Wear a decent mask and be cool :). It is used as an extra layer of vermiculite. Four parts soft building sand, one part Portland cement. The better the insulation, the less heat can escape, so you will get optimal energy from your fuel. I will probably repaint the exterior every 2 years or when we fancy a chance of colour (it's yellow at the moment), Start your fire at about the same time you make your dough (Jamie Oliver recipe by the way!). Since then the mining of vermiculite is thoroughly regulated. You'll also need to wear a dust mask as the dust is apparently harmful and can irritate your lungs. When in use, seal the flue to the oven using a length of ceramic stove rope. Go entertain your friends and family! It still found asbestos in vermiculite sourced from other mines although only a small percentage contained asbestos and and even smaller ( 2-3 products out of 35 tested) contained high enough levels to be a concern. Trim your house bricks with a bolster and hammer or an angle grinder to match the contour of the dome as closely as possible. They are both silicates i’ll give you that… As i have mentioned in the comments: Vermiculite was once mined from a mine which also contained asbestos. Just wear a mask if you’re worried about it. The ones you can buy still require a base to be made or bought and you have to assemble the oven as well. I used concrete paving slabs for the base instead of pouring a slab of concrete. Did you make this project? Light another gentle curing fire whilst you're at it - not too hot please but bigger than the last fire! Ok - thanks for clarifying - that makes a lot more sense! Go ahead and plaster the front and sides of the base whilst you are at it. I have no bricklaying experience and it wasn't to difficult - just use a spirit level all the time to check that it is all straight. These ovens can be constructed fairly easily at home with exfoliated vermiculite and other refractory materials such as fire bricks. The jig is basically a crude table with a 700mm circle cut out of the middle. For my base of 0.9m, I cleared an area of 1.2m square. Whilst my door was drying I couldn't resist and fired the oven up using the arch mould as a door. Wrap your flue pipe with a layer of cardboard. First Prize in the Stone Concrete and Cement Contest. I incorporated an unused kitchen door handle into my oven door which gets a bit warm but does the job. The Design. Once dry (not cured yet) you can slip the cardboard covered flue template and you will find that you have created a nice socket for taking your flue down when the oven is not in use. For these properties, it has been used as insulating material widely. I used a staplegun with long 30mm staples. NICE! At first, dry ingredients are mixed properly and then water is add in small amount and mixed properly by hand or shovel. I hope you enjoy making your own wood fired pizza oven! Once again, place the dome on top and trace the edge to make your cut line. It is an effective insulator than others. I added an extra brick on the top of the arch as a design feature / somewhere to put a glass of wine :). Vermiculite mining is now regulated and the product tested. Some houses built in the US during that era were insulated with this specific vermiculite from that specific mine. Vermiculite, Gym Ball Dome, Wood Fired Pizza Oven. A vermiculite pizza oven is one that is made from a concrete composed of the coarsely ground, highly insulatory mineral, vermiculite, and a refractory cement suitable to withstand high temperatures. Vermiculite is one type of hydrous silicate mineral, which is classified as phyllosilicate. Thus contaminated vermiculite cause health problem. It results more efficient insulation for pizza oven. Place the dome on top of the calcium silicate board and outline the shape onto the board with a pencil. Bond the dome to the base with either left over fire cement or a quantity of vermiculite cement mortar using the same recipe as for the dome itself. When you are about to cook a pizza, throw the warmed log onto the embers and it will burst into flames! Hi Phammy57, Great instructable! I used a slightly weaker mortar mix of 4:1 for the brick laying. Then you have to apply that mixer on the dome outside with a layer thickness of one inch. Fire bricks: Test arrange your 25mm firebricks on top of the silicate board. At first, these two dry materials are mixed properly and then it is mixed with water as ratio of 6:1 (dry matter: water). It may be solid in touch but stays soft. How do you staple the blank down? 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2020 vermiculite pizza oven