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Clamp Kiln Vault And Chimney

 
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Old 04-10-2016, 10:19 AM   #21
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Re: Clamp Kiln Vault And Chimney


This is a great thread! Where is your project located? Very interesting.


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Old 04-14-2016, 12:11 AM   #22
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Re: Clamp Kiln Vault And Chimney


Wow, that is a really big kiln! I think the suggestion by Dom-mas to use some sort of plaster for waterproofing is the way to go.

I see it's awood fired kiln, how much does wood does it take for a session? I'm guessing at least a cord?
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Old 04-14-2016, 07:31 AM   #23
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Re: Clamp Kiln Vault And Chimney


Quote:
Originally Posted by dom-mas View Post
a plaster sounds like a good idea
But what kind of plaster? cement /sand gets small cracks and becuase it is curved sometimes bigger cracks. Also the heat comes through the roof .

I will probably try a clay/sand/lime thinck plaster and then lime wash several times a year.

I will eventaully be making roofing tiles as a solution, but it is expensive.
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Old 04-14-2016, 07:37 AM   #24
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Re: Clamp Kiln Vault And Chimney


Quote:
Originally Posted by Rio View Post
Wow, that is a really big kiln! I think the suggestion by Dom-mas to use some sort of plaster for waterproofing is the way to go.

I see it's awood fired kiln, how much does wood does it take for a session? I'm guessing at least a cord?
Since some years I only use wood to get it going . the tunnels are stacked with jatropha waste ( used for biofuels). the firewood gets the biofuel going. Then every layer has a sprinkling of "charcoal dust" . the charcoal dust can be even 1/2 inch pieces and is what falls on the ground or rejected.

When i used only firewood it took about 7 -10 cords of wood!!

On a good burn i can get 27,000 bricks.
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Old 04-14-2016, 02:18 PM   #25
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Re: Clamp Kiln Vault And Chimney


That's a lot of bricks! I was only off on my guestimate of fuel consumption by 70 - 90%!

Talk about generating a lot of heat, when that thermal mass of 27,000 bricks is all heated up it really must be something.
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Old 04-14-2016, 06:40 PM   #26
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Re: Clamp Kiln Vault And Chimney


Quote:
Originally Posted by Fundi View Post
But what kind of plaster? cement /sand gets small cracks and becuase it is curved sometimes bigger cracks. Also the heat comes through the roof .

I will probably try a clay/sand/lime thinck plaster and then lime wash several times a year.

I will eventaully be making roofing tiles as a solution, but it is expensive.
What about multiple layers of lime/sand, that way hopefully it won;t crack in the same spot in 2 different layers.

I've seen lots of chimneys all parged up with lime mortar that's 130 years old and only now needing repair and I've seen 30 year old portland parging that is all cracked to sh!t and falling off. I think the lime mortar has more ability to expand and contract due to thermal expansion as well as other types of movement. Not sure why the code doesn;t allow for its use in chimneys anymore. But with your kiln the roof may be getting hot enough to restart the rx which begins around 800C and is in full swing by 900C...does your roof get anywhere near there?

Edit...I just re-read and the sand/lime/clay plaster sounds good...the clay might bond with the lime and keep it from reacting as early
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Old 04-17-2016, 02:24 PM   #27
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Re: Clamp Kiln Vault And Chimney


Sand/lime/cow dung used to be a popular mix for parging flues. 3/1/1
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Old 04-17-2016, 06:17 PM   #28
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Re: Clamp Kiln Vault And Chimney


Quote:
Originally Posted by Rio View Post
Wow, that is a really big kiln! I think the suggestion by Dom-mas to use some sort of plaster for waterproofing is the way to go.

I see it's awood fired kiln, how much does wood does it take for a session? I'm guessing at least a cord?


Obviously Fundi has a exact handle on his kilns fuel consumption. For those interested,here is a free book that reflects on brick making in the late 1800,s. If memory serves,the author said it took 600 lbs. of wood to fire a thousand brick,or 300 lbs. of coal. I can't remember if his kiln had a casing or not.
https://books.google.com/books/about...d=mBYLAAAAIAAJ
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Old 04-17-2016, 06:21 PM   #29
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Re: Clamp Kiln Vault And Chimney


For those who have not seen this on previous threads,here is a video of the brick firing at Colonial Williamsburg Va. The speaker,Jason does a great job of explaining the process.



Enjoy !



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Old 09-11-2016, 06:18 AM   #30
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Re: Clamp Kiln Vault And Chimney


i did the clay/sand/lime plaster and then multiple lime wash. after 2 burnings I have hairline cracks but one coat of lime wash fixes that.

this was immediately after 4 limewash coats.
Clamp kiln vault and chimney-img_20160716_102850.jpg

the clay/lime/sand dries until "leather hard" and then you repeatedly press it down with a putty knife and it becomes very hard and smooth. Important step.

Clamp kiln vault and chimney-img_20160504_092627_1cs.jpg

showing a crack after a burn.

Clamp kiln vault and chimney-img_20160716_102921.jpg
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Old 09-11-2016, 06:26 AM   #31
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Re: Clamp Kiln Vault And Chimney


this is how i had the chimney before posting the first pictures.

Clamp kiln vault and chimney-img_20160405_150337.jpg

From comments i received i change the top and made it flat and and removed the cover. I also opened up the opening a bit inside the kiln.
It works well. Am surprised as this is the first chimney I have made.

We find we have to leave the door open for a few hours until it is a bit warm and then we brick up the doors.

if you look above the chimey you can notice the heat.



Clamp kiln vault and chimney-img_20160630_184021.jpg
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Old 09-11-2016, 06:32 AM   #32
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Re: Clamp Kiln Vault And Chimney


Too bad this beautiful ceiling is inside a dirty dusty kiln.

Clamp kiln vault and chimney-unspecified.jpg

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