Re: insulation
Owens-Corning specifies an operating temperature up to 250*F for their fiberglass insulation. An interesting addendum states a break-down temperature of 650*F. While spun glass should handle temperatures in excess of 1000*F, it could be the binders used during manufacture that limits temperature. You should be ok using fiberglass for a PC oven but I wouldn't try to use it above normal powder curing temperatures.
Save yourself some money and just use R11. That's about all you'll get trying to compress 10 inches of insulation (R30) into a four inch wall. The more you compress the insulation, the greater the loss of insulating value. It's NOT the fiberglass that provides the insulation, it's the air gaps between the fibers.
Ken
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