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How to Check the Insulation in Your Home

How to Check the Insulation in Your Home

October 3, 2019

How to Check the Insulation in Your Home

As the colder months approach, you probably have started wondering about the insulation in your home. You might have heard about the negative effects of having an under-insulated home from several experts. However, there is not much you can do if you don’t know how to check the insulation in your home. By knowing where and how to check for insulation, you can make an informed and independent decision about making any insulation-related changes. To help you out, the pros at DFW Thermal have a quick guide with some effective suggestions!


We might have mentioned this before, but we only do so because it is important. The first place you want to check for insulation is your attic. The attic is the highest place in your home, so if it is lacking in insulation or it has any cracks, air has the highest chance of escaping from here. Here are two ways you can check for insulation in the attic:

Visual Inspection

Make your way into the attic and do a visual scan. If you notice that the insulation level is below or lined up with the attic floor joists, that means you don’t have enough insulation. However, if you notice that the insulation is covering the joists, you should still measure the R-Value.

Measure the R-Value

The R-Value rates the ability of insulation products to resist thermal flow. So, if the R-Value is higher that means the insulation ability of the product is better. To measure the R-Value of your attic insulation, follow this easy step-by-step guide. Remember to wear gloves, a dust mask, and work clothes that cover exposed skin. If the R-Value fits the value required by the region you are in, you have enough insulation in your attic.

Exterior Walls

To check if your exterior walls have insulation, use an electrical outlet. It sounds a little odd but bear with us. Here’s how you do it:

  • Turn off the power to the outlet. Use a voltage tester to ensure there is no power in the outlet.
  • Unscrew the outlet cover and use a flashlight to look in the crack around the outlet box. You should be able to see the insulation inside the walls and inspect how thick it is.
  • You can reach in and pull out the insulation to determine the type.
  • Check the other walls in your home as well.

For your interior walls, you can try doing the touch test—this might not be as effective but there’s no harm in giving it a shot. In the colder months, the interior walls should be warm and dry. If the dry wall feels cold and damp, there might be an issue with the insulation.

Windows and Doors

There are several ways you can check for leaks around your doors and windows. Here are methods you can try out:

Light Test

Shine a flashlight at night over any gaps or cracks as a family member or friend examines while standing outside. If the light noticeably shines through the sealed edges of doors and windows, you might have an air leak.

Paper Test

You can also find leaks through doors and windows using this paper test. Shut a door or window on a piece of paper. If you can pull out the paper without tearing it, you might have a gap through which air is escaping.

Check Your Insulation with DFW Thermal

The best way to check for your home’s insulation, is to ask an insulation expert. Get in touch with one of the pros from DFW Thermal to learn about your home’s insulation needs. Call us today at 214-731-3115 or schedule an appointment online!