Blow-in insulation is a loose-fill insulation material that is mechanically blown into place using specialized equipment — filling attic floors, wall cavities, and hard-to-reach spaces that traditional batt insulation simply cannot access. Unlike pre-cut fiberglass batts, blown-in insulation conforms perfectly to irregular joists, around obstructions, and into corners, eliminating the gaps and voids that cause heat loss. It can be installed on top of existing insulation to boost your R-value, or used as a complete insulation solution in new construction and full retrofits.

Most Ontario homes built before 2010 have attic insulation in the R-10 to R-32 range — well below the current building code minimum of R-60. A professional blow-in insulation upgrade brings your home up to code, dramatically improves thermal performance, and can reduce heat loss through your attic and walls by up to 80%.

Constant Home Comfort installs both of the two most widely used blow-in insulation materials. During your in-home consultation, our team will assess your space, your current R-value, and your goals — and recommend the material that delivers the best performance for your specific home.

Fiberglass Blow-in Insulation

Made from spun glass fibres, fiberglass blown-in insulation is non-combustible, moisture-resistant, and resistant to mold and mildew — making it an excellent long-term choice for Ontario's climate. It provides reliable thermal performance with an R-value of approximately R-2.2 to R-2.7 per inch and settles less over time than cellulose. Fiberglass blow-in is often the preferred material for attics where fire resistance and durability are top priorities.

Cellulose Blow-in Insulation

Cellulose insulation is made from recycled paper fibre treated with fire-retardant compounds, making it one of the most environmentally friendly insulation options available. It has a higher density than fiberglass, which makes it particularly effective at filling wall cavities and reducing air infiltration. With an R-value of approximately R-3.2 to R-3.8 per inch, cellulose delivers excellent thermal performance and is an ideal choice for homeowners looking to improve both energy efficiency and their environmental footprint.

Blow-in insulation's greatest advantage is its versatility. Our certified technicians can install it virtually anywhere in your home where heat loss is occurring:

• Attic floors — the single most impactful insulation upgrade for most Ontario homes, reducing heat loss through the ceiling and protecting your roof from ice dams
• Open attic cavities — blown directly over existing insulation to top up R-values to current building code levels
• Exterior wall cavities — installed through small access holes in existing drywall or siding with minimal disruption, then patched and finished
• Interior walls — for improved sound insulation between rooms and floors
• Basement rim joists and header areas — one of the most commonly overlooked sources of heat loss in older Ontario homes
• Garage ceilings — particularly important if you have a heated room above an attached garage
• Cathedral ceilings and sloped roof sections — where batt insulation is difficult or impossible to fit properly

Every home in Ontario faces the same challenge: extreme cold in winter and intense humidity in summer, with energy bills that reflect every gap in your building envelope. Blow-in insulation directly addresses that challenge with a combination of benefits that no other upgrade can match at the same price point:

• Immediate reduction in heat loss — up to 80% less heat escaping through an insulated attic compared to a poorly insulated one
• Lower monthly energy bills — most Ontario homeowners see measurable savings on their gas and hydro bills within the first heating season
• Consistent temperatures throughout your home — no more freezing second-floor bedrooms in January or stuffy top floors in summer
• Reduced strain on your HVAC system — when your home holds temperature more efficiently, your furnace and air conditioner run less, extending equipment life
• Improved indoor air quality — blown-in insulation fills gaps where outdoor allergens, dust, and pollutants enter your home
• Faster installation than any other insulation type — most attic jobs are completed in a single day with minimal disruption
• Compatible with existing insulation — can be layered on top of what you already have, so you only pay for what your home actually needs
• Potential eligibility for Ontario government rebates — reducing or eliminating your upfront cost

Our certified insulation technicians follow a precise, code-compliant installation process designed to maximize the performance of your upgrade while protecting your home and family throughout. Here's what to expect when you book a blow-in insulation installation with Constant Home Comfort:

Pre-Installation Inspection. Before any material is blown in, our team conducts a thorough inspection of the installation area — checking current R-values, identifying air leaks, assessing ventilation, and locating any moisture issues or structural concerns that need to be addressed first. We measure carefully so you receive exactly the insulation your home needs to meet R-60 (or higher) without overpaying.

Air Sealing. Insulation alone is only part of the solution. Our technicians seal gaps around pot lights, plumbing penetrations, wiring, and HVAC ducts before blowing in insulation — because air sealing and insulation work together to stop heat loss. This step alone can significantly improve your home's energy performance.

Soffit Baffle Installation. To protect attic ventilation and prevent condensation issues, we install soffit baffles (also called rafter vents) along the eaves before blowing insulation — ensuring that airflow from the soffits to the ridge vent is never blocked, which is critical for roof health and preventing ice dams.

Blow-in Installation. Wood sheeting is laid on the attic floor so technicians can work safely without stepping through the ceiling. Insulation is then blown in systematically from the farthest corners toward the access hatch, ensuring complete and even coverage. Depth gauges are placed throughout the attic to confirm the correct R-value is achieved across the entire space.

