I'm getting closer to my Dome!

[Aegis]

Re: I'm getting closer to my Dome!

It should be fine then with a liner.

I am so bad, I didn't even ask the question correctly! LOL

Thanks

John

[brickie in oz]

Re: I'm getting closer to my Dome!

Hi Al,
I forgot to mention I will be using a refactory flue pipe for the actual flue. Just surrounding it with either concrete block

It should be fine then with a liner.

[Aegis]

Re: I'm getting closer to my Dome!

Concrete Jethro, concrete.
Anyway, concrete wont stand up to the high temps of flue gases for very long and will break down.

Hi Al,
I forgot to mention I will be using a refactory flue pipe for the actual flue. Just surrounding it with either concrete block like Dmun or brick. Brick will be at the top for appearances, as that will be the only section exposed above the roof. I said I was masonry challenged to say the least!
Thanks for the responses
John

[Aegis]

Re: I'm getting closer to my Dome!

Clay bricks will be fine.

Thanks Al!

[brickie in oz]

Re: I'm getting closer to my Dome!

Clay bricks will be fine.

[Aegis]

Re: I'm getting closer to my Dome!

Concrete Jethro, concrete.
Anyway, concrete wont stand up to the high temps of flue gases for very long and will break down.

So I need to use bricks from the foamglas on up? I just need to be clear on this as I have no idea.
Thanks Al for the input
John

[brickie in oz]

Re: I'm getting closer to my Dome!

I am at the present tending towards using 4 inch. cement block

Concrete Jethro, concrete.
Anyway, concrete wont stand up to the high temps of flue gases for very long and will break down.

[Aegis]

Re: I'm getting closer to my Dome!

I haven't built my oven yet but I asked the question once and had some feedback. If you want to check out the thread I will attempt to add it. http://www.fornobravo.com/forum/f8/i...ing-16044.html

Thanks and good luck with your build, if you have any questions I will be happy to direct you to someone who could answer them! Just kidding, I will do my best from the stand point of going through the build and letting you know what I did and if it worked out or not.
Again Thanks
John

[BriggsARNP]

Re: I'm getting closer to my Dome!

I haven't built my oven yet but I asked the question once and had some feedback. If you want to check out the thread I will attempt to add it. http://www.fornobravo.com/forum/f8/i...ing-16044.html

[Aegis]

Re: I'm getting closer to my Dome!

Today I installed the first piece of refactory flue and worked on the facade a bit. Putting in a flat arch across the front opening. I am also starting to cure the oven with a couple of halogen lights inside the oven and a wooden door mostly blocking the opening. I got to try out my toy, semi-homemade thermocouple meter. Outside temp. read 77 degrees and the dome temp read 112 degrees F I haven't hooked up the other couples as of yet, so other temps around the oven are still unknown at this point.

I am still hoping someone has some words of wisdom on the chimney indecsion. In other words Help!

Thanks
John

[Aegis]

Re: I'm getting closer to my Dome!

Still trying to figure the best way to make the chimney. I have seen many designs with duravent, either left exposed or encolsed in cement board and then veneered with stone, brick etc. I have also seen short chimneys on top of an igloo build (Les's oven come to mind, great job!) But I haven't seen a tall (relatively speaking, 5 feet of added brick work) chimney built on the vent. I am VERY worried there is a good reason for this lack of construction!
I am at the present tending towards using 4 inch. cement block up until the roof line and then do a small brick chimney above the roof.
On another note: the front archway and entrance question. I have seen many decorative (may I add beautifully decorative arches) in front of the firebrick arch. I cannot make out from the pics I've seen if the decorative arch touches the hot firebrick arch. Is there an air gap between the two? If so how much? Just so that they aren't touching?
I am starting to "cure" the oven, even though I do not have the chimney figured out as of yet. I put a work light inside and let it on over night. I temporarily connected the tc meter to the dome brick tc and it read 90 degrees @ 9am out side temp was 68 degrees. So I believe the light is heating up something. Unfortunately it is going to be raining most of today so I hae the oven tarped. Not much evaportation going on today.
The work lights are two halogens with two brightness setting(read heat output) so I will use them all week until I get some time off work and can tend a fire all day.
As Always thanks for all the comments, criticisms, and most of all with your patience and help!
Thanks
John

[Aegis]

Re: I'm getting closer to my Dome!

John,

Your thermal design seems sound, but if I understand correctly, you are going to stack over 500 pounds of brick over your entry arch? Unless you have butressed it and not shown us I would hesitate to place so much weight on it. Perhaps a few firebrick columns against the sides of the arch, or some angle brackets to prevent blowout. I would hate to see all of that work collapse...
Just a thought.

gene

Hi Gene,
Of course I haven't buttressed anything! It did cross my mind that was a little too much weight for the arches. I was thinking if I had to do something like that, then the stud walls I am planning on using will give lateral support to the front arch and I will bring that back towards the rear arch and do the same. Then over the vent tie them together, I may possibly use unistrut for the "bridge" I have gone through many threads without seeing many brick chimney supports. Dmun and another which escapes me at the moment are two that I have seen.
Thanks for the reminder, I needed that!

John

[ggoose]

Re: I'm getting closer to my Dome!

John,

Your thermal design seems sound, but if I understand correctly, you are going to stack over 500 pounds of brick over your entry arch? Unless you have butressed it and not shown us I would hesitate to place so much weight on it. Perhaps a few firebrick columns against the sides of the arch, or some angle brackets to prevent blowout. I would hate to see all of that work collapse...
Just a thought.

gene

[Aegis]

Re: I'm getting closer to my Dome!

This is my planned thermal break for the chimney. Firebick, topped with foamglas then chimney brick on top of that. The chimney will be a total of five feet high from that point up.
Ok, I stacked up 97 pavers @ 6 lbs. per paver for a total load of 582 lbs. That is a five foot high chimney. The foot print of my stack is 16"*8"= 128 sq. inches. For a 4.54 psi. load The foamglas is rated for a compressive load of 90 psi I hope my calculations are correct! Please someone let me know if this is correct or I am better off stacking the brick on top of the firebrick for strength!
Thanks in Advance
John

[Aegis]

Re: I'm getting closer to my Dome!

You oven is looking great!

I was wondering how long you can wait before cleaning the mortar on the inside of the dome before it gets too hard to clean?
Once it's dry/cured, what does one use to clean the inside?

Thanks and keep the pictures coming,
Jeff

Hi Jeff,
I didn't use forms to hold the bricks in place. (except for the last ring/keystone, used a ball for that) Without forms I usually let the bricks set for 15 minutes and then used a wet sponge and wiped them clean. VERY easy to do at that point. Some runs from the watery sponge could get wiped out a little later with a damp sponge. If the mortar starts getting hard then the trowel could be used with a wiping of the sponge again. After it is hardened then the dreaded grinder, with all its dust and vibrations!
Thanks for the compliment on the oven, I tried to come close to prior builds but my stomach wouldn't let me take the extra time to do it better.