Go Back   Forno Bravo Forum: The Wood-Fired Oven Community > Oven Management > Firing Your Oven

Like Tree1Likes

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 07-26-2011, 06:36 PM
Laborer
 
Join Date: Aug 2007
Location: Sherman Oaks, CA
Posts: 62
Default Question about cracks

I am sure this question has been asked and answered several times. I have looked through the threads, but unfortunately the search function on the forum doesn't seem to recognize compound words like "cracks in dome", instead it searches for anything with "cracks" and "dome"... which is virtually every post.

So I do apologize if this is redundant.

I was doing pretty well with curing my oven, got to 500deg w/o cracks. Today, I was going for 600deg and got distracted by my daughter. When I checked the temp the fire was up to 850deg. I quickly spread it out to reduce the heat. In examining the outer part of the dome, I noticed a couple cracks. Nothing major IMO but about 1/16in max. (see the pics below)

My question is what are acceptable cracks and what are problems. Should I think about patching them or is a certain amount to be expected.

Incidentally, when the outer part of the dome got warmer 100+deg and the inside cooled a bit, to 300deg the cracks seemed smaller.

The dome seems solid and there isn't anything loose.

Any thoughts?
Attached Thumbnails
Question about cracks-photo-1-1.jpg   Question about cracks-photo-2.jpg  
Reply With Quote
  #2  
Old 07-26-2011, 07:00 PM
Tscarborough's Avatar
Il Pizzaiolo
 
Join Date: Oct 2009
Location: Ausitn
Posts: 3,128
Default Re: Question about cracks

Enclose it in quotes, like you did above and it works.
Reply With Quote
  #3  
Old 07-26-2011, 11:20 PM
Laborer
 
Join Date: Aug 2007
Location: Sherman Oaks, CA
Posts: 62
Default Re: Question about cracks

It seems like it still searches for only both words, but NOT the phrase. If no one wants to answer because it has been answered before, I get it. But I have been literally been looking for a good portion of the day and can't find my answers.

Even if someone can refer me to an existing thread, that would help.
Reply With Quote
  #4  
Old 07-27-2011, 12:01 AM
brickie in oz's Avatar
Il Pizzaiolo
 
Join Date: Mar 2009
Location: Whittlesea
Posts: 3,455
Default Re: Question about cracks

Make a slurry of mortar and paint it into the cracks, do it while the oven is warn to hot and expanded, this will fill the cracks.
__________________
The English language was invented by people who couldnt spell.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Reply With Quote
  #5  
Old 07-27-2011, 11:38 AM
Neil2's Avatar
Il Pizzaiolo
 
Join Date: Oct 2006
Location: Vancouver Island
Posts: 1,374
Default Re: Question about cracks

Almost all brick oven crack to a degree. Judging by your photos, yours has cracked a bit more than most. I don't think you have to worry though. Patch it up as brickie suggests and monitor it closely for the rest of the curing firing process. Check the inside, what you should watch for is if any bricks appear to have dislodged inward.
Reply With Quote
  #6  
Old 07-27-2011, 03:04 PM
Cheesesteak's Avatar
Apprentice
 
Join Date: Mar 2011
Location: Folsom, Ca
Posts: 192
Default Re: Question about cracks

You're pictures might be deceiving me - but it looks like you can still see some moisture in the joints at the top of the oven. Is that the case - or is the mortar just a different color?

I'm not sure about your case - but I think some people get in a rush to light a fire once the dome is done. The mortar might appear dry - but it's still gaining strength for quite some time. I've read that mortar should moisture cure for a week or so. With a WFO - you're not just putting that mortar to "normal" use - its much more extreme.

I let me oven bake in the sun for weeks before I started any curing. Then - I went to an electric hotplate for a couple of days - then on to fires. I didn't measure fire temperatures - because fire temps raise / lower significantly with airflow and fuel changes - even when you just turn the logs over.

I would try to patch the cracks as much as possible - but it's really not going to "fix" the cracks. When you apply the mortar when the oven is "warm," the moisture is going to be driven from the mix - and you wont get much strength out of it. I almost think you'd be better off with a fireclay slurry - and let that get down into the cracks.

I would also wait to insulate until you've had an opportunity to fire the oven up at least once to full temps for an extended period. That'll tell you what the real impacts of those cracks are. Might not be much at all - then you can just cover with insulation and go from there.

Pizzas will still taste as good . . .
Reply With Quote
  #7  
Old 07-27-2011, 04:42 PM
brickie in oz's Avatar
Il Pizzaiolo
 
Join Date: Mar 2009
Location: Whittlesea
Posts: 3,455
Default Re: Question about cracks

The reason for a warm patch up is that the oven/crack is already expanded and the slurry will fill the expanded crack, if you patch when its cold the oven will expand and so will the crack.
Tank likes this.
__________________
The English language was invented by people who couldnt spell.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Reply With Quote
  #8  
Old 07-27-2011, 05:32 PM
Cheesesteak's Avatar
Apprentice
 
Join Date: Mar 2011
Location: Folsom, Ca
Posts: 192
Default Re: Question about cracks

Quote:
Originally Posted by brickie in oz View Post
The reason for a warm patch up is that the oven/crack is already expanded and the slurry will fill the expanded crack, if you patch when its cold the oven will expand and so will the crack.
I don't disagree with the method at all . . . I'm just pointing out that a warm/hot oven will result in a rapid moisture loss in the mortar which will likely mean it will be very weak. I was wondering, out loud, whether a slurry of fireclay would work as well - maybe better. I don't know . . . I'm just thinking out loud.

Don't you think some of that mortar looks damp???
Reply With Quote
  #9  
Old 07-27-2011, 05:37 PM
brickie in oz's Avatar
Il Pizzaiolo
 
Join Date: Mar 2009
Location: Whittlesea
Posts: 3,455
Default Re: Question about cracks

Quote:
Originally Posted by Cheesesteak View Post

Don't you think some of that mortar looks damp???
Some of it looks damp to me.
__________________
The English language was invented by people who couldnt spell.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Reply With Quote
  #10  
Old 07-27-2011, 05:49 PM
Laborer
 
Join Date: Aug 2007
Location: Sherman Oaks, CA
Posts: 62
Default Re: Question about cracks

It does look a little damp in places to me too. The dome was completed 3 weeks ago. I let it cure damp for 1 week, then took the blanket off and let it sit for another week. I live in the San Fernando Valley (Southern California) and it has been about 90+ deg so I don't know why it would still be wet... particularly toward the bottom. The bottom was done 5 weeks ago.

I need to let the inside cool to check if the crack goes all the way through.

I do appreciate all the input.

Chris
Reply With Quote
Reply

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 11:43 AM
When are cracks acceptable? Microheli Newbie Forum 11 07-25-2011 03:26 AM
help cracks!!!!!! chrispanzer Firing Your Oven 11 08-04-2010 09:44 AM
New Fire Bricks with Cracks staestc Getting Started 8 11-03-2008 05:37 AM
Small cracks in vent Yahoo-Archive Design Styles, Chimneys and Finish 0 03-19-2005 09:38 AM


All times are GMT -7. The time now is 01:52 AM.

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