If you’re like most homeowners, you probably don’t question how long does insulation last—until your energy bills start creeping up or your home just doesn’t feel as comfortable as it used to. The truth is, insulation doesn’t last forever. While some types can perform well for decades, others wear down faster, especially in our New Jersey and New York climate where humidity, seasonal temperature swings, and critters can take their toll.
So, how long does insulation last? And more importantly—how do you know when it’s time to replace it? Let’s break it down.
How Long Does Different Insulation Last?
Fiberglass batts: Around 20–30 years, but moisture or pest damage can shorten that lifespan.
Blown-in cellulose: 20–30 years on average, though settling can reduce effectiveness in as little as 10–15 years.
Spray foam insulation: Can last 80+ years if installed properly, but poor installation or water damage can cause issues sooner.
Even the most durable insulation can lose performance if conditions change—think roof leaks, high humidity, or air gaps from settling.
Signs Your Insulation Needs Replacing
You don’t need to rip open your walls to know something’s wrong. Look for these telltale signs:
Rising energy bills even though your usage hasn’t changed.
Uneven temperatures—rooms that are too hot in summer or too cold in winter.
Drafts or cold floors, especially near exterior walls.
Pest activity—rodents and insects love nesting in old insulation.
Musty smells or visible mold, which means moisture has gotten in.
If you’re noticing one or more of these issues, it’s time to call in a pro for an inspection.
Why Timely Replacement Matters
Ignoring old or damaged insulation can cost you more than just comfort—it can mean:
Higher heating and cooling costs year-round.
Increased strain on your HVAC system.
Poor indoor air quality from mold or allergens.
Reduced home value if energy efficiency tests poorly.
By replacing insulation on time, you restore efficiency, comfort, and indoor air health.
How Metro NY Insulation Can Help
At Metro NY Insulation, we’ve been helping homeowners in Bergen, Essex, Passaic, Hudson Counties (NJ) and Sullivan, Dutchess, Ulster, Orange, Westchester, Rockland Counties (NY) since 2005. We offer free home energy audits, expert insulation removal & replacement, and guidance on rebates and incentives so you can save on your upgrade.
We’ll check for signs of damage, measure current R-values, and recommend the best solution—whether that’s fresh blown-in cellulose, spray foam, or another option that fits your home and budget.
Contact Our Insulation Experts
Work With Our Top Rated Insulation Service Team
Bottom line: Insulation isn’t a “set it and forget it” part of your home. With regular checks and timely replacement, you can enjoy lower bills, year-round comfort, and peace of mind for decades.
Ready to see if it’s time for new insulation? Call the top rated team at Metro NY Insulation today to schedule your home energy audit and take the first step toward a more efficient home.