#1  
Old 03-19-2005, 08:38 AM
Apprentice
 
Join Date: Mar 2005
Posts: 239
Default Small cracks in vent

My vent area leaked smoke in 3-4 places on my first outdoor mailbox
oven. I just let it fully dry out, then covered it with a second
layer of refractory mortar. Then, as Jeff says, I made sure the whole
assembly was smoke-tight before I moved on to insulation and my
finish walls.

Has anyone ever pointed their infrared thermometer at the vent
masonry when the oven it hot (I don't have a gun here). If the oven
floor is 700F +/-, how hot is the vent right about the oven opening?

James

>The cracks are no doubt due to expansion and will expand and contract with
>each firing.
>As long as they are only hairline, no need to repair. Since they almost
>disappear when
>the cladding returns to room temperature. As long as the inside bricks have
>been properly
>mortared you shouldn't have any leaks that will be a cause for concern.
>If you see smoke coming out the cracks, this may actually be water from the
>concrete or
>mortar being vaporized because of the heat. This may have added to the cause
>of the cracks
>in the first place.
>Have several more firing before you insulate and close in the dome. Monitor
>the cracks to see
>if the continue to grow in width.
>
>Jeff
>
>We lit our first fire and found a tiny hairline crack on the
>claddign around the oven. Should I fix it? How, with Concrete or
>something more flexible?
>
>Aesthetic question...
>The bricks I got have cores in them which is fine for stacking but I
>am not sure how to finish of the top so that teh holes don't show.
>On the chimney, I will likely stand the last row on end but what
>about the front facade that doesn't go as high? Any suggestions?
Reply With Quote
Reply

« - | chimney size »
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



All times are GMT -7. The time now is 12:23 PM.

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