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Renier 08-12-2010 08:45 AM

Greetings from South Africa!
Hi Guys and Girls!

I started a castable dome oven and hope that I have all my measurments right.........anyway here goes.

the dimensions of the mould as follows:

inside diameter = 900mm
Centre = 470mm high

Mouth = 450mm wide
300mm high
300mm deep

I hope this is correct as the cast has already been built.
Should have searched the net before I started but this is the dimensions I got from a friend


Renier 08-23-2010 08:43 AM

Re: Greetings from South Africa!
Here's a few picture's of the mould.
hope to get your thoughts on this!

Renier 08-23-2010 08:45 AM

Re: Greetings from South Africa!

Renier 08-23-2010 08:47 AM

Re: Greetings from South Africa!

Renier 08-23-2010 08:50 AM

Re: Greetings from South Africa!
In goes the surfboard foam and body putty to shape the dome!

Renier 08-23-2010 08:54 AM

Re: Greetings from South Africa!
Some sanding sealer and a fibreglass layer to firm things up a bit.

inside the mould the air hose to aid in the cast release.

and the air nozzel prior to sanding

Renier 08-23-2010 08:56 AM

Re: Greetings from South Africa!
will take some pic's soon
hope to hear from you guys
cheers and happy pizza's

mr g 08-23-2010 10:40 AM

Re: Greetings from South Africa!
Hi, looks realy good. Can you elaborate on the surfboard foam and the air nozzle please?

The dimensions are fine, however it doesn't look like you've allowed for a rebate for the door to rest against. The door needs to be on the oven side of the chimney. This way you can trap all the heat in when baking bread and roasts. When cooking pizzas the door is not required.

You can check out my castable oven at :
or just search for castable.

Mr G

Renier 08-24-2010 03:47 AM

Re: Greetings from South Africa!
Hi Mr. G,

I used surfboard foam to form the dome as it is light weight and can easily be sanded down to the right shape, its far lighter than sand meaning I can move the mould around.
For strength I added a few layers of fiber glass to reinforce the foam so it doesn’t crush under the weight of the refractory cement and it seals all wood leaving the water in the cement until it cures properly.

I added the air nozzle to aid in the release of the cast, so just before a pour I will cover it using a circular sticker and then add oil,clingwrap or any other necessary releasing agent, once the cement is set I will connect the hose to a compressor witch will force air in between the mould and the cement hopefully aiding in the release.
As for the rebate I did add 25mm rebate but unfortunately it’s not on the oven side.

Could I perhaps make a door with a circular plate extension to block the flue or do I need to change the mould?

Mr G I see our dimensions are exactly the same.... thats a relief as I got it from a friend who introduced me to FB, he must have read your trhead....

cool thanks
for the feedback will update with pics asap.

mr g 08-24-2010 04:02 AM

Re: Greetings from South Africa!
G'day Renier, I think your proposal will do for keeping the heat in. Although it's not ideal because what you want is to insulate any surface that is exposed to the outside environment.
If it was my oven I guess I would spend the extra time and make the rebate on the oven side.

I'm sure whatever you decide is better than not having an oven at all though !! :D

Good luck.

Mr G

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