How Long Does Blown-In Insulation Last?

Blown-in insulation refers to loose particles of insulating material—usually cellulose or fiberglass—that are blown into attic spaces, wall cavities, and other hard-to-reach areas. It’s one of the most effective ways to insulate existing structures or supplement underperforming insulation. This method creates a seamless blanket of coverage that helps regulate indoor temperature year-round, especially during the intense Texas summers.

Typical Lifespan of Blown-In Insulation

Blown-in insulation can last anywhere from 20 to 30 years, depending on the material used and the conditions of the home. Fiberglass blown-in insulation generally maintains its performance for decades with little to no settling, while cellulose insulation may settle slightly over time but still performs effectively for 20–25 years. The lifespan is also influenced by factors such as moisture levels, ventilation, pest control, and whether the insulation was properly installed.

Signs That It’s Time to Replace Blown-In Insulation

Even though blown-in insulation is long-lasting, it doesn’t last forever. Signs that your insulation may be deteriorating include rising energy bills, temperature inconsistencies from room to room, drafts in the home, and visible settling in your attic insulation. You may also notice increased allergy symptoms if your old insulation is harboring dust, pests, or mold due to age or moisture damage. If your insulation is more than 20 years old, it’s wise to have it inspected to determine its current effectiveness.

Can Blown-In Insulation Be Topped Off?

Yes. One of the biggest advantages of blown-in insulation is that it can be added to without removing what’s already there. If your insulation has settled over time or wasn’t initially installed at the recommended depth, we can easily apply a fresh layer to restore proper coverage. Topping off insulation is a cost-effective way to boost efficiency without the need for a full replacement. At Allstar Insulation, we use thermal imaging and R-value calculations to determine exactly what your home needs.

How to Make It Last Longer

To get the most from your blown-in insulation, make sure your attic and wall cavities are well ventilated and moisture-free. Moisture is the most common cause of premature insulation degradation, especially in cellulose. Regular roof inspections, sealing air leaks, and maintaining your HVAC system all play a role in prolonging insulation lifespan. We also recommend having your insulation evaluated every 10 years to ensure it’s still performing at its best.

Why Choose Allstar Insulation in Waco

With decades of experience and a commitment to customer satisfaction, Allstar Insulation is the go-to choice for blown-in insulation in Central Texas. We know what local homes need to stay cool in the summer and warm in the winter. Our expert technicians provide honest assessments and high-quality installations using top-tier materials that are made to last. Whether you need a full replacement or just a top-off, we’ll make sure your insulation works as hard as you do.

Conclusion

Blown-in insulation is a reliable, efficient, and long-lasting way to keep your home comfortable and energy efficient—but it still needs maintenance and occasional updates to perform at its best. Trust Allstar Insulation to help you evaluate your current insulation and provide expert solutions that last. Contact us today to schedule your insulation assessment and take the first step toward lower bills and better comfort.