Tuesday, May 19th, 2020 by Emma Niemi
If you're considering ways to improve your home's energy efficiency, you've probably come upon the term "R-value." Well, what does "R-value" actually mean? Look no further; we have you covered.
Simply put, the R in insulation R-value indicates the resistance of heat transfer through the insulation.
The higher the R-value, the greater the thermal performance. The R-value depends on the type of insulation, its thickness, and its density. The more resistant, the longer it takes for heat to flow out of the room through the insulation.
R-value is calculated by using the following formula:
R-Value= (Temperature Difference x Area x Time) / Heat Loss
R-value is calculated per inch of width.
For example, blown fiberglass installed in the attic has an R-value of 2.2 per inch, so 12 inches of it would give you an R-value of 26.4 in your attic installation project.
The R-value of insulation is important. One factor to consider is that it doesn't matter how high your insulation's R-value is if cold air is leaking through cracks and gaps. This can lessen the effectiveness of your insulation. Therefore, it is best practice to seal any cracks and gaps before insulating the space.
Another factor to consider is the environment you live in. Naturally, the colder your climate, the more insulation you'll need. Here in Wisconsin, we live in zone 5 to 8. Here is a map of climate zones and R-value chart by zone.
Are you looking to improve your home's energy efficiency or just have questions? We can help. Give our team of experts a call at 1-844-385-7693.