Dry earth, sand, slag or glass wool.

If you have not yet come to the decision, whether you need to warm your chimney at all, which method is better to use for this, you can try a universal and very simple way of high -quality insulation. It is necessary to make a special frame of wood for the chimney. Stop the frame with asbestos (slate) slabs and fix it around the pipe. The space between wood shields and the chimney is filled with the simplest insulation. Dry earth, sand, slag or glass wool.