Originally Posted by RiverCityBrewer
I use a carbon fiber welding blanket as they can handle a direct flame and high temps for extended periods. The downside is they are rather pricey and after about a year of use mine is starting to show its age and is looking rather worn.
I picked up the blanket from McMaster-Carr over a year ago. It's enough to go around the keg mash tun several times. I don't remember the exact size of it, but I have one thickness glued to the keg mash tun and another that goes around it 1-1/2 times. I still have some left over too. The combination of those typically is enough to fight the colder temperatures.
I also have some reflectix insulation that I'm thinking about using as a slip-over heat shield. I'll need to remove it whenever fire is applied to the keg though. BUT, it can work to add more insulation to the mash tun in the cold months. If you decide to use reflectix, be sure to NOT leave it on when you use the burner. Otherwise, it WILL melt on you. At least the lower 1/2-1/3 of it will.