#1  
Old 06-18-2013, 06:54 PM
Serf
 
Join Date: Mar 2009
Location: Philadelphia
Posts: 5
Default Cracks & leaking smoke

Just fired up my new pizza & bread oven. I'd finished it last fall & worked it up to temperature gradually over 2 weeks. Used it three times, then wanted to change the tilt of the entry way and had to wait until spring. So now I've finished fixing it and lit it up for the first time, and noticed that there was some (not a lot) smoke coming out of the center of the roof. I thought it might have been doing that last fall, but had forgotten about it.

Looking inside, I see there is a crack front to back of the dome of the top, and one from that crack down to one side. I built the sides of the oven with fire brick but purchased a pre-formed dome to cap it all. It's the pre-fab dome that has cracked.

1. Is this a problem? (It can't be good for insulation.)
2. If so, what can I do about it, if anything?

Needless to say, after so much work (5 years in the making, I'm embarrassed to say) this is producing a lot of anxiety!

If there's already an answer out there, just point me in the right direction.
Reply With Quote
  #2  
Old 06-18-2013, 08:53 PM
david s's Avatar
Il Pizzaiolo
 
Join Date: Mar 2007
Location: Townsville, Nth Queensland,Australia
Posts: 4,516
Default Re: Cracks & leaking smoke

The fact that the dome has cracked should not be too much of a problem because as it is a dome it will be self supporting even if it cracked into several pieces it can't collapse. You don't say whether the dome is one piece or a few, but any large pieces of refractory are subject to cracking so a number of interlocking pieces are preferable IMO. The cracks you have now got have simply created those pieces where they want to. Regarding the leaking smoke, you do have an issue because as you say you will be losing heat. If you have leaking smoke then presumably you don't have any insulation over your dome or perhaps you also have cracks in the outer shell in which case will provide an entry for water to get in by.Can you post a photo?

Last edited by david s; 06-18-2013 at 08:55 PM.
Reply With Quote
  #3  
Old 06-19-2013, 04:57 AM
Serf
 
Join Date: Mar 2009
Location: Philadelphia
Posts: 5
Default Re: Cracks & leaking smoke

Thanks for your replay. I'll post a photo later, but I have the oven under an open-sided sort of shed. No rain or snow will get directly onto/into it, though I suppose it might under extreme, blowing conditions. You are right, the outer layer is also cracked, and I assume the insulation is cracked as well since the smoke gets out. I made many layers of vermiculite/Portland to create the insulating layer, which is around 5 inches thick.
Reply With Quote
  #4  
Old 06-19-2013, 01:45 PM
david s's Avatar
Il Pizzaiolo
 
Join Date: Mar 2007
Location: Townsville, Nth Queensland,Australia
Posts: 4,516
Default Re: Cracks & leaking smoke

Plug up the cracks in the outer shell and render over them. Try to keep that new layer damp for a week by covering with plastic. Forget the cracks in the inner dome. Any attempt to fix them usually results in failure.
Reply With Quote
  #5  
Old 06-19-2013, 07:36 PM
Serf
 
Join Date: Mar 2009
Location: Philadelphia
Posts: 5
Default Re: Cracks & leaking smoke

Thanks -- I'll see if I can stuff more insulation down in -- maybe widen the crack a bit -- and then cover it with the stucco. Will keep it moist and won't use it for a couple of weeks, then will bring it up to heat slowly. Sound ok?

Here are pictures.


Reply With Quote
  #6  
Old 06-19-2013, 07:38 PM
Serf
 
Join Date: Mar 2009
Location: Philadelphia
Posts: 5
Default Re: Cracks & leaking smoke

Those photos didn't show up very well, so here's a link to an album that shows all three:

imgur: the simple image sharer
Reply With Quote
Reply

Tags
cracked dome, escaping smoke

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Long Cracks vernod Firing Your Oven 2 04-21-2012 10:43 AM
Smoke exiting thermal break mrchipster Tools, Tips and Techniques 6 10-13-2011 07:12 PM
Question about cracks cholme Firing Your Oven 18 08-05-2011 11:35 PM
Cracks with smoke coming from them Jonathan Hart Pompeii Oven Construction 12 10-07-2008 03:57 PM
Two holes (not cracks) leaking smoke: mortar or furnace cement? Fio Pompeii Oven Construction 1 07-05-2006 07:27 AM


All times are GMT -7. The time now is 11:06 AM.

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