Pizza oven

[Capt Chaos]

Hello all,
Ive just given my oven 150mm insulation layer.
50mm ceramic blanket and about 100mm perlite/cement layer.

The fire bricks on the floor have small gaps between and are not 'perfectly' smooth.

what can one do to fill the gaps successfully that will take the heat?

thanks

cc

[Fluffy]

Hello all,
Ive just given my oven 150mm insulation layer.
50mm ceramic blanket and about 100mm perlite/cement layer.

The fire bricks on the floor have small gaps between and are not 'perfectly' smooth.

what can one do to fill the gaps successfully that will take the heat?

thanks

cc

Nice - What about a bed of steel.

Please tell me about the perlite/cement mix. I am making a Hibachi braai and doing the same mix. Which cement did you use. I see some people use some "white" cement.

[LC Bakkie]

Capt some phodies please. Also about to do a pizza oven. Bought the shell and once in place I need to do the insulating layer.
What ratio did you do your mix.

[MikevR]

Hello all,
Ive just given my oven 150mm insulation layer.
50mm ceramic blanket and about 100mm perlite/cement layer.

The fire bricks on the floor have small gaps between and are not 'perfectly' smooth.

what can one do to fill the gaps successfully that will take the heat?

thanks

cc

The floor smoothness is very important to be able to slide over it. I opted for 6mm tiles as opposed to firebricks. Ceramic tiles are cured at a higher temperature than you can get in your oven. Se pic ......
I have al;so been looking at Perlite and Cement. I think the 46,5 is ok. I also think a final layer of clay a nd cement improves insulation.

[MikevR]

The floor smoothness is very important to be able to slide over it. I opted for 6mm tiles as opposed to firebricks. Ceramic tiles are cured at a higher temperature than you can get in your oven. Se pic ......
I have also been looking at Perlite and Cement. I think the 46,5 is ok. I also think a final layer of clay a nd cement improves insulation.

Re orientated picture will be corrected.

[MikevR]

Re orientated picture correction - Ceramic floor

[jelo]

@ MikevR: tell us about the galvanised steel?

[MikevR]

@ MikevR: tell us about the galvanised steel?

I was experimenting with reflective surfaces and a retain of the floor concrete ring before the insulation, You will notice there is a air input pipe as well this has a valve on the outside - the unit I built is multi purpose and a hobby experiment. It functions as a Roaster - rotisseries (with Weber Rotiserie ring) and / or smoker and if I place a plough disc type wok skottle braai upside down it becomes a pizza oven. The skottle is place about 2/3rd down the drum see picture of deflector plate position. I also keep the Skottle braai separate for fry ups and breakfasts. I have added the overall picture again of the whole unit. My next project is to change my fire pit design for my flame braai. I will do a separate thread on that.

Enjoy

[jelo]

I was experimenting with reflective surfaces and a retain of the floor concrete ring before the insulation, You will notice there is a air input pipe as well this has a valve on the outside - the unit I built is multi purpose and a hobby experiment. It functions as a Roaster - rotisseries (with Weber Rotiserie ring) and / or smoker and if I place a plough disc type wok skottle braai upside down it becomes a pizza oven. The skottle is place about 2/3rd down the drum see picture of deflector plate position. I also keep the Skottle braai separate for fry ups and breakfasts. I have added the overall picture again of the whole unit. My next project is to change my fire pit design for my flame braai. I will do a separate thread on that.

Enjoy

Aha thanks, I recall that system now.

[Capt Chaos]

I got the perlite from the Pratley factory , west of JHB.
i bag perlite 1 bag cement.
I just used the Builders stuff. - to be honest didnt think of different as wife is arty and gonna clad it in mosaic/bits of tiles.

I made the mistake of buying a Hamilton oven [ charges like a raging buffalo] as they're only 45mm thick.
consequently doesn't retain the heat.
I've now done it correctly and after a hot 1 hour fire, there is not a bit of felt heat outside,

[Fluffy]

I got the perlite from the Pratley factory , west of JHB.
i bag perlite 1 bag cement.
I just used the Builders stuff. - to be honest didnt think of different as wife is arty and gonna clad it in mosaic/bits of tiles.

I made the mistake of buying a Hamilton oven [ charges like a raging buffalo] as they're only 45mm thick.
consequently doesn't retain the heat.
I've now done it correctly and after a hot 1 hour fire, there is not a bit of felt heat outside,

Ah so normal cement. Thanks.

[jelo]

You can also mix 50/50 vermiculite and portland 32.5 MPA.

[Fluffy]

You can also mix 50/50 vermiculite and portland 32.5 MPA.

Thanks, it seems that the choice between vermiculite and perlite hinges on the finish. I am looking for something that is aseptically pleasing as it will sit on a dining table.

So for a table top hibatchi it looks like perlite and some form of white cement. White cement being the ...gar in the wood pile. I have seen refereance to using Plaster of Paris, and other products like Polyfilla and other gysum type fillers.

[jelo]

Thanks, it seems that the choice between vermiculite and perlite hinges on the finish. I am looking for something that is aseptically pleasing as it will sit on a dining table.

So for a table top hibatchi it looks like perlite and some form of white cement. White cement being the ...gar in the wood pile. I have seen refereance to using Plaster of Paris, and other products like Polyfilla and other gysum type fillers.

Yes, I've seen plaster of paris mentioned as well. I don't think that even needs perlite?

[MikevR]

One can also mix White Wash powder into your cement and perlite if you are worried about colour. It also smoots off very nicely. Also one can use tile adhesive but a bit expensive.

[Capt Chaos]

Fluffy,

The perlite and cement mix is much whiter than i expected.
I thought it would be cement-grey, but it is much whiter

[Estee]

@ MikevR: tell us about the galvanised steel?

Mike, please tell me you degalvanised the steel or at the very least, it wont be used in the chamber where food will be

[SAND]

Pratliperl...

[Dirkba]

Do perlite pizza ovens work?



This method of pizza oven insulation has been used for thousands of years, so it is tried and true; Both vermiculite and perlite will withstand high temperatures, insulate well, and expand with heat so it doesn't crack easily.

https://www.fornobravo.com/pizza-oven-insulation/

[MikevR]

Mike, please tell me you degalvanised the steel or at the very least, it wont be used in the chamber where food will be

Hi Sean
Thank you for the query, It appears I am going to have to paint the inner surfaces of the drum with 1 part hydrochloric acid to 3 parts water. Remove all traces of Galvanised surfaces. Thereafter complete wash down and apply a coat of cooking oil. then refire without food. I will ensure there are no zinc related surfaces in the chamber at all. I hope this is a learning for others as well. Zinc is poisonous and is released from galvanized surfaces when heated.