42" Build Hobart

[tracytracey]

I Have had my stand built for quite a while now and and am finally about to tackle the dome. I think I have the details worked out in my head but can't quite work out how much of the front of the dome I need to set back to allow for the door reveal. My opening will be about 230mm high so do I need to set back this didtance, and if so is it from the outside or inside of the dome bricks?

I will put up some pics later.

Cheers
James

[tracytracey]

Re: 42" Build Hobart

As promised here a few photos of the build so far.
I hope they turn out OK.

Cheers
James

[nissanneill]

Re: 42" Build Hobart

Hi tracytracey
the best way to establish your step back dimension is to find a suitable vacant space and lay out your dome soldier bricks (first course only) and your chimney and door revel. This will certainly show you everything that you will need to know and only takes a short time.

[Greenman]

Re: 42" Build Hobart

Hi tracytracey
the best way to establish your step back dimension is to find a suitable vacant space and lay out your dome soldier bricks (first course only) and your chimney and door revel. This will certainly show you everything that you will need to know and only takes a short time.

And since you have the base you can draw it out on the base. It is easy to establish where the centre point of your oven will be and if you add the internal dimension and the subsequent layers of insulation and render you can position it to maximise the area you have in front of the entry. That is presuming that you are making an 'igloo' style oven.

What you have looks good. All the best with your build.

[oblertone]

Re: 42" Build Hobart

Paper calculations are all very well, but there is no substitute for actually seeing what will fit in your space, and being able to adjust it accordingly; a simple dry layout of the soldier (base) course allows you to do this.

[Akamicko]

Re: 42" Build Hobart

As nissanneill, Greenman and oblertone said +1

When you have established your base and dome dimentions, you may want to consider the simple dome gauge method I used during my dome construction...

http://www.fornobravo.com/forum/f28/...ive-20917.html

Good luck with your build !!

Micko

[tracytracey]

Re: 42" Build Hobart

Thanks for all of the replies. I think I have it sorted in my head now.

I have now cut both my insulation bricks and the floor tiles now and also the first brick on each side for the entry.

I was planning on laying the first course today but it has been raining all day on and off, might get a chance if it stops later.

[nissanneill]

Re: 42" Build Hobart

tracytracey
I think that you have made a serious mistake here. You have not left enough room in front of your oven entrance for the smoke/chimney void! Remember that your oven entrance will be somewhere around 4 brick courses high and then each successive row will run the full 360˚ around your oven perimeter. There needs to be more room for the smoke and hot gasses to be directed up your chimney or else they will come out the front, spoiling the appearance and making it uncomfortable and dangerous to reach in and use the oven. Add another half brick between your oven entrance and your front arch. You won't regret it.

Neill

[david s]

Re: 42" Build Hobart

tracytracey
I think that you have made a serious mistake here. You have not left enough room in front of your oven entrance for the smoke/chimney void! Remember that your oven entrance will be somewhere around 4 brick courses high and then each successive row will run the full 360˚ around your oven perimeter. There needs to be more room for the smoke and hot gasses to be directed up your chimney or else they will come out the front, spoiling the appearance and making it uncomfortable and dangerous to reach in and use the oven. Add another half brick between your oven entrance and your front arch. You won't regret it.

Neill

Neill,
I don't agree. As you go higher there is more room for the flue entry because the diameter of the dome gets smaller. But the geometry needs to be checked to ensure there is enough room.I believe that most builders make their entries way too deep, making working the oven difficult. A shallow entry with a well funneled vent to the chimney is a better solution IMO.
Dave

[tracytracey]

Re: 42" Build Hobart

Thanks for the quick replies. I am planning on a longer chimney area. I have just put in enough of the orange insulation bricks for the dome and entry arch at the moment and will do something different for the entry floor.
Cheers James

[BrendanLovesPizza]

Re: 42" Build Hobart

seems so long ago I was at that stage, you just gotta keep at it.

Best of luck

[tracytracey]

Hi Brains Trust
I have not posted for a while but have been slowly plodding along with the build. I have now completed the dome to arch transition and have gone up 3.5 more courses. I am now realising that I do not have enough brick and will need to get some more. Is it a problem if they are not the same? I bought a kit on ebay years ago and cannot get the same bricks anymore.

Here is the most recent pic I have. I have unfortunately developed a bit of a low spot over the arch, I am slowly getting back to level with each successive course.

Cheers
James

[tracytracey]

Here are some more photos I just took. I know everyone loves photos. I might have to tidy up a bit before I take any more though.

[Gulf]

Hi Brains Trust
I have not posted for a while but have been slowly plodding along with the build. I have now completed the dome to arch transition and have gone up 3.5 more courses. I am now realising that I do not have enough brick and will need to get some more. Is it a problem if they are not the same? I bought a kit on ebay years ago and cannot get the same bricks anymore...............

Cheers
James

James,

It is thought to be better to complete the dome with what ever firebrick you start out with. However, in your case, it would be best, to at least, finish the dome with some type of firebrick. The upper part of the dome takes the most punishment when firing. So, if at all possible, don't step down to clay pavers at this point. That is my opinion.

..............Here is the most recent pic I have. I have unfortunately developed a bit of a low spot over the arch, I am slowly getting back to level with each successive course.

That is what we call the "dreaded droop". It is no biggie. It sounds like you have the right plan to get back to level. Your oven will not fall in on itself and she will cook just as good as any.

[tracytracey]

Thanks Gulf
I have some other firebricks that I'll use, they seem to be a lot denser than the others I have so I plan on mixing them in randomly.
Cheers
James