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What Is R-Value vs. Effective R-Value?

Posted September 1, 2015

When you are trying to figure out what kind of insulation to add to your crawl space, there are many factors that you should consider. One of the most important ones is the R-value of different insulations. Before you settle on the material you want to use for your crawl space insulation near the greater Seattle area, you should try to choose one that has a higher R-value because it will help you insulate your home better.

Why R-Value Is Important

R-value is a measurement used in the insulation industry that reveals the thermal resistance of a material like fiberglass or foam insulation. The higher the R-value, the better a material will insulate your home. The goal of all insulation is to trap hot air inside in the winter and cold air inside in the summer. Therefore, choosing a product with a higher R-value is what you need to do in order to make sure your home is comfortable at all times. Otherwise, you could be allowing air that you want inside your home to escape outside, which will cause your energy bills to skyrocket.

Why Effective R-Value Is Important, Too

The thing that you need to remember about the R-value of the insulation in your home is that it is not necessarily constant. It can be negatively affected by outside factors like moisture and can also decrease as a result of the age of your insulation. As your insulation becomes older, it can start to allow for more air flow, which will bring down the effective R-value of it. This may mean that you need to change the type of insulation in the crawl space of your home, or it may mean that you need to seriously consider re-insulating everything with fresh insulation.

The R-value and effective R-value concepts can be difficult to comprehend if you do not deal with insulation frequently. However, it is essential for you to choose an insulation based on the R-value. It will insulate your home better and save you money in the long run.