Interesting way to get a dome shape...

[Mitchamus]

Cut the dome angle into the face of the brick and lay it flat...

[DrakeRemoray]

Re: Interesting way to get a dome shape...

Never seen that before...pretty cool.

[Mitchamus]

Re: Interesting way to get a dome shape...

I don't think it would be as strong as a proper dome.
...no-where near it... now I think about it.

[dmun]

Re: Interesting way to get a dome shape...

Oh my, another uninsulated oven... (beats head on desk)

[ThisOldGarageNJ]

Re: Interesting way to get a dome shape...

he must like to buy firewood,,, or we can hope he isnt finished yet !

[kebwi]

Re: Interesting way to get a dome shape...

Despite tapering the inner faces so as to avoid a stepped appearance on the interior, that is good old fashioned corbel arch. Not to pass judgment or anything, but theoretically that is a much weaker arch than a keystoned catenary (or pseudo catenary with the true catenary contained within the middle third of the actual arch).

...on the other hand, if it doesn't fall in, who cares? I get the impression these ovens are over-built beyond theoretical arch specifications by many orders so that nonideal shapes end up stable enough to do the job, i.e., to support the oven's weight long enough to use without impairing one's enjoyment of them (several years).

Best of luck.

Cheers!

[Neil2]

Re: Interesting way to get a dome shape...

A corbel arch is not as structurally sound as compression arch (with keystone). Repeated heating and cooling cycles will further weaken it as the bricks creep back. In a normal compression dome (such as most of us build) heating and cooling cycles are not a problem.

I would strongly recommend against this type of construction.

[Archena]

Re: Interesting way to get a dome shape...

I can't see the video (dial up can be a bummer) so I'm having to go on your description. If I've understood correctly, the cut side of the brick would be exposed to the interior of the dome, right? As I understand it the interior of a brick is somewhat softer than the exterior. (I'm not sure if that would also be true for firebrick.) If so, wouldn't that increase the likelihood of spalling?

[ThisOldGarageNJ]

Re: Interesting way to get a dome shape...

I can't see the video (dial up can be a bummer) so I'm having to go on your description. If I've understood correctly, the cut side of the brick would be exposed to the interior of the dome, right? As I understand it the interior of a brick is somewhat softer than the exterior. (I'm not sure if that would also be true for firebrick.) If so, wouldn't that increase the likelihood of spalling?

I dont think its the cut side of the bricks concerning everyone here as much as the method of construction, The bricks are cut on an angle almost the full length to reach the center and receive very little support rom the brick below it.... I was trying to capture a pic from the vid to post for you but couldnt,, Can someone do that ?? Wood fired bread or pizza oven here is a link to pics of a similar corbel arch oven, But this builder didnt cut the bricks on the inside he left them whole

Mark

[Archena]

Re: Interesting way to get a dome shape...

Thanks, I appreciate the attempt.

I did understand the structural concern. I was just wondering if spalling would also be a problem. (Assuming the thing doesn't collapse first.)

[ThisOldGarageNJ]

Re: Interesting way to get a dome shape...

I dont see why spalling would be a problem as long as he used regular fire brick and refractory cement.. Unless he had unusually large mortatr joints due to his cutting "technique" I think You might get a few stress fractures if your not counting that the same, or as you said it didnt collapse first,,,,,

[drogers]

Re: Interesting way to get a dome shape...

An interesting approach to construction.