A common time to add more residential insulation to a home is during a remodeling project. This is because concealed parts of the house become exposed throughout the process, making it easier to install the material. Use this guide to find out whether you can add new insulation over the existing one, or if it needs to be replaced entirely.

Can New Insulation Be Installed Over the Old Layer?

In most instances, homeowners can install the new residential insulation over the existing layer, but there are some exceptions to this rule. For example, it’s best to remove the old material if you’ll apply spray foam insulation because you’ll help ensure the foam fills as much space as possible.

The old layer should also be removed if it shows any signs of deterioration, like water damage or mold growth. Additionally, the old layer needs to be removed and replaced if your remodeling contractor found traces of asbestos in it. This mineral can cause severe health concerns, like lung cancer and mesothelioma.

How to Choose New Residential Insulation

The first step is choosing the correct R-value for the insulation. This measurement determines how effectively the material resists the conductive flow of heat. Homes in Alaska should use a material with an R-value of at least 15 for walls, R-50 for the attic, and R-25 for the floors and crawl spaces.

Never use faced insulation when adding material over an existing layer, as it has a vapor barrier that traps moisture and encourages mildew and mold growth. Instead, opt for unfaced batt or rolled insulation since it won’t compress the old material and affect its efficiency.

The new layer needs to be secured with care because flattened insulation is less effective. If you want a professional to handle this critical task, turn to Alas-Co General Construction in Anchorage, AK. These technicians have provided homeowners with fitted and accurate installations for over 30 years. They offer a wide variety of residential insulation and can install it anywhere in the house. Get more information about their services online, or call (907) 522-2297 to request a free estimate.