Homeowners often hear that adding more attic insulation—known as an insulation top-up—is a simple and effective way to improve energy efficiency. And that’s true. A well-insulated attic helps maintain comfortable temperatures year-round, reduces heat loss, and can even lower energy bills.
But there’s one common misconception worth clearing up:
If your home is experiencing ice damming, adding more insulation will not solve the problem.
In this article, we explain why top-ups are beneficial, the real cause of ice dams, and the steps homeowners should take to protect their homes.
What Is an Attic Insulation Top-Up?
An attic insulation top-up involves adding new insulation over the existing material to reach the recommended R-value for your region. This is especially effective in older homes, where insulation levels may be far below today’s standards.
Benefits of a top-up include:
- Better temperature control
- Lower heating and cooling costs
- Improved comfort in both winter and summer
- Reduced strain on your HVAC system
Top-ups are an excellent upgrade when the attic is functioning correctly.
Why Ice Damming Happens (And Why a Top-Up Won’t Fix It)
Ice damming occurs when heat escapes from the living space into the attic through gaps, cracks, and unsealed penetrations. This warm air melts the snow on your roof. As that meltwater runs down toward the colder eaves, it refreezes, forming an ice ridge.
Ice buildup traps water on your roof, which can leak into the home and cause significant damage.
Here’s the key point:
Ice damming is a sign of air leakage, not just low insulation levels.
Even if you add more insulation on top, warm air can still escape through unsealed areas. The insulation is buried under warm airflow patterns that continue to melt snow from below. So, while insulation helps retain heat, it cannot stop attic air leaks on its own.
The Real Solution: Air Sealing First, Insulation Second
To properly eliminate ice damming – and prevent it from returning – you must address the root cause:
Seal the air leaks in your attic.
Air sealing involves closing off all the hidden pathways where warm indoor air escapes, such as:
- Gaps around electrical wiring and fixtures
- Plumbing penetrations
- Chimney or vent chases
- Attic hatches and access points
- Cracks in framing or drywall
Once these areas are sealed, the attic can finally maintain a stable, cold temperature in winter—precisely what you want to prevent ice damming.
Only after air sealing is complete should you move forward with your insulation top-up. At that point, the insulation will perform efficiently and deliver the results you expect.
How Polar Bear Spray Foam Inc Can Help
At Polar Bear Spray Foam Inc., we specialize in diagnosing attic issues and providing long-term solutions. Whether you need air sealing, insulation, or a full attic upgrade, our team ensures the job is done correctly from the start.
✔ Professional attic inspections
✔ Expert air sealing solutions
✔ High-quality spray foam and blown-in insulation
✔ Honest guidance—no unnecessary upsells
If you’re experiencing ice damming or considering an attic top-up, we’ll help you choose the right approach for your home.
📞 Call Polar Bear Spray Foam Inc today: 705-207-5256
📩 Message us to schedule an inspection or ask questions!
