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Insulation R-Value

Need to re-insulate your home? Not sure if you need insulation but tired of dealing with rising energy bills? Sick of dealing with drafty rooms and uneven temperatures inside your home? The right insulation solutions can help, but one question remains: how much insulation do you need?

The answer relates to the R-value and recommended levels. What is insulation R-value and what does it mean for you? In simple terms, the R-value stands for resistance, and it’s a basic measurement of an insulation material’s heat resistance.

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How Is Insulation R-Value Calculated?

Let’s start with an example: solid wood has an R-value of 1. An R-value is also calculated per inch of width. Therefore, a three-inch-thick board has an R-value of 3. 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.

Insulation professionals will be able to tell you how much insulation you need, based on:

  • What region you live in (see the map below)
  • What type of HVAC systems you have
  • The size of your home
  • Where you need to insulate
  • And more

One of the most important aspects is where you live.

What Are Recommended R-Values for the Washington, DC Metropolitan Area?

Insulation R-Value

Source: energystar.gov

Here in the DC area, we are in Zone 4. In wood-framed homes—for both new construction and retrofit projects—the insulation R-values are as follows:

Of course, it’s important to talk to your insulation company about specifics. They’ll be able to determine how much insulation you need and recommend solutions for your unique situation and any special cases.

Related to R-value and how much insulation you need, professionals will help you determine where you need to insulate (attic, walls or crawl space) and what type of insulation to install. Your options are:

  • Fiberglass
  • Radiant barrier
  • Spray foam
  • Cellulose

This is a lot of information, but don’t worry—you won’t be on your own. An insulation company will be able to help you with all your needs and explain R-value, the right amount of insulation for your home and more!

Home Insulation Services in DC & Maryland

The R-Value shouldn’t be the only determining factor. How old your home is, its location and building materials also play an important role when it comes to choosing the right insulation. Cost and the inhabitants of the home may be another factor in your decision-making. To discuss your project and get the ball rolling, get in touch with the Accurate Insulation team for your free estimate!

Contact us online or call 301-358-6411!

Products We Install
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Fiberglass

Our insulation team adds energy efficiency, comfort & value to homes & buildings.

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Spray Foam

Accurate Insulation is proud to be a leading installer of spray foam insulation.

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Cellulose

Environmentally friendly and effective, cellulose works well in homes and buildings.

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Radiant Barrier

We can help keep your home cooler and more comfortable with an attic radiant barrier.

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Garage Doors

When you turn to Accurate Insulation for garage doors, you work with a great team.

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Gutters

No matter your gutter needs, the Accurate Insulation team has you covered.

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