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RE: Making a Kiln11/13
Can I make a kiln out of 4x8 4-inch thick insulation panels on a concrete floor?
What can I heat it with? And do I need a fan?
The kiln is going to dry small pieces of hardwoods, an inch or less thick.
Sure you can!
Yes you need a fan or two.
I use a modified electric baseboard heater to heat my foam insulated DH kiln. Bypassed the factory safety thermostat and added one from a hot water heater. 140 degrees max.
Foam has heat restrictions, i.e. it has a melting point.
A bare cement floor is a very big heat sink and wastes a lot of heat but it's solid. Might want an insulated floor.
Sometime back I saw on the web a kiln using foam where the a load was stacked up and then a foam top, like a cover on a cake carrier, was lowered over the whole pile by two men. Then the heating unit was attached and the on button was pushed. I believe the whole thing was being touted as "new" technology in drying wood. It was a lot larger than what your looking for. Can't find it now.