#51  
Old 11-06-2013, 07:37 AM
Peasant
 
Join Date: May 2013
Location: Manchester, UK
Posts: 31
Default Re: My UK build is out of the ground!

Cheers Bookemdanno,

Don't mind doing an extra coat, just could do without buying another 4 bags of vermiculite if its not needed.

Yeah, im beginning to rethink the buttressing. I think I will just create a platform for a chimney anchor plate directly on the arch.
I am going to have a section of twin wall flue, so no great weight as you say.

Didn't you do a k-rend finish? how did you find the application? never tried it myself?

Cheers

Allan
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  #52  
Old 11-06-2013, 08:41 AM
stonecutter's Avatar
Il Pizzaiolo
 
Join Date: Jun 2007
Location: South Carolina,USA
Posts: 1,844
Default Re: My UK build is out of the ground!

Quote:
Originally Posted by vincentvega_uk View Post

Yeah, im beginning to rethink the buttressing. I think I will just create a platform for a chimney anchor plate directly on the arch.
I am going to have a section of twin wall flue, so no great weight as you say.
I want to clarify my earlier posts about buttressing. My posts were directed towards you stating that you were building a vault in post #24 and then vault arch in post #43....I misunderstood what you were doing, and thought you were building a vault surround over your dome......my bad. Correct, you do not need to buttress a semi arch that is only carrying a couple flues.

As a point of reference, a vault is longer than it's diameter... so what you are doing over the vent is technically not a vault. If it is, you will have a long reach into the oven!
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  #53  
Old 11-06-2013, 12:48 PM
Peasant
 
Join Date: May 2013
Location: Manchester, UK
Posts: 31
Default Re: My UK build is out of the ground!

Probably my awful terminology Stonecutter.

Anyway, its a lot clearer now, no matter what its called!

Cheers

Allan
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  #54  
Old 11-06-2013, 06:58 PM
cobblerdave's Avatar
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Join Date: Jan 2010
Location: brisbane australia
Posts: 2,264
Default Re: My UK build is out of the ground!

Quote:
Originally Posted by vincentvega_uk View Post
Brilliant, thanks. Will save me a few !

Also what kind of depth coverage with my ceramic fibre blanket do people think I need to do without the vermiculite concrete?
If I have enough fire blanket I intend to chicken wire it then put a base coat of render on before my finished coat.

Cheers

Allan
Gudday Allan
V-Crete V ceramic. Ceramic is roughly twice as efficient as V Crete ie 1 in of ceramic equals the same as 2 in of V-Crete. So if go 3 ins of ceramic you have roughly the insulation value of 6 ins of V-Crete. And no water to dry out!
I used dry insulation and rendered over the top of a chick wire layer. I have used Pearl-Crete before and its a real pain to put on,much harder the rendering away a few lumps and bumps. And you don't have get ride of a huge amount of water furtherest from the heat.
If money was tight and I had the time, and patience V-Crete is the obvious choice.
If I had 3 ins of ceramic I would not waste any time or effort into V-Crete
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  #55  
Old 11-08-2013, 05:11 AM
Apprentice
 
Join Date: Oct 2011
Location: Bungay, Suffolk, UK
Posts: 151
Default Re: My UK build is out of the ground!

K-rend...

I actually liked it, as it was a similar finish to my original Lime render. Its very granular and coarse, but following the mixing instructions and going for a two stage mix made a very workable mix. I didn't go for the usual scarified finish, as i used my curved trowel and the wooden float still gave an open texture. Using a gauging trowel to apply the render first. It goes off pretty quickly so i'd advocate mixing up at a half bag a time. It comes in many colours, and is a reasonable price. The silicone within the render makes any rainfall just bead up and roll off with very little sight of soaking in.
I have to admit that i haven't fired my oven since rendering it, and with winter now closing its grip, i expect i'll leave it until spring rather than risk cracks, no time to fix and another winters rainfall, snow, etc soaking into my lovely dry dome. For safety, i'd always say to set in a heat break between any render and chimneys, etc. There are plenty of heat proof mastics to fill in the heat breaks to weatherproof everything up again.
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  #56  
Old 11-11-2013, 10:28 AM
Peasant
 
Join Date: May 2013
Location: Manchester, UK
Posts: 31
Default Re: My UK build is out of the ground!

Thanks Cobblerdave, hopefully I will have enough cover of ceramic blanket,( I already have it), I think I will.
Then I can just do a course base coat of render before I apply my final base coat and top coat.

Cheers
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  #57  
Old 11-11-2013, 10:38 AM
Peasant
 
Join Date: May 2013
Location: Manchester, UK
Posts: 31
Default Re: My UK build is out of the ground!

Cheers Bookemdanno,

So with the two coat, is that using the k rend base coat they make before the final k rend finish?
With the silicone in the k rend, I take it you don't add an integral waterproofer?
Also what scratch coat mix did you use? 4:1 plastering sand-cement?
I intend on the scarified finish myself.
I also take your advice on the heartbreaks. Would that also be needed in my 'vault' area between the brickwork and render? Bearing in mind I have built a heartbreak out of insulation brick in the hearth between the oven and vault, and also between the oven arch and the vault arch.
It would be interesting to know how hot the vault area and chimney gets with the get breaks installed.

Many thanks

Allan
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  #58  
Old 11-11-2013, 10:40 AM
Peasant
 
Join Date: May 2013
Location: Manchester, UK
Posts: 31
Default Re: My UK build is out of the ground!

Any advice on flue length and diameter for a 40 inch oven anyone?

Thanks again

Allan
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  #59  
Old 11-11-2013, 11:37 AM
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Join Date: Jul 2010
Location: Seattle
Posts: 1,320
Default Re: My UK build is out of the ground!

8 inch diameter, at least 3 feet tall.
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  #60  
Old 11-12-2013, 12:40 PM
Peasant
 
Join Date: May 2013
Location: Manchester, UK
Posts: 31
Default Re: My UK build is out of the ground!

Quote:
Originally Posted by deejayoh View Post
8 inch diameter, at least 3 feet tall.
Great, thanks.

Allan
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