Or at least you should. We didn't, we eyeballed it. What can I say? We wanted to make this happen. I'm happy with the oven so don't stress too much but just keep the level-ness of the floor in mind while you work. The answer is to soak a bunch of sand with a hose and form the interior of the oven to be dug out later. To ensure we met the planned height, we cut a nearby stick to size and formed the sand around it.
The width and height should be as planned, the rest should be essentially bell shaped. If you remember from "the plan", we intended to cover this with wet newspaper prior to putting on the thermal layer.
We forgot to buy a newspaper. It didn't matter this is why I didn't put newspaper on the materials list. No worries. The oven's thermal layer holds the heat from your fire long after it is gone so that you can cook delicious pizza among other things.
For the thermal layer, we needed 1 part clay, 3 parts sand, and enough water to make it easy to form but not so much that it was wet. The test for the right consistency was forming a golf ball sized bit of it and dropping it from wait height without seeing cracks too dry or it splatting too wet.
The mixture may change based on the clay you obtain. Experiment by digging up the clay, putting some shovelfuls on a tarp, throwing some sand and water on it and dancing all over with your feet if you want it slightly less dirty, fold the tarp in half over the mix and dance on the tarp.
Think grape smashing. Once you pass that golf ball test, get to layering. Our thermal layer was about 3" thick. We essentially formed mud bricks and smashed them together, then compressed with a board shown in image. Now your oven needs time to think about things.
We gave our Jabba the hut a week to dry out a little may need a loose tarp if you are building in a wet environment. Be sure to stick to your planned measurements as best you can! The door height:interior dome height is important so air can be drawn in for the fire to get hot. The insulation layer makes the oven cool slooooowly so you can cook stuff. The insulation layer is just clay and straw, with enough water so that it all sticks together.
We found forming little handsized bricks and building up to be useful. This layer should be about " thick and ends up looking a little ridiculous.
You can also see that it was about this point in construction when we finally dug out the sand from the interior. We waited because, as we added layers, we were compressing and didn't want to compress our way into a pile of mud. The second photo shows the sand out of the oven and the doorway edges with smoothed out by hand with a little assistance from some water. Our oven was a bit We poked little fingertip bumps in it because we were unsure if we wanted to do a plaster layer after it dried and wanted the plaster to have something to hold onto just in case.
We waited three weeks before returning to the oven. If necessary, you can build a series of small fires over time to assist in drying it out faster. As we built the oven on vacation land quite a distance from our home, that wasn't the preferred method for us. Instead, we covered the oven loosely with a tarp to protect it from the elements and let time go to work on the drying.
When we came back to the oven, we removed the tarp and heated it up using small kindling and fallen tree limbs that had dried out honestly, the smaller bits worked better in drawing in air than the larger kindling. Once enough time had passed and the oven was hot to the touch on the outside , we swept out the embers and got to cooking. I recommend using an infrared thermometer to judge temperature as we went through a bit of trial and error pizza cooked slowly at first so we went back to the fire for about 20 minutes, then pizzas cooked in about 3 minutes apiece.
You can see that we swept out much of the embers but also moved some to the sides in the last image. The front image of the oven shows what it looked like after we obtained two 5 gallon buckets of lime plaster and coated it.
We wanted slightly more protection than a tarp without having to build a roof for the oven and this met our needs. We didn't make the plaster ourselves, merely obtained it and smashed it all over the oven. Looks pretty, right? We anticipate the oven to maintain functionality for anywhere from years, perhaps longer with care. We plan on taking the lessons from this oven to build Mark 2, which will be dug into the earth for more stability. Great description and instructions!
We built one too using Kiko Denzer's book. The hardest part for me was the base, as I used broken up concrete pieces that I salvaged, and I needed a lot of them--my base is huge so I don't have to bend down to add wood or put in a pizza. Question 4 weeks ago on Step 6. I actually raised there for a bit because I had no where to go and chicory this solid layer of gray clay, is there any difference in using that vs red clay?
Pleaase reply. I am planning to make these earthen oven. But i do have regular soil in my backyard. Will it work with it? Or does it have to be clay? Or can we use cement instead of mud or clay??
Question 2 years ago on Step Answer 10 months ago. The larger the oven, the thicker the clay and insulation layers, the longer it will stay hot. My oven had about inches of clay and inches of thermal layer. It would take about 3 hours to get it fully hot. It would slowly loose heat over 4 hours, but still be slightly warm the next day. Im building one in July, your instruction is awesome. What precautions should i use for covering it in winter in Toronto, Ontario.
Reply 10 months ago. I built an oven in Seattle, Washington. I built a metal roof to cover it. I tried using a tarp to cover it, but I found that moisture still got caught in there. I built my oven. Made the insulation layer with Kiko suggestion of large wood shavings and clay. Did not put final layer on it yet which will be a lime plaster. Have fired it up a couple of times and made pizza and bread.
I stopped using it because the opening of the oven at the arch has started to burn and desinagrate. The benign has continued toward the top. It seems the insulation is burning. I did a repair with straw, clay and some sand but it continue to burn. Has this happened to anyone else? Maintain a well-defined edge. To use the oven, build a fire in it and let the smoke come out of the door opening.
Forming the oven step 4, make a door. There are many things to know about this. A very good additional experiment is to fire your test ball as hot as you can, either in a wood-stove, an oven, or a campfire.
Building venzer will appeal to bakers, builders, and beginners of all kinds, from:. Pack a hard HALL 50 to patsand drop it from chest height. He is a sculptor and builder who has been working with cob and earthen materials for 8 years. The bricks will be held in place by the heavy, solid oven walls. However, I like a clay-rich mix, as I think the clay is more durable in repeated firing. Then follow sections on chimneys and dampers, casting a chimney, and doors and doorways.
You may also like It yoru makes delicious roast meats, cakes, pies, pizzas, and other creations. To start, prepare a base for the oven. He serves as artist-in-residence in schools in his home state of Oregon, and has muddied tens of thousands of hands with his popular oven and bread manual, Build Your Own Earth Oven as well as his guide to mud-based art forms, Dig Your Hands in the Dirt El blog de alcion.
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