The LECA 50L Bag is a high-performance lightweight expanded clay aggregate designed for use around flues and chimney stacks. Engineered to improve flue draw and thermal efficiency, LECA provides a stable, insulating surround that helps retain heat where it is needed most, improving appliance performance and overall system efficiency.
Manufactured with a unique cellular inner structure, LECA offers excellent insulation properties while remaining exceptionally lightweight, making it easy to handle and install. Unlike alternative infill materials, LECA is completely insoluble and will not break down over time, ensuring long-term reliability within chimney systems. This makes it an ideal choice for insulating chimney stacks, flue liners, and voids where durability and thermal performance are essential.
Widely used in stove and fireplace installations, the LECA 50L Bag is suitable for both domestic and commercial applications. Its combination of insulation, stability, and moisture resistance makes it one of the most trusted materials for chimney and flue insulation projects.






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