Insulation is an essential accessory to a metal building to help keep energy costs lower. Proper insulation will keep a structure warmer in the winter and cooler in the summer so that less cooling and heating system usage is necessary. Insulation is also essential to keep your structure up to building code, as the necessary R-value for the insulation needed is always specified.
Insulation comes in many different forms and is certainly not a one size fits all product. At Western States Metal Roofing, we’ve worked with thousands of contractors that have trusted us to supply the materials for their metal roofing and siding projects. We understand the importance of quality materials and choosing which products are best for each individual project. We want to make sure you understand your insulation options so you can choose which one is best for you.
In this article, we go over the top 5 insulations to consider for a metal roof or metal siding and their respective R-values.
An R-value, or the rating given to insulation that determines how well it can prevent heat from entering or leaving the building, determines the quality of the insulation.
Contributing factors to R-values are:
The higher the R-value, the better the quality of insulation. When we discuss insulation options below, we have ranked them from highest to lowest R-value.
The amount of insulation needed will depend on:
The more insulation that is installed will increase the R-value, which also increases the effectiveness of the insulation.
There are minimum R-value requirements for non-residential buildings. These requirements vary based on location. Be sure to consult your local building code to verify the minimum R-value needed for your state.
Spray foam insulation is a two-part liquid insulation material that foams to insulate where it is applied. It comes in both open-cell and closed-cell varieties and is a type of insulation that never sags or loses its shape over time. The insulation creates an air seal for cracks and gaps as well as large open areas like attics or pole barns.
Spray foam insulation comes in both open-cell and closed-cell foam. The open-cell is a more flexible material while the closed- cell is more stable and doesn’t allow moisture to penetrate through the insulation. While both successfully create an air seal, there are differences that could make one a better option for you than the other.
Open-cell spray foam:
Closed-cell spray foam:
Open-cell spray foam insulation has an R-value of R-3.0 -R-4.0 per inch.
Closed-cell spray foam insulation has an R-value of R-6.0- R-8.0 per inch.
Rigid board insulation comes in dense sheets that are very durable and resistant to natural elements. The chemical structure of rigid boards is considered to be “closed-cell” as opposed to “open-cell”. Closed-cell insulation generally has greater strength and durability due to its structure and does not allow moisture to pass through it.
Rigid Board insulation can be made from:
The R-value of Rigid Board ranges from R-4.0 – R-8.0 per inch.
Batt and blanket insulation is the most common type of insulation used in the United States largely because it is the most affordable type of insulation. This makes them a good choice for metal projects that are on a small budget. It is often fitted between joists, studs, and beams.
Batt insulation comes in pre-cut rectangular pieces while blanket insulation can be cut to fit the space you need to fill. Since blanket insulation is in roll form, it’s convenient when used in open areas without many obstructions so that it does not need to be cut.
Blanket insulation can be made from:
Blanket insulation has an approximate R-value of R-2.9 to R-3.8 per inch of thickness.
Loose-fill insulation is made up of small particles that are blown-in to the desired area with an industrial blower. Because of its installation process, loose-fill is also referred to as “blown-in” insulation.
Loose-fill can be used for tight spaces and any on any type of roof shape.
Loose-fill insulation can be made from:
The R-value of loose-fill insulation ranges between R-2.2- R-3.8 per inch of thickness. The range varies based on the material of the loose-fill.
For example, loose-fill fiberglass has an R-value of R-2.2 to 2.7 per inch, while loose-fill cellulose is R-3.2 to R-3.8 per inch.
Foil Bubble, or reflective foil, insulation is a lightweight and waterproof material that helps reflect radiant heat transfer in metal buildings. It’s made from enclosed bubble layers and is sealed with multiple layers of polyester.
The R-value of bubble insulation is between R-1.0- R-1.3 and are usually ⅜ of an inch thick or less.
Every building is unique and the best insulation to use will vary from project to project.
When deciding, consider factors such as:
When you’re ready to get started on your metal building project, we’ll help you decide which metal panel to use.
For a detailed overview of the different metal panel options, we recommend reading:
The 5 Best Metal Siding And Wall Panels. And What You’ll Pay.
Residential Metal Roofing Styles And Colors
Discover the differences between exposed and concealed fastener panels and which is best for you to use by watching this video: