Quick Answer
For a chimney connected to a cookstove, mineral wool or ceramic blanket insulation with a temperature rating of 2000°F (1093°C) is recommended for the flue, while the chase or vent should be insulated with fiberglass or rock wool insulation rated for high-temperature applications.
Insulation Types for High-Temperature Applications
When it comes to insulating a chimney connected to a cookstove, the primary concern is maintaining a safe and efficient exhaust system. Mineral wool or ceramic blanket insulation with a temperature rating of 2000°F (1093°C) is ideal for the flue itself, as it can withstand the extreme heat generated by a cookstove. These types of insulation also provide excellent durability and resistance to heat damage.
Flue Insulation Installation Techniques
To ensure proper flue insulation, wrap the insulation around the flue pipe in a continuous spiral or straight layer, depending on the manufacturer’s recommendations. Leave no gaps or overlaps between the insulation layers, and secure them with wire or tape if necessary. The flue insulation should extend from the top of the cookstove to the vent terminal, or to the point where the flue exits the building.
Chase or Vent Insulation Requirements
The chase or vent surrounding the flue should also be insulated to prevent heat loss and reduce the risk of moisture accumulation. Fiberglass or rock wool insulation rated for high-temperature applications (up to 1200°F or 649°C) is suitable for this purpose. When installing chase or vent insulation, ensure that the insulation is cut to fit snugly around the flue, and seal any gaps or joints with caulk or spray foam to prevent air leaks.
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