Thermocrete® gives chimney professionals the ultimate cost-effective solution for relining client flues, with fast installation, easy maintenance, and a lifetime warranty. When flue liners fail due to creosote buildup, corrosion, cracks, or wear, the high heat in the chimney can transfer to nearby combustible materials, resulting in a fire. According to the National Fire Protection Association (NFPA), creosote buildup is the primary cause of structure fires. Thermocrete® is an innovative spray-on liner installed by factory-trained chimney professionals. It is impervious to creosote, sulfuric emissions, and acidic corrosion and is the top choice for commercial buildings.
What Is Thermocrete® Commercial?
Thermocrete® is an advanced ceramic sealant manufactured by Approved Industries, a leading manufacturer of advanced ceramic coatings and thermal protective systems. It is expertly installed by Approved Industries' factory-trained professionals using a uniform spray-on applicator that thoroughly seals all cracks and joints in the flue with a smooth, thermal-resistant surface.
Thermocrete® offers exceptional durability and longevity. Its unique composition renders it impervious to creosote, sulfuric emissions, and acidic corrosion and even outperforms stainless steel liners in terms of resistance to these detrimental factors.
Why Thermocrete® is the Top Choice for Commercial Building Owners
Thermocrete®'s ceramic composition ensures exceptional resistance to high temperatures, corrosion, and creosote, significantly extending service life compared to other liners.
- Superior Corrosion Resistance: Unlike metal liners, Thermocrete® is entirely immune to corrosion from acids, sulfurous emissions, chlorides, and other corrosive agents commonly found in commercial environments.
- ULC-S635 Listed: Guardian Test Labs lists Thermocrete® per ULC-S635, ensuring compliance with stringent safety and performance standards.
- Reduced Maintenance Costs: By eliminating the need for frequent repairs and replacements associated with traditional liners, Thermocrete® significantly reduces long-term maintenance costs for commercial building owners, making it a cost-effective choice.

Thermocrete® Benefits
Thermocrete® offers many superior benefits for commercial use, including:
- Heat resistance: Its unique ceramic composition provides exceptional resistance to high temperatures, making it ideal for withstanding the intense heat generated by modern heating appliances.
- Cost-effective: Thermocrete® liners are a smart investment, as they are easier and less costly to install than other liners, such as terra cotta tile, cast-in-place, and stainless steel, saving you money in the long run.
- External application: Technicians apply the ceramic coating from the top of the chimney, minimizing disruptions to staff or tenants.
- Faster installation: Using traditional methods, a trained technician can apply Thermocrete® to multiple flues in less time than it takes to reline a single flue using conventional methods. Its clean, quick-drying formula (about 30 minutes) means less disruption.
- Environmentally friendly: Our product is made from non-toxic materials and does not contribute to air pollution.
We Specialize in Large Chimneys
Thermocrete® is also an ideal solution for large industrial chimneys. Unlike competing products that require cumbersome foam pads, Thermocrete® is expertly applied by certified installers to chimneys with diameters up to 48 inches and heights exceeding 250 feet. This unique capability, which is exclusive to Thermocrete®, makes it an unmatched solution for protecting the integrity of large-scale industrial and commercial chimney systems, offering a level of versatility and reach that surpasses competing products.
Suitable for a wide range of commercial and industrial applications, including:
- Apartment buildings
- Hospitals
- Hotels
- Office buildings
- Power generation plants
- Factories
- Oil refineries
By providing unparalleled insulation against creosote and other chimney threats, Thermocrete® minimizes the risk of chimney fires and ensures a safer and more efficient operation of heating systems in commercial buildings and industrial facilities.
Thermocrete® Lining for Industrial Facilities
Power plants, manufacturing facilities, and refineries often encounter extreme temperatures, corrosive fumes, and heavy particulate matter. Thermocrete®'s exceptional durability and resistance to these harsh conditions make it an ideal facility maintenance choice for protecting critical chimney and venting systems in these industrial facilities. Its ability to withstand extreme heat, resist corrosion from acidic fumes, and withstand the erosive effects of particulate matter ensures the long-term integrity and reliability of industrial operations.
Where to Buy Thermocrete® Near Me
Transform chimney flues with a heat—and corrosion-resistant ceramic coating by Approved Industries. Thermocrete® is available only to licensed professionals. Ready to become a licensed Thermocrete® installer? Apply here.