• 15121 Marlboro Pike, Upper Marlboro, MD 20772
    260 East Boulevard North Hagerstown, MD 21740
  • |Contact Us
Call Your Local Pros Today! 301-358-6411

Can You Add New Insulation Over Old or Damaged Insulation?

Technician kneeling and installing yellow batt insulation in an attic, while wearing a face mask.

Installing new insulation is a great way to help reduce your energy bills and your carbon footprint. Many people have insulation in their attic, basement or walls, but extra insulation can help better insulate their homes.

Is it possible to add new insulation over old materials? We’ll discuss the option of keeping your current insulation while adding additional materials, and situations where adding new insulation without removing the old is a bad idea.

Keep your home insulated with the best materials available. Contact Accurate Insulation at 301-358-6411 to schedule services today.

When Can You Keep Old Insulation?

Installing new insulation over old is a viable option for keeping your home warm in the winter and cool in the summer. However, it requires that the current insulation is in good condition.

It’s vital that a professional insulation technician inspect your current insulation before adding another layer. They can tell for sure if your current insulation is in good shape and if a new layer would be beneficial.

Get a Free Insulation Estimate from Accurate Insulation in Maryland!

Signs You Should Remove Old Insulation

If you have old insulation and want to add fresh material on top of it, it’s important that the underlying insulation not be wet, damp or previously made wet.

Water from rain or a busted pipe can soak into the insulation and create a breeding ground for mold, mildew and insects. If your home insulation has become wet or moldy, this insulation should be removed and replaced as soon as possible.

It’s also important to find the root cause of the dampness and resolve the issue. If a pipe bursts or leaks, make sure to have a plumber fix it. If rain came into the home and dampened the insulation, a roofer may be needed.

Call Accurate Insulation for a home insulation inspection. Our experienced contractors will inspect your existing insulation and give you a quote for new home retrofit insulation.

Technicians standing on home's porch, installing retrofit insulation through the front stone facade.

Insulation Removal & Replacement Process for Homes

Adding new insulation depends on a variety of factors. If your old insulation is damp or water-damaged, it needs to be removed and replaced. If the current insulation has always been dry, you can add fresh insulation on top of it.

What to know about installing new insulation:

  • Insulation should be rolled out perpendicular to roof joists.
  • Rolled insulation should never be tacked down or else it can lose much of its R-value, or its ability to insulate.
  • If you have vermiculite insulation, it should be tested before being removed. If tests show that it contains harmful chemicals, a certified professional must carefully remove it.
  • Performing air sealing is a good idea before installing new insulation, as it can significantly raise the energy efficiency of the insulation.

Adding new insulation is a big task that should only be handled by trained professionals.

When you need new insulation for your DC-area home, contact Accurate Insulation by calling 301-358-6411.

Contact Your Local Maryland & DC Insulation Contractors for Insulation Services

The team at Accurate Insulation can install fresh insulation in your DC-area home. We install fiberglass, cellulose, spray foam and radiant barrier insulation. Whether you need extra insulation on top of your current materials or need to replace old insulation, we can help.

Get a Free Insulation Estimate from Accurate Insulation in Maryland!


How do I know when I need more insulation in my attic?

You may need attic insulation if you feel a draft coming from the attic or if your heating bill is higher than it used to be.

What’s the best material to use when adding more insulation to an attic?

The best insulating materials will depend on a few factors. Typically, it’s best to use the same materials you already have, but our team can discuss your options and make a proper recommendation. Accurate Insulation installs fiberglass, cellulose and spray foam insulation.

Can you put faced insulation over existing insulation?

It’s not recommended to place faced insulation on top of existing insulation in an attic. New insulation needs to be put in place with a vapor guard.

Products We Install

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

Spray Foam

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


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

Radiant Barrier

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

Garage Doors

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


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


Accurate Insulation is proud to be a leading supplier of quality window blinds.

Are You Sure?
Stay on Page
You are about to leave this Accurate Insulation - Upper Marlboro and enter a third-party site. Accurate Insulation - Upper Marlboro and Installed Building Products have no control over, and accept no liability, obligation, or responsibility for, the contents or performance of other websites. Any such link does not constitute an endorsement or any representation regarding, the linked website, its content, its owner, its performance, its owner’s products or services, or any forward-looking statements found in.
Leave Page
Stay on Page