It depends on what insulation you use. Today, neither fiberglass nor cellulose insulation is made with toxic materials, but that wasn’t always the case.
In the past, fiberglass used to be made with toxic chemicals, such as formaldehyde. While these chemicals are no longer used, fiberglass itself is harmful to your lungs when inhaled and can irritate the skin.
Cellulose, on the other hand, consists of paper fibers treated with boric acid — a safe chemical that can be found in the ingredients of many beauty and hygiene products.
It depends on rebate programs that are offered locally by our city or county. These rebate programs often have highly specific parameters for what type of insulation work qualifies, so make sure you check with the appropriate officials.
No. If your home insulation has gotten wet, whether it is fiberglass or cellulose, it usually means it is time to remove and replace it. If fiberglass has had minimal water exposure, in some instances it can be salvaged.
Unfortunately, cellulose can not withstand any kind of heavy moisture (anything higher than humid air) and will need to be replaced if it gets wet.
If left undisturbed, properly installed home insulation can last between 40 and 50 years.
Cellulose is more efficient, more environmentally friendly, and less prone to animal infestations than fiberglass. For a full comparison complete with a pros and cons list, visit our page on different types of home insulation.
We recommend removing insulation if it has ever had an animal infestation, if it gets wet, or if you simply want to start fresh with an all-new product. If your attic’s old insulation is not damaged, you can keep it in place and add more new insulation to it.
Not removing the old insulation won’t affect performance in any negative way.