If your home was built before 2000, your attic insulation is almost certainly below current standards. Here's what you need to know — and what a top-up actually costs.
Attic insulation is one of those home upgrades that most people don't think about until they're dealing with a problem — high energy bills, ice dams every winter, or an attic mold discovery. The good news: it's one of the simplest and best-value investments a GTA homeowner can make.
A properly insulated attic keeps heat in during our brutal winters, keeps heat out during summer, prevents moisture problems, and can reduce your heating and cooling bills by 15–20%.
R-value measures a material's resistance to heat transfer. Higher R-value = better insulation. Simple as that.
Ontario's Building Code sets the minimum attic insulation requirement at R-60 for new construction — approximately 17 inches of blown cellulose. Here's where most GTA homes actually stand:
If your home is more than 20 years old and hasn't had an insulation top-up, there's a very good chance you're significantly below current standards — and paying for it in energy costs every month.
Made from recycled paper. Excellent coverage — fills every gap and corner. Eco-friendly. Best performance-to-cost ratio for attic top-ups. Our go-to product.
Pre-cut batts installed between joists. Easier for DIY but leaves gaps at edges and obstructions. Less effective over time as it settles.
Highest cost, excellent air sealing. Best for specific applications (cathedral ceilings, knee walls). Overkill for most standard attic top-ups.
This is where a lot of DIY jobs go wrong. Simply blowing more insulation over what's there can trap moisture, block ventilation, and reduce effectiveness. Here's what a proper top-up looks like:
Before any work starts, we measure what's already there. This determines the target depth and the amount of material required.
This is the most commonly skipped step — and the most important. Air bypasses are the spots where warm air leaks from the living space into the attic: recessed pot lights, attic hatches, bathroom exhaust fans, plumbing penetrations. Sealing these properly before adding insulation depth delivers more benefit than simply adding more material.
Baffles are installed at the eaves to ensure soffit vents remain unblocked after the new insulation is added. Blocking soffit vents is a very common mistake — it kills airflow and causes the exact moisture problems you're trying to prevent.
Cellulose is blown in to achieve an even depth across the entire attic floor. A typical 1,200 sq ft attic job takes about a day to complete.
Attic insulation upgrades may qualify for rebates under federal and provincial programs. The Canada Greener Homes Grant and Enbridge Home Efficiency Rebate Plus (HER+) program have both offered rebates for insulation upgrades in Ontario. Programs change — ask us about current availability when you call, or check Natural Resources Canada's website for up-to-date details. A pre- and post-assessment is typically required to qualify.
An attic insulation top-up for a typical GTA bungalow (1,000–1,500 sq ft attic) generally ranges from $2,500 to $4,500 depending on current insulation levels, attic accessibility, and the amount of air sealing required.
When you factor in energy savings, most homeowners see a payback period of 3 to 6 years — and the insulation lasts for the life of the home with virtually no maintenance.
We'll check your attic as part of any roofing inspection — at no charge. If you need a top-up, we'll tell you exactly what's needed and give you a clear quote. No pressure.
Book a Free Assessment 416-889-0629