What material is commonly used for flue linings in chimneys?

Clay or ceramic materials are commonly used for flue linings in chimneys due to their excellent heat resistance and durability. These materials are well-suited for withstanding the high temperatures and corrosive byproducts generated during combustion. Clay and ceramic linings also provide good insulation properties, helping to maintain the necessary flue gas temperatures and facilitate proper draft in the chimney system.

In addition to their thermal properties, clay and ceramic linings are also resistant to chemical erosion, which is important for maintaining the integrity and safety of the chimney over time. They can effectively prevent the escape of harmful gases, ensuring that the chimney operates efficiently and safely. This makes clay or ceramic linings a standard choice in chimney construction and maintenance practices.

Other materials, while they may have certain applications, do not offer the same level of performance or safety for flue linings. For example, plastic liners are not suitable due to their inability to withstand high temperatures and may melt or degrade. Wood composites lack the necessary fire resistance and structural integrity needed for a chimney liner, while metal sheets can corrode or wear out over time, especially if not made from high-quality, heat-resistant metal.