Insulation isn’t something you replace every year—but it also doesn’t last forever. Just like a roof or a water heater, insulation has a lifespan. And once it starts breaking down, it can quietly impact your comfort, energy costs, and even the structure of your home.
So how often should you replace it? It depends on the type, the installation quality, and your home’s specific conditions. Here’s how to tell when it’s time—and why it matters.
The Lifespan of Common Insulation Types
At ELM Insulation & Sound Solutions, we’ve seen every scenario, from 1970s fiberglass batts to compacted cellulose from the early 2000s. Here’s what we recommend watching for:
1. Fiberglass Insulation: 15–30 Years
Fiberglass is durable, but it can settle, absorb moisture, or become less effective over time. If your insulation is over 20 years old—or was exposed to pests or leaks—it’s probably time to replace it. Our attic insulation upgrades often address these exact issues.
2. Cellulose Insulation: 20–30 Years
Cellulose is eco-friendly and effective—but it’s vulnerable to moisture and can compress. If your home has musty smells or uneven temperatures, cellulose might be the hidden culprit. A professional inspection can tell you if it’s still doing its job.
3. Spray Foam Insulation: Up to 80 Years
Spray foam has the longest lifespan when installed correctly. But not all installations are perfect. Cracking, shrinking, or moisture intrusion can reduce its effectiveness. Even closed-cell foam should be checked after 15–20 years in harsh conditions.
Key Signs It’s Time to Replace Insulation
While lifespan gives you a general timeline, it’s often the symptoms that show up first. These are your biggest red flags:
- Temperature swings or cold/hot spots in different rooms
- Unusually high energy bills, especially during extreme weather
- Drafts or air leaks, especially near floors or ceilings
- Musty smells, mold growth, or signs of water damage
- Increased noise from outside or between rooms
If you’re noticing any of the above, your insulation may no longer be doing its job. We can help you assess what’s working—and what’s not.
Why Replacing Insulation Pays Off
Think of insulation as a long-term investment. New insulation helps reduce your monthly utility bills, improves indoor air quality, and creates a more stable, comfortable living environment.
It’s also essential for protecting against moisture damage. In places like attics and crawl spaces, bad insulation can lead to mold, wood rot, or pest infestations. That’s why we offer complete insulation and moisture barrier solutions to address both performance and prevention.
Our Assessment Process Is Easy
Not sure how old your insulation is? Most homeowners aren’t—and that’s totally normal. Our team uses thermal cameras, moisture meters, and visual inspections to evaluate what’s inside your walls and attic without tearing anything apart.
We’ll give you a clear picture of your current insulation performance and layout your options—whether it’s a simple top-up or a full upgrade. Schedule a free consultation here.
Your Home Deserves Better
Whether you’ve been in your home for decades or just moved in, it’s worth finding out what’s behind the drywall. Upgraded insulation can completely change the feel and function of your home—and it usually pays for itself faster than people expect.
We’ve helped clients from Santa Monica to San Diego stay warm in winter, cool in summer, and comfortable all year long. See if we serve your area.
Let’s make your home better, together.
