The lifespan of attic insulation typically ranges from 10 to 15 years, but this can be affected by a variety of factors such as weather, ventilation, and pests in your home. Extreme temperatures or high humidity can cause the insulation to break down more quickly. Fiberglass insulation has an estimated lifespan of 80 to 100 years, but as it ages it degrades and leaves gaps where air can escape. A visual inspection of the attic can tell you a lot about the condition of your insulation, as well as what type it is.
If you're not sure what is causing your moisture problems, it is best to have your attic inspected by a professional before installing new insulation. Replacing attic insulation can restore energy efficiency and comfort for homes with insufficient or damaged insulation. If you find a roof leak, it is best practice to have the attic insulation in that area professionally inspected. You may not know that if your roof is leaking, you'll likely need to change your attic insulation as well. Before insulating, you'll need to seal air leaks throughout the house (including the attic).
If you notice mold growing on attic insulation material or on surrounding surfaces, such as the structure surrounding the roof plane, it is important to consider removing and replacing the attic insulation. Attic insulation can capture and retain contaminants, even if you've worked hard to clean the rest of the attic. Attics can reach up to 150 degrees in summer, so if attic insulation is poor, those high temperatures will radiate directly into the rooms. From a home with drafts that are too high to energy bills that keep rising, there are several signs that indicate your attic insulation may need to be replaced. Rodents love attics because they're protected from the elements that heat and dry them, they're protected from predators, and they have lots of great materials for nesting in the form of insulation or stored belongings.
