making fire hearth on mobile oven

[brickie in oz]

Re: making fire hearth on mobile oven

I have premix vesuveus fire cement for this and want to trowel it inside the dome,as fire hearth

It wont work, that is just a thin joint glue for sticking fire bricks together with.

[david s]

Re: making fire hearth on mobile oven

From the sounds of it you plan to cast your floor using a refractory castable over the vermicrete insulating slab. This works ok, but expect a large piece of refractory to crack. It is a good idea to at least engineer a join right down the middle so your refractory floor is in at least two pieces. You could set a few pins into the floor that will key into the base of the dome when you cast over the floor. I didn't do this for my mobile oven and the only thing that holds my one piece cast dome in position is gravity and the vermicrete insulation surrounding it. It has not led to any problems though. Assuming when you said slab of concrete that you meant refractory concrete (castable)

[brickie in oz]

Re: making fire hearth on mobile oven

You're doing it wrong. The insulation goes on top of the slab and the hearth floor on top of insulation.

What he said......
I know we are upside down on the globe but the build method is still the same way.....
Plus, why are you putting heavy concrete in a mobile oven?

[Laurentius]

Re: making fire hearth on mobile oven

You're doing it wrong. The insulation goes on top of the slab and the hearth floor on top of insulation.

[kirshner]

Re: making fire hearth on mobile oven

Hi all
how long do I have to wait for the perlite insulation to set before I can put a slab of concrete over it,I poured it yesterday and its firm to the touch, seems ready but am wondering how the trapped moisture (around perlite) is going to escape once its concreted over

[kirshner]

hi
my pizza oven is being built on a steel frame placed on a trailer,
at the base of the oven is a steel plate which has a 150 mm high steel collar welded around the edge to support insulation and concrete base.
so I,ve just set the vermaculite 100 mm deep in tray and have 50 mm of depth left in tray for hearth,what i was going to do was fill the remaining 50 mm with a refrack cement mix,then place the dome on it, i would then put the fire hearth inside dome 50 mm deep.
I have premix vesuveus fire cement for this and want to trowel it inside the dome,as fire hearth
here's my question do I have to make it stick to the concrete below with steel pins,as concerned about oven moving in transit,
second Q how do I make the outer imsulation dome attach itself to concrete base as it needs to be a fixed dome for movement as fire dome cant be fixed, but something needs to be for transport reasons.
cheers