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I actually gave expandable foam some consideration as well. Are there versions that have enough fire resistance? The stuff I have laying around the house is highly flammable.

anyone used a welders blanket to insulate a brew kettle on a stovetop? How well does it work?

What do you think of a welders blanket?

Should have mentioned that I'm brewing on a ceramic stove top. After mash, the lid goes on the brew pot and is boiling in 20-30 minutes. But after the lid comes off, I'm not able to keep a good rolling boil. With silicone rated at 400F and starting two inches above the pot, I'm not too worried...

Read a lot of threads with people adding various types of insulation around a brew pot. No one seemed to have any homerun recommendations. Any thoughts on using a silicone sheet (rated 450F) around a 6 gallon pot? Anyone have any experience with the stuff or recommendations on manufacturers?