Pizza oven, insulation and mixture proportions

Hello everyone! I want to make a medium size brick pizza oven, i can't find perlite or vermiculite, because i live in venezuela, but i know where to get fiber glass wool  insulation for a goop price. I don't know how to make the base of the dome, should i do it like (from bottom to the top): 1.concrete,  2.fiber glass, 3.bricks?

Also, i can only get cement and maybe pottery clay, could you help me with the proportions of the mixture (including water) for the binding of the bricks? And also the proportions for the mixture that goes on top of the insulation of the dome (outside part).

i have sand and i can cosider using cob.

Anothe question, can i bind the bricks only with regular concrete?

P.s: where i live i can't get refractory cement

Luis, I suggest you visit the Forno Bravo forum.  It is the gold standard for building brick ovens.  There are plans on the site for building the base out of cinder blocks.  They are not very big on natural building methods such as cob, but there are a decent number of cob builds in the forum.  I know you are using brick though, which is why I recommend you read that site.  I don't want you to do all that effort and have your oven crack or collapse and you be disappointed.  Masonry is quite heavy.

Also no, I do not think concrete is going to be sufficient.

Good reading and good luck!

Rob Lineberger wrote:Luis, I suggest you visit the Forno Bravo forum.  It is the gold standard for building brick ovens.  There are plans on the site for building the base out of cinder blocks.  They are not very big on natural building methods such as cob, but there are a decent number of cob builds in the forum.  I know you are using brick though, which is why I recommend you read that site.  I don't want you to do all that effort and have your oven crack or collapse and you be disappointed.  Masonry is quite heavy.

Also no, I do not think concrete is going to be sufficient.

Good reading and good luck!

Thank you i will check it out!

Rob Lineberger wrote:There are plans on the site for building the base out of cinder blocks.

Cinder blocks wouldn't crack? My doubts are about the flat part of the dome, where you put the pizzas, my english is not that good i don't know if maybe you didn't understand me haha, or maybe you are saying that i should build the inner flat part of the dome like: 1.cinder block (down) 2.fiber glass (middle) 3.bricks (top)

My original plans where to put the brick dome on top of a cinder block structure (the cinder blocks not getting any of the heat)

What I mean about a cinder block base is this:



That image comes from the Forno Bravo oven plans.  It's a good read.  

The layers, from top to bottom:

exterior stucco
insulation
thermal mass (brick, cob)
oven air space (where the pizza goes)
fire brick base (under the pizza)
Insulation base (wine bottles in cob, or cement fireboard)
steel sheet where all of that ^^^ rests
cinder block stand
foundation
ground

Here is an example of a test oven I made. It's not a perfect match for yours but I hope it gets the idea across: