Professional Attic Insulation Services in the GTA

Upgrade your home’s energy efficiency and comfort. As Toronto's trusted exterior experts for over 40 years, we install premium Climatizer blown-in cellulose insulation to keep your home warm in the winter, cool in the summer, and your energy bills low.

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Request Your Free Attic Insulation Estimate Today!

Homestar's 2023 'Best of Award' Champions

Peter & Greg Walker Contracting Inc.

Protecting Your Home from the Top Down

For over four decades, Peter & Greg Walker Contracting has been the Greater Toronto Area's premier choice for roofing and exterior remodelling. We know that a truly secure, comfortable home requires more than just a great roof; it requires a properly insulated attic. By adding premium blown-in cellulose insulation to our trusted lineup of services, we are extending our commitment to protecting your home. Our expert team ensures your thermal envelope is sealed, helping you lower your utility bills and keep your family comfortable year-round.

Why Choose Blown-In Cellulose Insulation?

We use loose-fill, blown-in cellulose because it is simply one of the most effective ways to protect Canadian homes against harsh winter weather.

Superior Energy Efficiency

Blown-in cellulose densely fills every gap, crack, and crevice in your attic. This provides exceptional heat retention during freezing Toronto winters and keeps your home pleasantly cool at the height of summer.

100% Eco-Friendly

Made from 85% locally sourced, post-consumer recycled paper, our cellulose insulation is an environmentally sustainable choice with a remarkably low carbon footprint.


Fire & Pest Resistant

Treated with safe, non-toxic additives, our insulation acts as a powerful deterrent against mold, mildew, rodents, and pests, while also boasting a Class-1 fire resistance rating for your peace of mind.

Superior Energy Efficiency

Blown-in cellulose densely fills every gap, crack, and crevice in your attic. This provides exceptional heat retention during freezing Toronto winters and keeps your home pleasantly cool at the height of summer.

100% Eco-Friendly

Made from 85% locally sourced, post-consumer recycled paper, our cellulose insulation is an environmentally sustainable choice with a remarkably low carbon footprint.


Fire & Pest Resistant

Treated with safe, non-toxic additives, our insulation acts as a powerful deterrent against mold, mildew, rodents, and pests, while also boasting a Class-1 fire resistance rating for your peace of mind.

A Homeowner's Guide to Understanding Attic Insulation

Maintaining Your Home's Thermal Envelope

Once your new cellulose insulation is installed, it requires virtually zero maintenance! However, to ensure your attic system functions perfectly for decades, keep these three tips in mind:

Ensure Proper Ventilation

Insulation works hand-in-hand with your roof vents (soffits and ridge vents). Never block these vents, as airflow is critical to preventing moisture buildup.

Check for Roof Leaks

A healthy roof protects your insulation. If you notice missing shingles or ceiling stains, call us for a quick roof repair before water can saturate and compress your attic insulation.

Watch for Pests

While our cellulose is treated to resist rodents, always make sure your exterior roofline and eaves are sealed tight against wildlife entry.

Mind Your Storage Space

Blown-in cellulose works by trapping tiny pockets of air. If you use your attic for storage, avoid placing heavy boxes or boards directly on top of the insulation.

The ROI of Attic Insulation

Did You Know?

Upgrading your attic insulation is one of the smartest, most cost-effective home improvements you can make.


  • Slash Your Energy Bills: Homeowners can save anywhere from 20% to 50% on their heating and cooling costs simply by bringing their attic insulation up to modern R-value standards.
  • Fast Return on Investment: Because it drastically lowers your monthly utility bills, upgrading your attic insulation often pays for itself within just a few years.
  • Extend Your Roof's Lifespan: Proper insulation prevents "ice damming" in the winter by keeping your roof deck at an even, cold temperature, saving you from costly roof leaks and shingle damage.

Upgrading your attic insulation is one of the smartest, most cost-effective home improvements you can make.


Slash Your Energy Bills: Homeowners can save anywhere from 20% to 50% on their heating and cooling costs simply by bringing their attic insulation up to modern R-value standards.

Fast Return on Investment: Because it drastically lowers your monthly utility bills, upgrading your attic insulation often pays for itself within just a few years.

Extend Your Roof's Lifespan: Proper insulation prevents "ice damming" in the winter by keeping your roof deck at an even, cold temperature, saving you from costly roof leaks and shingle damage.

Get 10% Off Your Attic Insulation Today

Financing is available, contact us for more!

For a limited time, Peter & Greg Walker Contracting is offering a 10% Discount on all new attic insulation installations. Don't let your hard-earned money escape through your roof!

