Finally getting started with my own build (or at least the detailed planning) of a cast pizza oven. I have been dreaming about this for years.
Here is a summary of what I am planning to do and I would very much appreciate any feedback anybody has.
I am thinking of a 32" / 800mm interior diameter, since I don’t have too much space (especially depth wise)
Location:
I will most likely not start this build for a month or two, will wait for colder weather to make sure the dome does not cure too fast.
Here is a summary of what I am planning to do and I would very much appreciate any feedback anybody has.
I am thinking of a 32" / 800mm interior diameter, since I don’t have too much space (especially depth wise)
Location:
- I already have an outdoor kitchen and am planning to include the pizza oven into the outdoor kitchen. I have attached a photo of the location. As you can see the kitchen is U-shaped. Ideally the pizza oven would go into the slope. I am thinking of placing it at an angle into the corner to give me more distance to the BBQ. Alternatively I could place it straight on. Two sketches are attached. Any thoughts?
- Question: How much space do I need in front of the oven opening to easily maneuver with all the tools? Or in other words, how long a handle do you normally use on the tools. I am a bit concerned that I don’t have enough space to the BBQ
- I will have to dig out a bit from the slope (it will be above the current hip high retaining wall), place a foundation and pour the slab there. This means that I can’t have any weep holes as I have seen recommended, since the slab will be directly on the soil. We live in LA, so it doesn’t rain too much, I figure that should be OK, especially if I use FoamGlass for insulation.
- Since the slab is right on the dirt I am considering using
- 2” of FoamGlass (does not absorb water, and should help with keeping the floor dry)
- Maybe make the Foamglass larger than the CalSil board so that the insulating blanket does not sit on the concrete slab
- Question: I have seen people using mosaic tiles on top of the slab to insulate the Vermicrete from the possibly damp slab and help water / moisture finding its way to the weep holes. I am not planning on using mosaic tiles, since don’t have weep holes or Vermicrete. Any thoughts?
- 2” of Cal Sil Board
- Fire bricks
- Question: I have seen different types of firebrick, light duty, heavy duty. Any preference, what should I look for when selecting firebrick?
- 2” of FoamGlass (does not absorb water, and should help with keeping the floor dry)
- I am planning leaving a 1/8” gap between the oven floor and the floor of the gallery and fill it most of the way with 5:1 Vermicrete (probably sift out the larger pieces), the rest will be filled with ash.
- I will cast the dome with Homebrew 3:1:1:1
- Sand: max 3mm grain size, considering using pool filter sand
- Hydrated Lime: planning on using Type S hydrated lime
- Portland Cement: whatever is available at Lowes, Home Depot, etc.
- Clay: planning on using any powdered clay I can find. Thompson Building Materials has some
- 2” thick
- Cast dome on top of the fire bricks. It will make it easier to cut the bricks (don’t have to be as exact). I know I won’t be able to remove the bricks around the sides, but from what I have read that is not really an issue.
- Planning on casting the flue gallery separately, making sure that there is some extra space around the chimney pipe
- Attach the flue gallery with 5:1 Vermicrete (probably sift out the larger pieces)
- Question: would it be better to use high temp mortar made for fireplaces? I think the whole point is to allow for expansion of the dome separately from the gallery. If I decide to just use ceramic blanket for insulation (see below) I may not have Vermiculite. I was having some trouble finding it.
- I will insulate with two layers of 1” 8# ceramic fiber blanket (2” total).
- Don’t use chicken wire to tie down the insulation, should not be necessary, Vermicrete will keep insulation in place
- Add 2” of Vermicrete 10:1 mix
- Question: Would it make sense to just use 4” of fiber blanket and not use any Vermicrete? If my calculations are right, I should be able to get almost 4” out of 50 sqft of blanket that come in one roll. Dome and Gallery surface total area is 14 sqft total (without subtracting the opening of the dome where the gallery connects). I am having a hard time finding vermiculite in LA (all the horse supply stores and several nurseries I called were sold out and don’t know when they will get it back)
- Use a breather vent (hydraulics breather cap) screwed into a ½” brass pipe with holes at the top of the dome. I have seen other methods of using the chimney area to vent, but it may be a bit too complicated for me.
- I am planning on using stucco to finish the oven. I won’t be able to build a roof over it. It will be too massive where the oven is placed. I am planning to simply cover it with a tarp (or maybe a homemade cover cut to shape) during the winter (when there is at least a chance of rain) or when it is not in use
- Question: Any suggestion for what stucco to use? I am currently planning on using an acrylic stucco with some AR Fiberglass fibers (12 x 0.5mm), I am planning on a ½ to ¾ in thick layer. I am not planning on painting it
I will most likely not start this build for a month or two, will wait for colder weather to make sure the dome does not cure too fast.
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