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  #61  
Old 08-12-2014, 05:53 AM
Laborer
 
Join Date: Feb 2011
Location: Slovakia
Posts: 71
Default Re: 42" in Hungary by Slovak guy ;)

either way, i will need then two rolls onlt, so it will be 120 or 160 EUR (100 kg/m3 or 130 kg/m3)
dont need to bother with rockwool
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  #62  
Old 08-12-2014, 06:01 AM
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Il Pizzaiolo
 
Join Date: May 2012
Location: Salt Lake City, Utah
Posts: 1,947
Default Re: 42" in Hungary by Slovak guy ;)

Alex,

Are you enclosing your oven? Any consideration of perlite or vermiculite? Not a thermally efficient by could be substantially less costly. If you are doing an enclosed build you could just pour it in dry or if you are doing an igloo use a cement/perlite/vermiculite mix.
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  #63  
Old 08-12-2014, 06:05 AM
Laborer
 
Join Date: Feb 2011
Location: Slovakia
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Default Re: 42" in Hungary by Slovak guy ;)

thanks for tip but i want it to be bare, no housing
something like

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  #64  
Old 08-12-2014, 09:54 AM
Peasant
 
Join Date: Apr 2014
Location: Slovenia
Posts: 48
Default Re: 42" in Hungary by Slovak guy ;)

Quote:
Originally Posted by alex.g View Post
did you use it? How thick?
I used 2 layers of 4 cm and and extra 4 cm on top. Because it already has chicken wire on the back it is really easy to make nice dome shape. I then covered it with 5cm of Baumit ThermoPutz (perlite / cement mix).

I am using my oven for two months now and here are some temperatures:
- oven completely clears in one hour and reaches 710 deg C on top. I let fire burn for additional hour to soak heat in to the bricks. I remove embers after waiting another hour. At that time dome bricks are 450 deg C and floor bricks at 430 deg C.
- Outside is cold!!!, under floor slab heats up 10-15 deg C

- After two days I can still cook "Gulas" temps: dome 190 deg C, floor 160 deg C.

If rockwool binding would be affected by heat it would smell but it does not. After all there are over 100 rockwool variants and some are ment for high temperatures and some are not.
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  #65  
Old 08-12-2014, 11:04 AM
Laborer
 
Join Date: Feb 2011
Location: Slovakia
Posts: 71
Default Re: 42" in Hungary by Slovak guy ;)

Wow, 12 cm on top then, right?
Good tip for thermoputz, thanks. How did you apply it? Mentioned thickness at once or few layers? Did you put DuoContact as a primer layer?
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  #66  
Old 08-12-2014, 11:19 AM
Peasant
 
Join Date: Apr 2014
Location: Slovenia
Posts: 48
Default Re: 42" in Hungary by Slovak guy ;)

Yes, 12 cm on top. I aplied two layers of thermoputz (max 3cm in one layer). Get some reinforcement fibers and mix it in to prevent cracks.

I used tile glue as prime layer.
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  #67  
Old 08-12-2014, 01:23 PM
Laborer
 
Join Date: Feb 2011
Location: Slovakia
Posts: 71
Default Re: 42" in Hungary by Slovak guy ;)

what fivers did you use, please? how much did you put into the putz mix, a bucket?
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  #68  
Old 08-12-2014, 01:49 PM
Peasant
 
Join Date: Apr 2014
Location: Slovenia
Posts: 48
Default Re: 42" in Hungary by Slovak guy ;)

Hi Alex

I used glass fibers about one fist full for one bag of thermoputz. You can get small bag of fibers (1 kg), that is all you would need. Mix 1 40 liter bag of thermoputz with 18-19 liters of water. You can trowel it on but I found it is much easier to just throw it on and use trowel to level it. I used 3 bags of thermoputz.

You must dry thermoputz for about two weeks before covering it with final layer, althou it is hard the next day.

I covered it with additional 2cm layer of high strength concrete (baumit hobybeton), added hydrated lime to make it stick and again fibers for reinforcement.
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  #69  
Old 08-12-2014, 02:13 PM
Laborer
 
Join Date: Feb 2011
Location: Slovakia
Posts: 71
Default Re: 42" in Hungary by Slovak guy ;)

so once again, 12cm of rock wool, 5 cm of thermoputz and finally 2cm of concrete mix?
is thermoputz ok for final finish? is it white?
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  #70  
Old 08-12-2014, 02:25 PM
Peasant
 
Join Date: Apr 2014
Location: Slovenia
Posts: 48
Default Re: 42" in Hungary by Slovak guy ;)

Quote:
Originally Posted by alex.g View Post
so once again, 12cm of rock wool, 5 cm of thermoputz and finally 2cm of concrete mix?
is thermoputz ok for final finish? is it white?
Yes that is what I have. Thermoputz is light gray when dry but must be protected from rain! Do you get any snow? If yes then you need to add concrete.
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