The longevity of attic insulation varies depending on the material used. Blown insulation can be made of polystyrene, fiberglass, and wool, and each has a different lifespan. Fiberglass blocks typically last for around 20 years, while other types can last up to 80 to 100 years. Fiberglass insulation is a popular choice due to its construction with natural materials.
However, it needs to be replaced every 15 to 20 years as it can become dirty, wet, moldy, and ineffective if a roof leaks or is damaged by water. Additionally, recycled materials have a lifespan of 20 to 30 years. Cellulose insulation is also susceptible to external elements that can degrade it faster. Generally, attic insulation has an expected lifespan of 80 to 100 years.
However, some professionals suggest replacing it every 15 years as it may become less effective with age. For example, fiberglass can become dirty, wet, or covered with mold over time. It is important to consult a professional attic insulation contractor for an inspection of the insulation. Do not attempt to install it yourself as you may cause harm or install it incorrectly. Additionally, make sure your attic is dry and insulated to protect your family from rodents, mold contamination, dust, dirt, and other contaminants. When considering the typical life periods of attic insulation, take into account the year in which the house was installed rather than the year you moved in.
In the past, homeowners used whatever materials they had on hand such as newspapers, bottles, cans and old clothes against walls and ceilings in an attempt to block out the cold. The average lifespan of mineral wool insulation is similar to that of fiberglass at 80 years while cellulose does not reach 20 years. The R-value needed for your home depends on where you live and where you install the insulation. Attic insulation also helps prevent foreign odors, rodent infestations, and other unwanted problems that can occur inside an attic. In South Florida's hot and humid climate, moisture can accumulate quickly through the attic.
It is important to be aware of this when evaluating the age of your insulation and determining what type of insulation you have. If you are unsure whether or not asbestos needs to be removed from your attic insulation, contact an inspector for assistance.
