures how well insulation retains heat, batt insulation usually falls between R-2.9 and R-3.8 per inch, but some products can have a value as high as R-4.3 per inch. To learn more about R-value, refer to our related article on the subject.
What Is Roll Insulation?
Roll insulation is similar to batt insulation and can be faced or unfaced, but it comes in longer lengths, making it better suited for large surface areas. It’s typically used to insulate subflooring, walls and ceilings. Rolls usually come in lengths ranging from 20 to 40 feet. Types of roll insulation include:
When it comes to R-value, standard roll insulation offers ranges between R-2.9 and R-3.8 per inch of thickness — the same as batt insulation. Some types can also reach up to R-4.3 per inch.
Choosing the Right Insulation: The Bottom Line
- Batt and Roll Insulation Differences: Mainly in size and where it is applied
- Typical R-value range: R-2.9 to R-3.8 per inch, with some up to R-4.3
- Batt Insulation: Comes in pre-cut sections designed to fit between studs and joists
- Roll Insulation: Comes in long rolls (20–40 feet) for covering larger areas and is often used in subflooring, walls and ceilings
