Insulation Supplier Serving Ontario
Tax-in pricing, local pickup, fast delivery
Our Best-Sellers
XPS
Our top pick for foundations, basements, and exterior walls. Closed-cell extruded polystyrene with interlocking shiplap edges — water-resistant, holds its R-value below grade, and strong enough for under-slab use.
Starting at $2.50/ft² tax-in!
Fiberglass
The fast, budget-friendly favourite for walls, basements, and DIY projects. Sized for standard 24" or 16” framing, easy to cut and install, great for comfort and soundproofing.
Starting at $0.34/ft² tax-in!
Rockwool
The premium choice when fire safety and sound control matter. Non-combustible, water-repellent, and excellent acoustic damping — ideal for party walls, mechanical rooms, and continuous insulation. And rodents can't chew through it.
Starting at $1.50/ft² tax-in!
Our Process
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Call, email, or message us with your project — or just the products and quantities. Not sure what's right for the job? We'll help you figure it out.
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We'll send you our offer, with tax-included. Orders over $1,000 automatically save an additional 5%. No hidden fees, no surprises.
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Grab it from our North Dundas warehouse (10 AM–3 PM Monday to Saturday, or by appointment), or we'll deliver across Ontario — often same day!
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Locally stocked, fairly priced, and backed by people who actually know insulation. Need more for the next job? We're a phone call away.
Locally Stocked, Ready to Go!
Our North Dundas warehouse is packed and ready — no backorders, no long waits. Deliveries are usually delivered within 48 hours, if not in the same day! Skip the special-order delays of the big-box stores: what you need is on our shelves now, priced fairly and ready for pickup or delivery.
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We work hard to keep insulation affordable without compromising on quality. Selling reliable products at unbeatable pricing!
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Whether you need a few bundles or a full truckload, we’re equipped to handle projects of any size.
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Delivery anywhere in Ontario, directly to your home, job site, or warehouse. Often, in the same day! Reach out for a quote.
Customer Reviews
“ThermaSource exceeded all my expectations. I compared several companies in the region, and their pricing offered the best value by far. The team was professional, honest, and incredibly knowledgeable, making the whole process smooth and stress-free. It’s rare to find a company that combines affordable prices with such outstanding quality and service. Highly recommend!”
— Elisabet hernandez“Very good experience. Quality products, prices lower than on the market, and super pro customer service. I recommend without hesitation for those who want to equip themselves well.”
— Gatsing nell“Great insulation and amazing prices. Thank you for your help.”
— Maha miq