Removing old insulation is generally recommended if it's damaged, contaminated with mold, or infested with pests. However, if the insulation is in decent shape and just needs a boost, adding a new layer on top can be a cost-effective option.
Removing the old insulation would be more beneficial than leaving it. The older insulation is no longer effective because it has compressed over time. You'll also be able to get a more consistent r-value from the newer insulation because the older insulation is likely variable in height.
Generally it is better to lay the new insulation over the top of the old stuff. The only reason to lift the old insulation is if it is rotten, damp, or harboring vermin.
Unless the old insulation is in bad shape (eg mold), there's no need to throw it away. Reuse the old and add some new insulation at the same time. You'll end up requiring much less new insulation.
The average attic insulation removal cost is $900, but often ranges between $600 and $1,200, depending on attic size and whether your pro has to work with hazardous materials.
Conclusion. Attic insulation can last 80 to 100 years, though it loses its energy efficiency benefits with time. Certified attic specialists' professional advice is to upgrade it every 15 years to ensure that it is still performing the job.
Any reputable insulation installer will thoroughly remove old insulation before putting in the new. However, as a homeowner, you should double-check that they remove all of the old insulation as a first step.
Generally speaking, replacing old insulation may not be worth it if old insulation is dry, free of dust and it is not squashed. In this case, its removal isn't necessary. In fact, it can be quite beneficial to leave old insulation.
Attic insulation costs anywhere from $1,680 to $3,125, depending on the size of your attic and the material used. On average, most homeowners shell out around $2,380. These costs include the insulation materials and installation by a professional.
The only definitive way to know whether the insulation is safe is to have it professionally tested. If your house was built before 1980, you should assume it contains asbestos until testing proves otherwise.
Types of Insulation
Insulation that can be removed by hand – Batt and roll insulation—also known as insulation blankets—are strips of insulated material that are shaped to fit between the slats and boards of your home. This is the only type of insulation that can be removed by hand, due to its rigid structure.
Yes, it is possible to put too much insulation in a loft or attic.
SAVINGS AND COMFORT
EPA estimates that homeowners can save an average of 15% on heating and cooling costs (or an average of 11% on total energy costs) by air sealing their homes and adding insulation in attics, floors over crawl spaces and basements.
Remove Old Attic Insulation for Better Heating and Cooling
The primary reason for removing old attic insulation is to ensure that your home is heated and cooled properly. With age, attic insulation typically deteriorates, meaning that it loses its ability to effectively regulate temperatures and insulate your home.
In many cases you can add new insulation on top of old insulation, unless the old insulation is wet, mouldy, or vermiculite. If the old insulation is dry but appears to have previously been wet, you should look for the cause and repair the problem.
Unfortunately, the majority of homes built 50 years ago were not insulated at all. It is important to be aware of these insulation issues if your home is 50+ years old. Replacement (or new installation) may be necessary if your home is drafty, if you have high utility bills, etc.
An attic insulation upgrade may be in order if your energy bills are out of control and your home has wildly inconsistent temperatures. The comfort and energy efficiency of your home can often be enhanced by retrofitting rather than removing the current insulation.
The preferred method of removing blown in insulation is by machine, using a vacuum process to suck the insulation out of the attic. This is the most efficient option and can save both time and money. If you're doing the removal yourself, you'll need to rent a high-powered insulation vacuum.
attic with a mixture of fiberglass batts and blown-in cellulose. This project's low cost is $500 to add fiberglass batts to a partially insulated attic. The high cost is $10,000 to install spray foam insulation on all areas of a 1,500 sq. ft.
If the attic damage was caused by a covered risk, such as fire or wind, your home's insurance policy may pay the cost of rehabilitation. Repairing or replacing damaged insulation, drywall, and other materials could be included.