How Thermocrete® Lines and Protects Your Chimney

Chimneys do more than vent smoke; they protect your home from heat, fire, moisture, and toxic gases. But over time, the chimney can deteriorate, crack, or lose its ability to contain combustion byproducts. That’s where Thermocrete® comes in.

Thermocrete® is a specialized chimney lining material that restores, reinforces, and protects damaged chimney flue liners and is mainly used as an alternative to clay tile liners or metal liners, especially in older or deteriorating chimneys. Thermocrete® isn’t always the right solution, but let’s look at when it is and how it can help you avoid costly repairs and safety issues.

What is Thermocrerte?

Thermocrete® is a durable ceramic liner used by professionals to repair and restore chimneys and chimney flues. It seals holes and cracks, improves energy efficiency, and can strengthen the chimney. If you want to convert your fireplace to gas, Thermocrete® is an ideal retrofit.

How Thermocrete® Protects Your Chimney

The great thing about this product is that it provides your chimney with multiple layers of protection that work together to extend its lifespan and improve efficiency. Here’s what it does.

Seals Cracks and Gaps

As chimneys age, the interior liner can crack or crumble due to heat, moisture, and freeze-thaw cycles. Thermocrete® fills these cracks, which can bolster the chimney flue’s structural integrity.

Improves Fire Safety

When the liner gets damaged, it can allow smoke and carbon monoxide to seep into the walls or the living room. A Thermocrete® liner makes a continuous, gas-tight pathway that enables dangerous gases to vent properly.

Resists Moisture Damage

Moisture is one of the biggest enemies of chimneys. Thermocrete® helps block water intrusion, reducing damage caused by condensation, acidic flue gases, and masonry deterioration.

Strengthens the Chimney’s Structure

In many situations, Thermocrete® lines and reinforces the chimney. This material bonds to the existing masonry, making it stronger and more stable, which is ideal if your flue walls have been weakened over time.

When Should You Use Thermocrete®?

Thermocrete® isn’t right for every situation, but here’s where it’s ideal.

Your Clay Liner is Cracked or Deteriorating

If you’ve had your chimney inspected and cracks were found, or if you have missing clay tiles, Thermocrete® can restore the flue without a complete chimney rebuild.

Your Chimney is Failing a Level 2 Inspection

An inspector might find during a real estate inspection that the liner has been damaged, either by a fire or by old age and neglect. Thermocrete® is commonly used to bring old chimneys back into code compliance.

You Have Poor Draft or Smoke Issues

An uneven or damaged flue disrupts proper venting and airflow. Thermocrete® smooths the interior surface, reducing drafts and helping smoke escape more efficiently.

Your Chimney Has Irregular Dimensions

Older chimneys often have odd shapes that make metal liners difficult or expensive to install. Thermocrete® adapts to these irregularities easily.

Is Thermocrete® Right for Every Chimney?

Not always. If your chimney is severely collapsed or has significant exterior structural damage, rebuilding is usually recommended by professionals. However, it’s always best to have a certified chimney expert inspect your chimney to determine what’s happening and the best way to fix it.

Repair Your Chimney With Thermocrete®

Approved Industries offers advanced ceramic coatings to repair damaged flue liners, making your chimney more efficient. Call us today for more information.