Final Inspection and Cleanup. Once installation is complete, our team conducts a final walkthrough, removes all equipment and protective sheeting, and leaves your home as clean as they found it. We provide a written confirmation of the installed R-value and material used for your records and any applicable rebate applications.

Ontario homeowners who upgrade to blow-in insulation may qualify for substantial rebates and incentives through government and utility programs — potentially reducing your project cost by hundreds or even thousands of dollars. Constant Home Comfort is a registered contractor under Ontario's Home Renovation Savings Program (delivered through Enbridge Gas and Save on Energy), which means we verify your eligibility, prepare your application, and submit everything on your behalf at no extra cost.

Current programs that may apply to your blow-in insulation upgrade include:

• Enbridge Home Efficiency Rebate Plus (HER+) — rebates of up to $2,350 for qualifying attic insulation upgrades for Enbridge Gas customers
• Ontario Home Renovation Savings Program — rebates available when insulation is combined with other eligible energy efficiency upgrades such as a heat pump
• Canada Greener Homes Grant — federal funding for eligible home energy improvements including insulation (eligibility rules apply; program subject to funding availability)
• Comfort Bundle Rebates — when you pair a blow-in insulation upgrade with a qualifying heat pump installation, combined rebates of $2,500 to $4,100 may apply

Rebates are first-come, first-served and subject to program availability. Call 1-888-675-5907 today to check your eligibility before funding runs out.

Not sure if a blow-in insulation upgrade is right for your home? These are the most common warning signs that your insulation is underperforming and costing you money:

• Second-floor bedrooms are noticeably colder in winter or hotter in summer than the rest of the house
• Your furnace or air conditioner runs constantly but can't maintain a steady temperature
• Energy bills have been steadily climbing despite no change in usage habits
• You have ice dams forming on your roof each winter — a direct result of heat escaping through a poorly insulated attic
• Your home was built before 2010 and the insulation has never been assessed or upgraded
• You can see less than 16 inches of insulation across your attic floor
• Drafts or cold spots near walls, ceilings, or around pot lights

If your home shows one or more of these signs, the investment in blow-in insulation pays for itself quickly — and may qualify for rebates that dramatically reduce your upfront cost.

Constant Home Comfort has been serving Ontario homeowners across the GTA, Hamilton, Ottawa, London, Waterloo, and Barrie with honest, high-quality home comfort solutions for years. We are not a one-trade contractor — we are your single point of contact for the full range of home energy improvements, which means we understand exactly how insulation, heating, cooling, and ventilation work together as a system. When you call us for blow-in insulation, you get:

• Certified, experienced insulation technicians — not subcontractors — who know Ontario's building code and installation standards inside and out
• A free in-home assessment before any work begins — full transparency on your current R-value, what your home needs, and what it will cost
• Rebate management included — we identify every program you qualify for and handle the paperwork on your behalf
• Full disclosure pricing — no surprises on installation day
• $0 down, 0% interest financing available on approved credit — so you can upgrade now and start saving immediately
• Service across the entire province — GTA, Hamilton, London, Ottawa, Waterloo, Barrie, and surrounding areas

How long does blow-in insulation installation take?

Most attic blow-in insulation jobs are completed in a single day, often within 2–4 hours depending on the size of the attic and the amount of preparation required. Wall cavity installations may take longer depending on access and the number of areas being treated.

Can blow-in insulation be installed over existing insulation?

Yes. In most cases, blown-in insulation can be applied directly on top of existing fiberglass batts or older loose-fill insulation to boost your R-value to the current code minimum of R-60. Our team assesses what's already in place and calculates exactly how much additional insulation is needed.

Does blow-in insulation settle over time?

All loose-fill insulation settles somewhat after installation. Fiberglass blow-in settles less than cellulose. Our technicians account for settling when calculating the installed depth — so your finished R-value after settling meets your target performance level.

Will blow-in insulation reduce my energy bills?

Yes, in virtually every case. The amount of savings depends on your home's current insulation levels, your heating and cooling system, and local energy rates — but Ontario homeowners who upgrade from below-code insulation to R-60 typically see meaningful reductions in their monthly energy bills within the first heating season.

Is there a minimum R-value required by Ontario building code?

Yes. Ontario's current building code requires a minimum of R-60 for attic insulation in new construction and renovations. Many homes built before 2010 fall significantly below this standard, making them eligible for upgrade rebates and a substantial improvement in thermal performance.

Stop letting heat — and money — escape through your attic and walls. Constant Home Comfort's certified technicians serve homeowners across the GTA, Toronto, Markham, Hamilton, Ottawa, London, Waterloo, Barrie, and all of Ontario with professional blow-in insulation installation backed by full transparency, honest pricing, and complete rebate management.

Call 1-888-675-5907 to book your free in-home assessment. We'll check your current insulation levels, confirm your eligibility for Ontario rebates, and give you a complete quote — before any work begins, with no pressure and no surprises.

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