Newbie question about oven floor

[deejayoh]

Re: Newbie question about oven floor

The base will suck the heat out of the oven - and the bigger the base you have, the worse the problem will be. You want to direct all the heat from the fire into heating your firebrick. Without insulation, the heat gets dissipated into the slab, and you'll never be able to maintain a hot enough floor for cooking.

As others have said, get some insulation in there before you go any further.

[Puckncrazy1]

Re: Newbie question about oven floor

so... this is an unconventional oven... the oven will be sitting on a 4' solid cube of concrete plus the 6-8" slab it is sitting on. I had free concrete blocks so the whole base is concrete filled concrete blocks.
My guy thinks that the two layers of firebrick sitting on that massive chunk of concrete will maintain heat and thinks that insulation under the firebrick is for ovens that don't have this solid base like we have.
Thoughts?

[Faith In Virginia]

Re: Newbie question about oven floor

They make an insulation fire brick. Insulation brick can work fine. If it is the regular fire brick that is for the floor and dome. Stop him now and get some insulation under there.

[Tscarborough]

Re: Newbie question about oven floor

Remove the firebrick and put the insulation in.

[Laurentius]

Re: Newbie question about oven floor

You're paying him? Have him to build it right! Once its finish it too late too costly. Provide him with details of your insulated concrete mixture, the info is on the forum. You should check each phase of the build, these guy are experts but not in the field of WFO. You don't want to end up with a White Elephant.

[Puckncrazy1]

I'm having an oven built for me and told the contractor that we need at least a 4" base of insulated concrete to set the firebricks on for the oven floor. That was not done, instead I have 2 layers of firebrick on a massive base of concrete filled, concrete block.
Will this design work? Will this oven ever get hot enough to use and will it maintain heat?

Thanks
Jay