Attic Insulation in Ontario- Why It Matters and How Advanced Basement Systems Does it Right

At Advanced Basement Systems, we’ve seen first-hand how much your attic impacts your comfort, energy bills, and even your home’s health. Across Ontario, countless homes are under-insulated or missing proper air sealing, which means heat is escaping in the winter and unwanted heat is pouring in during the summer. If you’re searching for attic insulation in Ontario, here’s why the right approach- especially with removing old existing insulation and applying a continuous spray foam vapour barrier- makes all the difference.

Why Proper Attic Insulation is So Important in Ontario Homes

In our cold winters and hot, humid summers, your attic is a critical battleground for energy efficiency:

• In the winter – Warm air naturally rises and will leak into your attic if there’s not enough insulation or proper air sealing. This stack effect drives up heating bills and makes upstairs rooms drafty.

• In the summer – Ontario attics can easily hit 60°C (140°F) or higher. Without the right insulation and sealing, that heat radiates down into your living space, forcing your air conditioner to work overtime.

• Year-round – Poor attic performance means higher energy costs, uncomfortable rooms, and more wear and tear on your HVAC system.

That’s why our team always focuses on more than just R-value... we make sure your attic is sealed, insulated, and protected from moisture.

The Hidden Danger: Air Leaks and Moisture

One of the most common problems we find during attic inspections is air leakage from the living space below. Warm, moist air travels upward through cracks, gaps, and unsealed penetrations, eventually condensing on cold surfaces in the attic.

This is a major cause of:

• Attic mold growth – Often found on roof sheathing and framing.

• Wood rot – Which can damage structural components over time.

• Insulation deterioration – Moisture reduces effectiveness and can lead to odours.

• Wrong Insulation - Fiberglass or vermiculite is not what you want in your attic.

The solution? Remove the existing insulation and seal those leaks and create a proper vapour barrier before insulating.

Spray Foam Vapour Barrier- The Gold Standard

At Advanced Basement Systems, we specialize in spray foam insulation because it does three jobs in one: it insulates, air seals, and acts as a vapour and air barrier. This is especially critical for Ontario homes that:

1. Don’t Have a Poly Vapour Barrier

Older homes often lack the classic polyethylene vapour barrier. Without it, moisture moves freely into the attic, risking mold, rot, and energy loss. Spray foam completely seals the surface- creating a continuous vapour barrier that stops air and moisture in their tracks.

2. Do Have a Poly Barrier But Still Need Air Sealing

Even when a poly barrier exists, it’s often pieced together with overlaps, gaps, and punctures. This lets air and moisture bypass the barrier. Our spray foam adheres directly to joists, drywall, and other surfaces, creating a monolithic seal! The result? Better efficiency, better protection, and peace of mind that your vapour barrier is truly unbroken. Once the old insulation is removed, our team can apply the spray foam. 

Why Ontario Homeowners Choose Advanced Basement Systems for Attic Insulation

• Local expertise - We understand Ontario’s climate and building styles. We live here too!

• Proven process - From inspection to final cellulose install, we ensure your attic is sealed and insulated correctly the first time.

• Mould prevention - Our approach stops moisture before it starts, protecting your home’s health.

• Long-term savings - A properly insulated attic can cut heating and cooling costs by up to 40%.
• High Powered Equipment - We use efficient and effective machines to remove old insulation and blow new cellulose.

Ready to Upgrade Your Attic?

If you’ve been searching for attic insulation in Windsor, Chatham, Sarnia, London or nearby, the experts at Advanced Basement Systems can help you enjoy lower energy bills, a more comfortable home, and lasting protection against moisture and mold. Whether you need insulation removal and a spray foam vapour barrier, cellulose top-up, or a full attic overhaul, we have the experience and patented solutions to do it right.

Call us today or request your FREE attic insulation quote and see how we can transform your attic into a clean, efficient, and healthy part of your home.