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Because moisture always travels away from the heat source and gravity also assists in it accumulating under the floor bricks, the insulation layer, which is highly hygroscopic (unless you choose foam glass), the underfloor insulation layer has the ability to hold a very large amount of moisture (check the volume of your proposed underfloor insulation. Unless trapped moisture is given a pathway exit, complete drying can take months. Remember that one litre of water creates more than 1500 litres of steam. So in addition for this steam to escape the holes also act as pressure relief. The large amount of water added during the build needs to be teased out slowly. In addition, if weather is allowed entry to a dry oven it also accumulates in both the dome and underfloor insulation layers. Depending on climate, apart from rain, humidity also accumulates in the whole oven, even if covered by a roof. This alone can impact the oven’s performance and often a long slow fire the day before a decent cook up is a good idea if the oven has been idle for some time.
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As David mentioned, we do not see builder normally plan and research there build like this, so kudos to you. A couple comments. Both the inner and outer arch dimensions don't seem to account for the mortar gap so dimensions may need to be adjusted. On the inner arch, consider a taper inner arch to make to dome to inner arch interface more seamless. Takes work to do this arch but pays off on the back end when mating the dome to the arch. With a tapered inner arch you need to start with a full length brick so 4.5 length bricks will not work. There are many examples out there. JR Pizza did a good job on this. Here is an example of a tapered inner arch from my build. Taper Arch Example.pdf
Also, you can attached up to five pics on a post if you keep the pics below 1.25 meg (know this is small by todays standard) .Comment
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Why don't you set up a thread in "Pompeii Oven Construction" and I will move all the posts to that thread. This topic/area is the one that gets the most activity and views.Comment
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