Leca Chimney & Flue Backfill provides a lightweight, stable and insulating surround to the flue improving draw and retaining heat where it is most needed. It has a unique cellular inner structure which provides excellent insulating qualities.
Leca LWA is non-hazardous, inert and is resilient to attack from chemicals, hydrocarbons, and extreme high & low temperatures. It is not affected by water and unlike other backfill material it will not clog when wet.
Simply pour the Leca LWA into the void between the chimney and flue liner either straight from the bag or using a bucket or filler for smaller apertures.
Hotter gases and improved chimney draw
Increased flue efficiency
Reduction of heat loss
Better fuel economy
Significant reduction of tar deposits
Increased flue life span
Leca Chimney and Flue Backfill bags weigh a nominal 15kg, well within the H&SE recommendations for a single-man lift. Leca® Chimney and Flue Backfill is chemically neutral and does not contain any environmentally harmful constituents. It is safe to handle and does not need any special protective clothing or special requirements for disposal.