Heat break

[Dwatkins]

Question.
I have been planning to stuff small strips of ceramic blanket in the gap that I left between the dome and the chimney throat and have been researching high temp caulk to seal it off. If the HT caulk, once brought up to temp, becomes very hard and probably transfers heat, would it be just as efficient to use Heat Stop 50 to fill the void once the blanket strips are inserted?

[david s]

Yes, I do the same, but seal off the blanket with some 6:1 vermicrete, which remains a bit flexible. Sieved heatstop mixed with the vermiculite or perlite would be better.