Measuring your Hearth

[Neil2]

Re: Measuring your Hearth

"no more that 60% of the dome height"

The "magic number" is 63%. No more, no less.

[eatingmorefood]

Re: Measuring your Hearth

Ok,
Now I need to know how to get the thread started !
thank you,
EatingMoreFood

[eatingmorefood]

Re: Measuring your Hearth

Hi all,
Here is the slab with concrete blocks, lots of rebar and crushed stone topped with 5 in concrete hearth to date. I added 20% extra crushed rock and sand to the mix. All wood and rebar was recycled, donated by local construction sites. The HD tie down strap really helped keep frame together nicely.
Left the heavy strap on for 1 week now. I am told concrete dries and hardens over several months. Any thoughts?
Still figuring out the picture upload. These are all in my album.
EatingMoreFood

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http://www.fornobravo.com/forum/memb...ish-drying.jpg

[eatingmorefood]

Re: Measuring your Hearth

Ok,
I will try this !
thank you,
EatingMoreFood

this is a test....

http://www.fornobravo.com/forum/memb...0-dig-hole.jpg

[dmun]

Re: Measuring your Hearth

If the picture is uploaded, and you can find it, you can left click on the image, select "copy image location", then in your post you can hit the postcard icon over the box where you type. This brings up a dialog box where you can paste the location (or URL) of your picture, and it will show up right in your post,



Like this.

[eatingmorefood]

Re: Measuring your Hearth

How do I get my photos to appear in a post. I uploaded build to my album but no idea how to get the thread in the right place. Help !
EatingMoreFood

[Spunkoid]

Re: Measuring your Hearth

By chance do you have any pictures of your oven under construction, specifically the door...?
I will be using refractory mortar and have built a 4" insulating slab on top of the hearth. Once the oven dome is done, I am planning of framing around it and will fill that space with perilite or vermiculite.
Glad to hear you are cooking... my pizzas are still being done in my BBQ on a big flat stone on the grill.

[mulga]

Re: Measuring your Hearth

I am about to put on the final waterproof render. When everyone says you need lots of thermal insulation, they are right, you cannot have enough. If possible use refractory motar, I didn't and wish I did now.
After I finshed the brickwork, the dome stayed intact, I did a waterproof render, but I lost lots of heat. So then I did a 50mm perlite and aluminium cement render, a 25mm (1'') superwool blanket and then a 50mm vermiculite render and are about to finish it off. The pizzas had better tast good.....
Good luck mate, let us know how it works out.....

[Spunkoid]

Re: Measuring your Hearth

Hi Mugla,

Did you get any responses? I am building a 1 meter interior oven as well and your door height and width are about what I have been planning as well. How far along are you?

Rick

[mulga]

Re: Measuring your Hearth

I am new to all of this and have just laid the first course for a 1 metre internal floor oven. I have picked up bits and pieces of info from you guys on-line. I am doing the door 12'' high by 20'' wide with an internal dome height to be about 20'', does that sound about right.I understand the door heigth is to be no more that 60% of the dome height otherwise the fire won't draw properly. I have laid the 1st course bricks normal side down and then laying half bricks on top, it that correct? One of the things that worries me is the construction of the chimney (the oven is outside). Any help would be most appreciated. cheers... Mulga

[Balty Knowles]

Re: Measuring your Hearth

I can only speak from my own one time experience. I had 2 layers of Insulfrax on the sides but compressed into 3" of space & an extra layer on top as I had it left over. Absolutely no heat transfer through the walls or roof.

Rgds

Balty

[beth halstrom]

Re: Measuring your Hearth

I'm installing a Premio 100 (39" cooking floor) and am trying to get an exact stand measurement. If I'm using 2 FB blankets for insulation (omitting the vermiculite) would I need to add 10" for insulation using the chart above? Walled enclosure, not igloo style. The smaller the footprint the better.

[Xabia Jim]

Re: Measuring your Hearth

PhotoPlog - Error

my oven is a meter or about 39 or 40 inches and have stacked oven dishes on top of each other before....terraced cooking I called it.

Is there a post on relative surface area any where?

[Balty Knowles]

Re: Measuring your Hearth

I was worried about heat transfer to my outer brickwork as I only had 3" of space around the bottom of the dome. I used 1 blanket of insulfrax around the sides & then tamped down any off cuts to fill the gap. I added a second blanket where I could & then filled the cavity with Vermiculite.

After several hours of the oven at temperature there is absolutely no heat transfer to the outside of the brickwork.

I added another blanket on top because I poured a concrete slab as my roof & was worried about heat transfer from the top. Again there is none after several hours of using the oven.

[RCLake]

Re: Measuring your Hearth

Hi,

New to all this but building the oven this week. Can I double the insulationg blanket and cut back on the thickness of the vermiculite shell?

Stongly suggest you do just that. Since I could find both products in Dallas, I found out cost wise it was a push and I think the blanket is better. I've built a 42" Tuscan and 50 sf of blanket will provide half again the thickness. It takes about 2/3rds of a box to cover the WFO, I bought a box of 2" and 1" thinking I would get 3" coverage. I'll almost have 4-5" over it when I'm done.