[taiwanpizzaman]

Hi guys

Thanks for your input. I've used a door with a thermometer in it. The initial temperature with only the bed of coals and ashes goes up to 160 degrees celcius and then quiclkly drops to 140 degrees in about twenty minutes. Over the next two hours it drops to about a 100 degrees which it holds for five hours. After about twelve hours the temperature is between seventy and eighty degrees.

The hearth base consists of 10cm concrete, 10cm building sand and then black firebricks. These firebricks are used for the temple furnaces and are rated to 1000 degrees celcius. They hold the heat extremely well, they remain warm eighteen hours after firing. I've included some pics.