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Post by alexjh on Jul 27, 2015 12:42:30 GMT
Hi I'm new to the forum so though I would say Hi. After reading a million posts on ovens I have built my own.
Basically, base is 9" of per-crete that hangs on the garage wall. over that is 1-2" of normal concrete with storage heater bricks set on that. Oven is 3" of home-brew refectory concrete cast in situ over a sand former, 75mm of superwool insulation and 10-20mm of render.
Most of the concrete was cast over a week ago now. I have had a couple of proving fires and air flow looks good. I had a big fire last night but struggled to get up to temp (maxed out at 200C) - there is probably quite a bit of moisture in the concrete still so not panicking just yet. I am aware that I have a lot of thermal mass in the base so I am worried about getting up to temp in general terms. Attachments:
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Post by cobblerdave on Jul 28, 2015 21:31:10 GMT
G'day
It will come as a shock on how hard it is to fire wet oven. Getting the water out takes a lot of energy. That pearcrete has a lot of spaces for the water to be retained in. Fire the oven and let it sit in between firings so the water has time to migrate to the dry surfaces so the next fires will remove it. Just a job of patients
Regards dave
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Post by alexjh on Jul 28, 2015 21:56:32 GMT
Yes, fired again last night, took a bit of effort but go the base up to 250C and the dome to 450C.
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Post by cobblerdave on Jul 29, 2015 0:56:39 GMT
G'day
Water boils at 100C I litreof water makes 1500 liters of steam. That's a lot of expansion happening deep in a he ovens structure. Low and slow and leave the oven to cool between firings.
Heating the oven to the highest doesn't do any better at drying it out and can only make it easier to crack it.
By the way that's a nice looking oven
Regards dave
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