Heat Drops fast!

[dimitrisbizakis]

Re: Heat Drops fast!

Even though I used less than 40 litres of water in my build the curing took many, many fires.
You will know when its fully cured as you will go holy sh1t!!!!! this oven burns well.

...until my eyebrows is fully burned!

[dimitrisbizakis]

Re: Heat Drops fast!

Hi Dimitris,
Glad you cooked something and enjoyed the fruit of your labor. How does fire,smells?

..hm, you got a point there!Fire doesn't smell...

[brickie in oz]

Re: Heat Drops fast!

Even though I used less than 40 litres of water in my build the curing took many, many fires.
You will know when its fully cured as you will go holy sh1t!!!!! this oven burns well.

[Laurentius]

Re: Heat Drops fast!

Hi Dimitris,

Glad you cooked something and enjoyed the fruit of your labor. How does fire,smells?

[dimitrisbizakis]

Re: Heat Drops fast!

Today i tried to make pizzas, the first 2 was ok, llitle burned but ok.
After the second the floor started to cook slower than the top, the thickness of the floor is 4 cm firebrick.
...still the water from the perlcrete?
Anyway, after pizzas i baked some sourdough bread.
Now after 3 hours after the bread,the temp is still at 250c.
Questions:
I what temp should i bake bread?
Turns out little brown colour!
When do i take the temp reading for baking?
I now get the temp after the coals out, wipe the floor and let with the door on for half an hour?If it's to hot i open for 30 seconds the door and let is equalize for another 15 minutes.
...pff...i really smell like fire!

[brickie in oz]

Re: Heat Drops fast!

How do you re chard the oven floor when its getting cold?
Just waiting a while without any pizza in?
Do you add wood only at one side or both at the pizza cooking time?

Ill post a time line.

http://www.fornobravo.com/forum/f16/pizza-party-time-line-firing-19242.html#post150603

[dimitrisbizakis]

Re: Heat Drops fast!

I get my oven to at about 600c prior to a pizza night, Ive had it to 800c, clay bricks are fired to about 1200c, so clay bricks are good for ovens.
I've laid some dry pressed red clay bricks that weight 4kgs each so density shouldn't be a problem.

How do you re charge the oven floor when its getting cold?
Just waiting a while without any pizza in?
Do you add wood only at one side or both at the pizza cooking time?

[dimitrisbizakis]

Re: Heat Drops fast!

So steam something in it.....

Hahahaha...steam bath time!

[brickie in oz]

Re: Heat Drops fast!

When you say high heat, what temps do you think the oven will get, assuming that you will make good use of fuel, and in what temps pure clay is kilned?

I get my oven to at about 600c prior to a pizza night, Ive had it to 800c, clay bricks are fired to about 1200c, so clay bricks are good for ovens.

Ive laid some dry pressed red clay bricks that weight 4kgs each so density shouldnt be a problem.

[brickie in oz]

Re: Heat Drops fast!

I have a problem retaining the heat to cooking temps because of hydration.
Untill all moister is out i just look the oven as a fireplace!!!

So steam something in it.....

[dimitrisbizakis]

Re: Heat Drops fast!

excuse me dimitri you used red clay bricks for dome , is that not going to spall in high heat
I was under the impression that red clay bricks spall under high heat, I told someone this and they said no they will not can someone explain? plus he is using bricklayer's mortar, which is Portland sand lime mix could this work?

When you say high heat, what temps do you think the oven will get, assuming that you will make good use of fuel, and in what temps pure clay is kilned?
Of course the bricks are solid without holes and without concrete addition.
Here in Greece we have 130 years old oven that was built with red clay roof tiles and clay mortar or lime with sand.
After a successfully build Cob Oven(that is clay and sand) with at least 300 fires that some times reached 500 c and no spall at all, i was convinced that there will be no problem with plain red clay bricks for the dome of the oven.
Of course i have used firebricks on the hearth only because are more durable than red clay bricks.
Using bricklayers mortar is not so weird to me because concrete mortars in wood oven suffer from high heat only on the face of the mortar that looks directly to the fire.
I have used the poor man's refractory mortar 3 fine sand, 2 lime putty, 1 Portland cement and 1 clay and so far i haven seen and problem.
Keep in mind that the price of the red clay bricks is the 1/7th of the firebrick.
I have bought 0,20 a piece and the same dimensions firebricks costs 1,5 euro.
The downside is the low thermal mass, dense firebricks keeps for longer the heat but until now, without fully cured oven and two firing's in two days, the third day and after 12 hours with the coals removed and the door shut, the oven is at 150 c!
So i thing we're good!!!

[cobblerdave]

Re: Heat Drops fast!

excuse me dimitri you used red clay bricks for dome , is that not going to spall in high heat

I was under the impression that red clay bricks spall under high heat, I told someone this and they said no they will not can someone explain? plus he is using bricklayer's mortar, which is portland sand lime mix could this work?

Gudday
Good quality pressed clay commons and pavers are suitable for WFO there's a lot out there particularly in aust. If you cant find firebrick or its unaffordable they are the next choice.
With the mortar mix the Portland cement tends to fail at over 300C but serves the purpose of Holding the mix together at the start. The lime sets over time with the heat and provides the long term higher heat "glue" in the mix.
Regards dave

[dimitrisbizakis]

Re: Heat Drops fast!

Then, cook something while you're curing!

I have a problem retaining the heat to cooking temps because of hydration.
Untill all moister is out i just look the oven as a fireplace!!!

[MAVANO]

Re: Heat Drops fast!

excuse me dimitri you used red clay bricks for dome , is that not going to spall in high heat

I was under the impression that red clay bricks spall under high heat, I told someone this and they said no they will not can someone explain? plus he is using bricklayer's mortar, which is portland sand lime mix could this work?

[Laurentius]

Re: Heat Drops fast!

...damn!Curing fires are so boring...

Then, cook something while you're curing!