What Our Happy Customers Are Saying:

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"We got 3 quotes, with Walkers being the last. The salesman Brian took photos of our roof and attic then went through great detail educating us on the current condition of our roof from the inside out. Although it had been replaced about 20 years ago, given our 100 year old home, the venting, baffling and insulation were never done properly, thus we had great moisture problems in our home. Brian went on to explain exactly what was going to be done, the benefit of each step, and we got what we paid for. We were also given more photos of the attic and roof after job completion. From execution of steps to the cleanliness of the site during and after each day of work was well worth the price. Not only that, but Blerta the office and customer care manager is an exceptional communicator who kept us updated on project details. We're very happy with the process and final product."

- Katarina S.

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Our 5-Step Approach to Insulation Excellence

Assess the Attic and Remove Old Insulation

We begin with a detailed assessment of the attic to evaluate the condition of the existing insulation and identify areas that may require special attention.


The existing insulation is then carefully removed as required. Removing old, damaged, contaminated, compressed, or ineffective insulation allows us to properly access the attic floor and inspect areas that may otherwise be hidden.


During this stage, we look for potential concerns such as air leakage, moisture, damaged insulation, inadequate ventilation, and other visible conditions that could affect the performance of the new insulation.


Once the old insulation has been removed, the attic is prepared for air sealing and installation of the new insulation system.

Air Seal, Seal Fixtures and Improve Ventilation

Before installing new insulation, we inspect the attic for openings, gaps, penetrations, and other areas where heated or conditioned air may escape from the living space into the attic.


Where appropriate, these areas are sealed using spray foam or other suitable air-sealing materials. Particular attention is given to common leakage points, including plumbing and electrical penetrations, wiring openings, framing gaps, attic penetrations, and other accessible openings between the conditioned living space and attic.


We also inspect accessible light fixtures, exhaust fans, and other ceiling penetrations and seal them using appropriate methods while maintaining required clearances and safety requirements.


Proper attic ventilation is equally important. Existing ventilation pathways are inspected, and new attic baffles are installed where required. Baffles help maintain a clear ventilation channel at the soffits so outside air can move properly through the attic without the new insulation blocking airflow.


This combination of air sealing and ventilation preparation helps reduce unwanted heat loss, drafts, and air movement while allowing the attic ventilation system to function correctly.

Install New Cellulose Insulation to R-60

Once the attic has been properly prepared, we install new blown-in cellulose insulation.


The cellulose is evenly distributed throughout the designated attic area to achieve the required installed depth and thermal resistance. Special attention is given to maintaining consistent coverage and minimizing low spots or areas where insufficient insulation could reduce overall performance.


The insulation is installed to achieve an R-60 thermal resistance level, subject to applicable building-code requirements, product specifications, attic conditions, and required clearances.


Care is also taken around ventilation areas, attic access points, fixtures, mechanical equipment, and other components so that insulation does not interfere with required ventilation or safe operation.


The result is a properly insulated attic designed to significantly reduce heat transfer between the home and attic space.

Final Inspection and Completion Certification

After installation, we perform a final inspection of the completed work.


We verify that the insulation has been installed to the required coverage and depth, ventilation pathways remain unobstructed, and the areas included in the scope of work have been properly completed.


Any required finishing details are addressed before the project is considered complete.


Upon satisfactory completion, the homeowner is provided with applicable documentation or certification confirming the attic insulation work performed, including the insulation level achieved where applicable.

Homeowner Walkthrough, Maintenance and Warranty Review

The final step is a walkthrough with the homeowner.


We review the completed work and explain the improvements that were made to the attic, including insulation, air sealing, and ventilation work included in the project.


We also discuss recommended attic maintenance and important considerations for future work. For example, homeowners should be aware that future electrical, plumbing, HVAC, roofing, or renovation work in the attic can disturb insulation or affect air sealing and ventilation.


Finally, we review the applicable product and workmanship warranties, explain what is covered, and answer any questions the homeowner may have.


Our goal is to leave every client with a clear understanding of the work completed, how their upgraded attic insulation system functions, and how to maintain its performance for years to come.

Assess the Attic and Remove Old Insulation

We begin with a detailed assessment of the attic to evaluate the condition of the existing insulation and identify areas that may require special attention.


The existing insulation is then carefully removed as required. Removing old, damaged, contaminated, compressed, or ineffective insulation allows us to properly access the attic floor and inspect areas that may otherwise be hidden.


