NEWARK Blog

A Guide to R-Value

People often enjoy the warmth of their homes in the winter and their coolness in the summer without giving much thought to how it stays that way. However, without adequate insulation, temperatures would fluctuate greatly. R-value measures how well a building’s insulation prevents climate-controlled air from leaving the home and outside air from entering. The higher the R-value, the more efficient the product is at preventing air transfer. Here’s how to determine whether your home has a sufficient R-value.

How Is It Determined?

When R-value is tested in a lab, one square foot of material an inch thick is placed between two plates. The heat flow through the material is then measured by creating a one-degree temperature differential and analyzing how quickly the heat is transferred. This metric is measured in British thermal units (BTUs) per hour. The higher the number, the more effective the insulation.

In the field, energy efficiency professionals use a device such as a thermal imaging camera to identify air transfer and gauge R-value. Different types of materials have varying R-values. Insulation blankets, including batts and rolls, have some of the highest values, while spray foam offers slightly less. Each type also has unique benefits. For instance, spray foam is a popular choice for attics converted into living spaces since it offers soundproofing and moisture resistance. Batts and rolls can be installed easily in attics used for storage, as there is typically no drywall to get through.

How Much Should You Have?

The R-value that your home needs will depend on your region's climate. For example, residents in the South may only need an R-value of 38 to maintain a comfortable indoor climate and control air transfer. In the Northeast, an R-value of at least 49 is recommended to help fight air transfer during periods of bitter cold.

You can determine whether your home has sufficient insulation by checking its depth. It's easiest to measure the depth of the material in the attic, where it's typically installed between two joists. Older homes generally only have four to seven inches of insulation. However, for Northeastern homes, 16 to 18 inches of insulation is recommended. If you want to ensure that your home is adequately insulated, turn to Koala Insulation of Newark. Serving New Castle County, DE, this home efficiency company helps homeowners make their homes more efficient and comfortable throughout any season. Explore their guide for choosing the right insulation online, or discuss your home’s needs by calling (302) 273-8476.