Blown-In Fiberglass Insulation for Peterborough Homes — Done Right.
Peterborough winters are long and cold, and a thin attic lets your heat escape straight through the roof. Blown-in fiberglass is one of the fastest, most affordable ways to bring a Peterborough attic up to the R-60 standard. Pro Insulation Contracting installs Owens Corning and Johns Manville blown-in fiberglass throughout Peterborough — licensed, BBB-accredited, 4.9★ rated.
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Why blown-in fiberglass works for Peterborough homes
Peterborough sits in one of the colder pockets of southern Ontario — long winters, real snow load off Lake Simcoe, and heating seasons that stretch from November well into March. In those conditions, the attic is where homes leak the most heat. If your upstairs is freezing while the main floor is comfortable, or your gas bill climbs every January, a thin or settled attic is usually the cause.
Blown-in fiberglass is loose-fill insulation made from spun glass fibres — glass and sand processed into a light, fluffy material. It’s blown into your attic with a machine, so it fills around joists, wiring, and corners and settles into an even blanket. It’s lighter than cellulose, naturally fire- and water-resistant, and one of the most affordable ways to add real R-value. For a lot of Peterborough attics — especially straightforward top-ups — it’s the practical choice.
WHAT WE OFFER
Fiberglass Blown-In Insulation in Peterborough
Free On-Site Assessment
We will send an experienced insulation expert to your location and provide a detailed assessment.
Rebate Application Done-For-You
We first assess whether you are eligible for the rebate. Then we help you apply for it and provide updates for you until you receive it.
Quality Products & Excellent Craftsmanship
We only use branded products that are high-quality and long-lasting. Our team has been serving in the industry for more than 10 years!
How much insulation does a Peterborough attic need?
Ontario’s Building Code sets a minimum of R-60 for attic insulation in new construction, and it’s the level worth targeting in any Peterborough home. Because fiberglass has a slightly lower R-value per inch than cellulose, reaching R-60 with blown-in fiberglass takes roughly 20 to 24 inches of settled depth. We measure what’s already up there first — in most homes, new fiberglass goes right over the old layer and the R-values add together, so removal usually isn’t needed.
Plenty of older Peterborough homes were built to standards well below R-60, and newer south-end subdivisions were often built to the minimum and no more. Either way, the gap shows up on your heating bill.
When fiberglass is the right call — and when it isn't
Fiberglass is excellent for attic top-ups where the existing insulation is thin but clean, for budget-conscious projects that still need to hit R-60, and for large open attic floors where blown-in coverage is fast and even.
What it doesn’t do is air-seal. If your real problem is drafts, a cold room over the garage, or attic moisture, fiberglass alone is a partial fix — it insulates well but doesn’t stop air movement the way spray foam does. We’ll tell you that at the inspection rather than overselling a top-up that won’t solve the actual issue.
Blown-in fiberglass for a Peterborough attic — the honest pros and cons
Pros
- Cost-effective — usually the most budget-friendly route to R-60.
- Fast, even coverage — fills the gaps batts leave open around joists and wiring.
- Lighter than cellulose — less load on the ceiling structure.
- Fire- and moisture-resistant — handles Peterborough’s freeze-thaw cycles (existing leaks must be fixed first).
- Adds over existing insulation — usually no removal needed; R-values stack.
- Rebate-eligible — accepted under current Ontario energy rebate programs.
Cons
- Lower R-value per inch than cellulose — needs ~20–24″ of depth to reach R-60.
- Doesn’t air-seal on its own — for drafts and air-leakage problems, it needs to be paired with air sealing or another product.
- Lighter material can shift in attics with heavy air movement if baffles and sealing aren’t done first — which is why prep matters in a windy, cold climate like Peterborough’s.
- Not ideal for tight or irregular cavities — that’s where spray foam or drill-and-fill is worth the extra cost.
Get Your Fiberglass Blown-In Insulation in Peterborough Today
Frequently Asked Questions
Is fiberglass or cellulose better for a Barrie attic?
Both reach R-60 and both are rebate-eligible. Cellulose is denser and needs less depth; fiberglass is lighter and usually more affordable. We recommend based on your specific attic, not a default.
Do you actually service Barrie?
Yes — Peterborough is part of our regular service area. We’re based in Markham and work throughout the region.
How deep does blown-in fiberglass need to be?
Roughly 20–24 inches of settled material to reach R-60, the Ontario attic standard.
Do I need to remove my old insulation first?
Only if it’s contaminated by mould, water, or rodents. Otherwise we blow new fiberglass over the existing layer and the R-values add together.
Will it help with drafts in my Barrie home?
It insulates well but doesn’t air-seal on its own. If drafts are the main issue, we may recommend pairing it with air sealing — we’ll explain at the inspection.
Do I have to leave my home during
No. We don’t use hazardous materials, so you and your family can stay home.