Turned on the hot pad under my mash tun, figured I try pre heating it. Forgot to put the temp probe in the tun...cooked the celotex off the bottom. Luckily caught it right away. Tun seems no worse for the wear, ran perfectly(after a good cleaning with baking soda). Once again, luckily, my niece sold Mom a vacuum and an air purifier/filter a few years ago(and I only live a couple miles from my parents). Thanks to the magic of air purifying filtration, the house no longer smells of burnt insulation, the beer is in the fermenter and my wife will allow me to live another day.