Hi I will be starting my pompeii oven soon and I will be using home brew to build. it is there a particular formula that I should use ? Also what sand do I use,Sharp sand or building sand ? While I am here,What do people recommend ? building the dome on top of the hearth or cutting the hearth to fit the dome ?
I've always built my first dome with a half...brick on edge, then laid the hearth inside of this. The outer spaces of the hearth bricks can be awkward cuts but I just use an angle grinder to cut then "near enough" then fill the outer edge with left over homebrew mix.
I found by using the 3:1:1:1 ratio sometimes the homebrew would crack slightly so now I use a 5:1:1:1 ratio of sand, normal opc cement, hydrated lime and powdered fire-clay. I also try to use coarse....but not gritty sand. In S.Wales out builders sad is "dredged sand" which always works well for me.
It depends on whether you are going to use portland cement or HAC/CAC as your hydraulic binder.
If HAC, I used 123 (1 part portland, 2 parts sand and 3 parts fine grog). If portland, no idea, but someone will be around soon to advise
I know this is very late to ask but I only saw your materials up for sale very recently but I was wondering if you were still up for selling them. In case you are please reply as I am very to buy a bit of grog and fire clay to create a crucible with those materials. How ever please notify me on the materials first. thanks.