945 Main St.       
Sanford, ME 04073       
Phone: 207-608-0564       
   Email: FrechetteChimney@yahoo.com       

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Types of Liners

Thermocrete® is a premium, durable ceramic liner for use in the repair, restoration and energy conversion of chimneys and chimney flues. Thermocrete seals holes and cracks, increases efficiency, and strengthens the chimney. Thermocrete makes it easy to retrofit chimneys for conversion to natural gas. Installation is quick, cost effective and environmentally friendly. And unlike traditional fuel conversion methods, Thermocrete requires no major construction and does not reduce the diameter of the flue. 
Why Get a Liner?

Fire Safety

If you burn wood with an unlined chimney or a damaged liner your creating a fire hazard. Chimney fires burn hot enough that framing around the chimney can catch fire right through a layer of brick. The liner is your homes essential layer of fire protection.

Improved Performance

A properly-sized flue creates the ideal draft for your furnace, water heater, fireplace or stove. Over-sized flues (often the case when the flue is unlined) tend to provide too weak a draft for modern appliances. A chimney liner will help improve the draft, which in turn improves the operation of the appliance.

Easier, more effective cleaning

​Ask any chimney sweep on the planet which is easier to clean: an unlined chimney, or one with a properly sized liner. The lined chimney is always easier to clean, because the improved draft means less condensation of smoke and gasses (less soot and creosote buildup) and the flue is an even, consistent size with an even surface that the brushes can clean effectively.

Long-term preservation

Aside from chimney fires, earthquakes, falling trees and the like, the number one killer of chimneys is water. Especially in northern climates, freeze-thaw cycles slowly break chimneys apart. You’ve probably seen chimneys with missing bricks, or chimneys leaning to one side due to years of wind-driven rain soaking into the masonry. But water damage can happen on the inside, too. Water vapor is one of the components in flue gasses. In the case of chimneys that are used to vent gas-fired appliances in particular, the inside is sometimes literally soaking wet, just from condensing water vapor.

A chimney liner acts as a barrier against interior damage from condensation, protecting the inside of the chimney from gradual decay cause by water penetration.

- Insulation around the stainless steel pipe is part of the liner system. Its purpose is to keep the inside of the flue hot, and the outside of the chimney cool, for the sake of fire safety and optimal performance. Depending on the type of installation, we use either a foil-faced ceramic blanket or a lightweight masonry insulation.

- As part of a regular chimney inspection we will check the liner and let you know if a new liner is needed.

Have a question about your liner or a re-lining? 
Types of Liners

Stainless steel flexible piping is manufactured by forming a continuous strip of ribbed metal into a spiral and connecting it to make a tube. “Seam welded” means that as the tube is formed, the strip is welded, and not folded or crimped together. With some liner products it’s crimped, or folded over on itself into a sliding channel. Crimped liners are also flexible, but only the seam-welded pipe is completely waterproof, and a welded seam is super-rugged and less prone to separation.

Is a heavier liner better?

Some liners, particularly the type that involves a seam that’s rolled over onto itself and crimped into a sliding channel, can be extremely heavy. While you might think heavier-is-better, what’s more important is the type of material and how it’s formed. The corrugated surface of our liner gives it great strength, and the alloys used (matched to the type of fuel you use) are designed for optimal longevity. A very heavy liner of an inferior alloy will actually under-perform significantly compared to our stainless steel liners.
Thermocrete® Chimney before and after
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