You usually do not need to remove old blown-in insulation before adding new insulation. In most cases, it is more cost-effective to leave the old layer in place and simply blow a new layer on top to boost your home’s energy efficiency.
Buyers often walk away from homes with spray foam insulation because it can cause major mortgage and insurance denials. The foam tightly seals roof spaces, trapping moisture, and covers up structural timbers. This makes it impossible for surveyors to inspect for hidden rot or damage, which can lead to catastrophic repair costs.
Professional removal of blown-in insulation typically costs between $1 and $3 per square foot, which equates to $800 to $3,000 for a standard attic, depending on size, accessibility, and contamination. Many contractors also enforce a minimum project fee of $1,000 to $1,500.
Loose-Fill Insulation
The type of insulation most commonly made with asbestos is loose-fill, also called blown-in insulation. Loose-fill insulation comes in a variety of materials and is easy to identify by its loose, lumpy form and fluffy or granular texture.
Fiberglass insulation does not stay in the lungs permanently. Unlike asbestos, which the body cannot break down, fiberglass particles are generally cleared out by the lungs' natural defenses (macrophages) within about 10 days to a few weeks.
Short-term Exposure
The symptoms of irritation are often nonspecific, temporary, and may include itching, coughing, or wheezing. High levels of exposure to airborne fiberglass may aggravate existing asthma or bronchitis-like conditions.
No, fiberglass insulation should never be left uncovered. Why? Health Hazards: Exposed fiberglass can release fine particles and fibers into the air, which can cause respiratory irritation, skin rashes, and eye irritation. Long-term exposure can lead to more serious health problems.
You do not always need to remove old blown-in insulation before adding new insulation, as placing new material on top is often the most cost-effective way to boost energy efficiency. However, removal is mandatory if the insulation has sustained water damage, mold, pest contamination, or contains hazardous materials like asbestos or vermiculite.
Your lungs can clear out some inhaled asbestos fibers naturally through coughing and mucus, but many fibers become permanently lodged in deep lung tissue. The body cannot break down these trapped fibers, which leads to long-term inflammation, scarring, and severe health risks like mesothelioma or asbestosis.
The "pink fluffy stuff" in your attic is fiberglass insulation. It is made by melting a mixture of sand and recycled glass, then spinning it into tiny, lightweight fibers. The pink color is simply a trademark created by the major manufacturer Owens Corning in the 1950s as a marketing strategy.
Insulating a 1,600 sq ft house typically costs between $1,600 and $7,200 for professional installation. Costs average about $1.00 to $4.50 per square foot, heavily dependent on the material chosen, the difficulty of accessing the space (e.g., attics vs. enclosed walls), and whether you need to pay for old insulation removal.
Most homeowner's insurance policies generally do not cover the expenses of regular maintenance or voluntary attic restoration for non-insurable reasons, such as adding living space or increasing the home's value. Your homeowner's insurance policy may provide specific coverage limits for certain types of damage.
If you're ready to sell your home, it may be the right time for a blown-in insulation upgrade. It may seem counterintuitive to make significant investments before moving. However, this step increases the home's comfort and drives up the resale value.
Yes, rodents absolutely love foam board insulation. While it offers no nutritional value, the soft texture is incredibly easy for mice and rats to chew through. They shred it to build warm, insulated nests, and use the boards to create extensive, hidden tunnel systems within your walls.
The healthiest insulations for a house are natural, bio-based materials that offer excellent thermal performance without off-gassing toxic chemicals. The safest and most non-toxic options available are sheep's wool, hemp, cotton (denim), and cork.
Banks and mortgage lenders often dislike or outright reject homes with spray foam insulation because it can trap moisture against roof timbers, leading to hidden wood rot, mold, and structural decay. Additionally, the foam conceals the roof structure during valuations, making it impossible for surveyors to assess the roof's true condition.
Yes, mice strongly dislike cellulose insulation, though it is not a 100% foolproof deterrent.
Yes, your lungs are highly effective at clearing out most inhaled fiberglass. The body removes larger fibers through coughing and sneezing, while specialized immune cells engulf and break down smaller particles. However, prolonged or extremely heavy exposure can cause temporary irritation and long-term risks.
That "cotton candy" in your attic isn't a sugary treat—it is fiberglass or mineral wool insulation. It is placed in your attic to keep your house energy efficient by trapping air, regulating indoor temperatures, and lowering your heating and cooling costs.
The most famous actor to die of mesothelioma was Hollywood icon Steve McQueen. The "King of Cool" passed away from pleural mesothelioma on November 7, 1980, at the age of 50, following asbestos exposure during his military service and early film career.
Inhaling a small amount of asbestos rarely causes immediate symptoms, as your body naturally clears most of these fibers. However, there is no completely safe level of exposure. Trapped fibers can permanently lodge in lung tissue, increasing the long-term risk of severe, delayed illnesses.
Symptoms of mesothelioma vary based on the cancer's location (lungs, abdomen, or heart), but generally include:
Blown-in insulation is not inherently toxic, but it can be highly irritating and potentially hazardous if inhaled or touched. Both fiberglass and cellulose materials release airborne particulates that cause temporary eye, nose, throat, and skin irritation. It can also severely trigger preexisting conditions like asthma.
To disinfect an attic after removing old insulation, first HEPA-vacuum all droppings and debris. Next, spray down the wood framing, flooring, and air vents with an EPA-registered antimicrobial disinfectant or a bleach-water solution (1 part bleach to 9 parts water), and finish with an enzymatic neutralizer to eliminate lingering odors.
Wear safety glasses with side shields, gloves and dust masks. Wear old or disposable clothing. Ensure you wear long pants, shirts with long sleeves and boots. Covering yourself as much as possible will reduce skin contact and potential irritation.