Hope Pompeii Oven Photos Part 2
Part 2 of Photos
Your oven looks great! Did you weld up your own funnel for the vent?
Thanks David! I had a welder make the vent for me locally.
Can I be nosey and ask how much the vent fabrication cost?
Also, what type or grade of material did you use?
Thanks Hope. Great oven -- and now you get to really enjoy it.
The Vent Fabrication Cost $60.00 and the Flue Cost $10.00. I believe it was 16 gauge steel. The ceramic insulation blanket cost 94.00 for 50 sq feet.
Why can't we use standard fiber glass insulation?
(M) Hope wrote that "The ceramic insulation blanket cost 94.00 for 50 sq feet."
(M) That seems kinda "spendy". Why couldn't we simply lay out standard fiber glass batts, or rolls on top of our ovens and then, optionally apply insulating mortar covered with stucco ?
(M) I have seen many photos where builders constructed a shell of Durock or Wonderboard (a cement board) around their "igloo". Then they poured vermiculite or a similar insulation into the box they created that houses their igloo. Isn't that a lot cheaper?
My understanding is that when tyhe whole dome gets really hot the fiberglass melts. The Kaowool can withstand up to 3200°.
You can just pour vermiculite around the oven. The logic behind the insulating blanket is that it is more efficient than vermiculite, so it does a better job of keeping heat inside the oven. It keeps the thickness of the insulation down. It is also a solid blanket, that will keep anything, such as sand or loose insulation, from ever working its way down through your brickwork and falling into the oven.
Like most things in the Pompeii design, you get to choose, we just give you the information you need to make the choice. :-)
The $53 for 50 sq ft is a good price.
We stock Insulfrax 1" at Forno Bravo. You can always get it from us, though you have to pay shipping.
If do you prefer to use the fiberglass blanket to replace some of the vermiculite layer, you simply could change the order of work, as dome refractory bricks – mortar – vermiculite – fiberglass – stucco (finishing).
The vermiculite installed after mortar, down the temperatures reaching the fiberglass.
I made this in my hearth building (fiberglass – vermiculite – mortar – sand & clay – refractory bricks) and I had not experienced any problems.
I installed several thermocouples on the hearth surface, between this and mortar and below the fiberglass. The temperature curve of this last one show no variation in the first 3 hours or so (fired and cooking pizzas time) and an elevation of around 120 °F over the next 12 hours (closed door, no fire at all).
That's REALLY interesting
Do you mean to say that the bottom of the fire brick floor stayed at room temperature for the entire cooking time, and didn't start to heat up until you closed the oven and the fire was out?
That gives us some indication of how useful thermal mass and insulation is under the oven floor, if true.
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