During this stage, we look for potential concerns such as air leakage, moisture, damaged insulation, inadequate ventilation, and other visible conditions that could affect the performance of the new insulation.


Once the old insulation has been removed, the attic is prepared for air sealing and installation of the new insulation system.

Air Seal, Seal Fixtures and Improve Ventilation

Before installing new insulation, we inspect the attic for openings, gaps, penetrations, and other areas where heated or conditioned air may escape from the living space into the attic.


Where appropriate, these areas are sealed using spray foam or other suitable air-sealing materials. Particular attention is given to common leakage points, including plumbing and electrical penetrations, wiring openings, framing gaps, attic penetrations, and other accessible openings between the conditioned living space and attic.


We also inspect accessible light fixtures, exhaust fans, and other ceiling penetrations and seal them using appropriate methods while maintaining required clearances and safety requirements.


Proper attic ventilation is equally important. Existing ventilation pathways are inspected, and new attic baffles are installed where required. Baffles help maintain a clear ventilation channel at the soffits so outside air can move properly through the attic without the new insulation blocking airflow.


This combination of air sealing and ventilation preparation helps reduce unwanted heat loss, drafts, and air movement while allowing the attic ventilation system to function correctly.

Install New Cellulose Insulation to R-60

Once the attic has been properly prepared, we install new blown-in cellulose insulation.


The cellulose is evenly distributed throughout the designated attic area to achieve the required installed depth and thermal resistance. Special attention is given to maintaining consistent coverage and minimizing low spots or areas where insufficient insulation could reduce overall performance.


The insulation is installed to achieve an R-60 thermal resistance level, subject to applicable building-code requirements, product specifications, attic conditions, and required clearances.


Care is also taken around ventilation areas, attic access points, fixtures, mechanical equipment, and other components so that insulation does not interfere with required ventilation or safe operation.


The result is a properly insulated attic designed to significantly reduce heat transfer between the home and attic space.

Final Inspection and Completion Certification

After installation, we perform a final inspection of the completed work.


We verify that the insulation has been installed to the required coverage and depth, ventilation pathways remain unobstructed, and the areas included in the scope of work have been properly completed.


Any required finishing details are addressed before the project is considered complete.


Upon satisfactory completion, the homeowner is provided with applicable documentation or certification confirming the attic insulation work performed, including the insulation level achieved where applicable.

Homeowner Walkthrough, Maintenance and Warranty Review

The final step is a walkthrough with the homeowner.


We review the completed work and explain the improvements that were made to the attic, including insulation, air sealing, and ventilation work included in the project.


We also discuss recommended attic maintenance and important considerations for future work. For example, homeowners should be aware that future electrical, plumbing, HVAC, roofing, or renovation work in the attic can disturb insulation or affect air sealing and ventilation.


Finally, we review the applicable product and workmanship warranties, explain what is covered, and answer any questions the homeowner may have.


Our goal is to leave every client with a clear understanding of the work completed, how their upgraded attic insulation system functions, and how to maintain its performance for years to come.

Premium Quality Backed by Iron-Clad Warranties

We believe in using the best materials on the market, which is why we proudly install Climatizer Plus™ Cellulose Insulation. Manufactured right here in Ontario, Climatizer has over 50 years of experience producing high-performance, eco-friendly loose-fill insulation. Certified by the UL ECOLOGO™ program and rigorously tested by the National Research Council of Canada, Climatizer Plus guarantees maximum thermal comfort and safety.

Climatizer

Lifetime Material Warranty

Your Climatizer insulation is guaranteed to perform for the lifetime of your home.

Peter & Greg Walker Workmanship

5-Year Workmanship Guarantee

Installed by our manufacturer-trained experts, we guarantee a flawless application.

Frequently Asked Questions

  • How much money can I save by insulating my attic in Toronto?

    Depending on the age of your home and your current insulation levels, upgrading to optimal R-values with blown-in cellulose can reduce your heating and cooling costs by up to 20% to 50% annually.

  • Is blown-in cellulose better than fiberglass insulation?

    Yes! Cellulose is much denser than traditional fiberglass batts, giving it a higher R-value per inch. It is exceptional at filling oddly shaped cavities, offers superior soundproofing, and is made from eco-friendly recycled materials.

  • Do you have to remove old insulation before blowing in the new cellulose?

    In most cases, no. New blown-in cellulose can usually be safely applied directly over your existing insulation to boost the overall R-value of your home. During our assessment, we will determine if your old insulation is damp, moldy, or heavily compressed and advise if removal is necessary.