Forno Bravo Forum: The Wood-Fired Oven Community

Forno Bravo Forum: The Wood-Fired Oven Community (http://www.fornobravo.com/forum/)
-   Getting Started (http://www.fornobravo.com/forum/f6/)
-   -   Dome height vs Stability (http://www.fornobravo.com/forum/f6/dome-height-vs-stability-19805.html)

fourlambs 08-17-2013 10:05 PM

Dome height vs Stability
 
Hello all,
I have just completed my 'soldier course' on top of my base and now need info on dome height (I have browsed for info but am confused...:confused:), I also understand that a dome too low can have an impact on structural stability...?

The facts;
My internal floor diameter is 97cm.
The angle cut on top of the soldier course is 20 degrees
The door internal height when complete will be 31cm, internal width 64cm


So how high does the dome need to be?

The oven will cook mainly pizza and breads....

I have link to images, you will see my approach may be a little different but this is due to circumstances.....

Library Slideshow by Fourlambs | Photobucket

All advice appreciated, thanks Phil

brickie in oz 08-17-2013 10:37 PM

Re: Dome height vs Stability
 
Welcome Phil.

My biggest concern is that it looks like you have no under hearth insulation?
Is that right? :confused:

You also have concrete piled up underneath the soldiers, you will need a forest of fire wood and heaps of time to get the thing hot. :eek:

Laurentius 08-17-2013 10:54 PM

Re: Dome height vs Stability
 
Hi Four,

Before you sacrifice the lambs, tear that baby down. Don't hesitate, insulate. Al is right, and you are at the ideal stage to correct your wrong.

david s 08-17-2013 11:06 PM

Re: Dome height vs Stability
 
Quote:

Originally Posted by fourlambs (Post 159694)
Hello all,
I have just completed my 'soldier course' on top of my base and now need info on dome height (I have browsed for info but am confused...:confused:), I also understand that a dome too low can have an impact on structural stability...?

The facts;
My internal floor diameter is 97cm.
The angle cut on top of the soldier course is 20 degrees
The door internal height when complete will be 31cm, internal width 64cm


So how high does the dome need to be?

The oven will cook mainly pizza and breads....

I have link to images, you will see my approach may be a little different but this is due to circumstances.....

Library Slideshow by Fourlambs | Photobucket

All advice appreciated, thanks Phil

A hemispherical dome for your oven would have a height of 48.5 cm. 63% of this gives you 30.55cm If you want a low dome height then your door should be 63% or thereabouts of the internal dome height.

fourlambs 08-18-2013 12:05 AM

Re: Dome height vs Stability
 
Thanks all,

.... but I can confirm that there is full square meter of calcium silicate under those tiles and a good solid concrete foundation, around 20cm thick, under that.

Does this satisfy the doubters:rolleyes:???


David S, 48cm is roughly where I was thinking, so thanks for the confirmation.

Phil
Dandenong Ranges

brickie in oz 08-18-2013 12:12 AM

Re: Dome height vs Stability
 
Quote:

Originally Posted by fourlambs (Post 159701)

Does this satisfy the doubters:rolleyes:???


Not doubters, there has been sooo many builds on here where the builder has omitted the insulation, then the cant work out why the oven wont get hot?

We are here to offer help, sometimes its just too late for it. :(

mrchipster 08-18-2013 04:11 PM

Re: Dome height vs Stability
 
Quote:

Originally Posted by fourlambs (Post 159701)
Thanks all,

.... but I can confirm that there is full square meter of calcium silicate under those tiles and a good solid concrete foundation, around 20cm thick, under that.

Does this satisfy the doubters:rolleyes:???


David S, 48cm is roughly where I was thinking, so thanks for the confirmation.

Phil
Dandenong Ranges

It sure looks to me like the ceramic board is only under your floor tiles and not under the soldiers. Heat will wick out of the walls also and cause the oven to not heat properly

fourlambs 09-03-2013 08:08 PM

Re: Dome height vs Stability
 
Ok, after much toiling and learning along the way, the dome is complete. I am rather proud of how the top ended up, as I was worried there for a while!

image_zps43785169.jpg Photo by Fourlambs | Photobucket

I am now contemplating the finish and I am considering the perlite / mortar mix over the blanket, but also wondering what other finishes I could use? Also, at what point does this become water tight?

Cheers
Phil

Greenman 09-03-2013 08:47 PM

Re: Dome height vs Stability
 
Hey Phil - It is good when the keystone goes in and it starts to look like the real deal. I put 2 layers of blanket followed by 2"of vermicrete and render over the top of that. I finished the whole deal with Dulux AcraTex to seal it.

It isn't really waterproof until the acrylic sealer (or whatever you chose to use) goes on as the render will still absorb moisture.
It also pays to have a vent to allow any moisture trapped in the layers to escape when you fire it up. Mine is a poly fitting with a capped thread and the little chinaman hat on top is just my idea of decoration.

Plenty to do before the smell of cooked food comes out of the dome but you are well on the way. Congratulations.


All times are GMT -7. The time now is 04:05 AM.

Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.6.0
2006/10 Forno Bravo, LLC