#21  
Old 06-11-2011, 09:27 PM
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Default Re: Hi, new Aussie

Dear Vicbrickie

Know where you coming from when you say the pearlites expensive when your only supply is those pissy little 10 ltre bags from the local hardware/garden supplies. It influenced me buying ceramic blanket at $140 odd bucks which gave me 50 mm (2in) cover except for the bottom 100mm (4 in). I have since found Hydroponics supplier in local area that sells 100 ltr for $36 bucks. Now thats cheap concidering 100 ltrs is 1 Mtr2 0f material. Its worth getting some shipped to yourself.

Regards Coblerdave
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  #22  
Old 06-11-2011, 11:13 PM
Peasant
 
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Location: Victoria
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Default Re: Hi, new Aussie

yeah thanks coblerdave. the vermiculite i have used so far came in 100lt bags for around $30 a bag plus delivery. it seems reasonable. my problem is not so much what they are charging but my own budget. Except for cement, vermiculite and some bits and pieces all my matierials have been left overs or basicly scrap.

I was hoping maybe i could use some sort of building product as a loose fill as i have access to left over just about everything to build a house.
Maybe cieling batts? does anyone know if they would be suitable? toxic?
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  #23  
Old 06-12-2011, 05:09 AM
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Thumbs up Finished concrete

Looking good!

I like the finished concrete. The way you did it will be striking to see when you have those pizza parties.
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Old 06-12-2011, 05:12 AM
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Default Re: Hi, new Aussie

Dear Vic brickie
Now then your going to enclose? right? have you got a full 100 mm 4 inch (and I mean Full) of pearlite insulation over your brick Dome? If so why not use "rockwool" over the rest ? The biggest heat has been taken up by the 100 mm of pearlite so the rockwool is protected from the " big heat"check out the aussie threads there's a few of us that have done the same. Jas has en "enclosed" oven 100 mm pearlite and "rockwool" mine is 50 mm ceramic and "rockwool".....sorry I was very carefull with my words before before... I did not want to suggest that "rockwool" was a option against those hot bricks...but once there protected from that big heat ( 600 C) by a full fire proof layer any extra insulation is good thing....

Regards CobblerDave

Last edited by cobblerdave; 06-12-2011 at 05:18 AM. Reason: Add more
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  #25  
Old 06-12-2011, 03:40 PM
Peasant
 
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Default Re: Hi, new Aussie

Thanks Lburou.
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  #26  
Old 06-12-2011, 03:46 PM
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Default Re: Hi, new Aussie

I was hoping maybe i could use some sort of building product as a loose fill as i have access to left over just about everything to build a house.
Maybe cieling batts? does anyone know if they would be suitable? toxic?[/QUOTE]

Ceiling bats are ok as cobbler dave said, but if you are planning to render/stucco over it you'll find that it compresses too much. But ideal for an enclosure.
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  #27  
Old 06-12-2011, 03:56 PM
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Default Re: Hi, new Aussie

Cobblerdave. yes i do plan to enclose and im almot there with the 100mm vermiculite just need one more coat.
So when you say "Rockwool" do you mean the fibreglass based batts? or the stonewool ones?
I have no doubt that the stonewool ones would work better but i can get heaps of the glass stuff off cuts and leftovers for free.
The glass based are supposed to be good up to 230 C so im wondering if the 100mm vermiculite will protect it from enough of the big heat
Also wondering if any large cracks develop over time and enough heat gets through to affect the wool how unhealthy it will be? burning fibreglass sounds like a real bad thing to me.
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  #28  
Old 06-12-2011, 04:14 PM
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Default Re: Hi, new Aussie

Quote:
burning fibreglass sounds like a real bad thing to me.
It's the organic binder that's the problem in domestic fiberglass. It will burn and stink. It should be OK over a layer of vermiculite concrete, particularly if it four inches thick.
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  #29  
Old 06-12-2011, 04:47 PM
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Default Re: Hi, new Aussie

Dear Vicbrickie

I set out to bend a rule not break it. I fired this puppy twice and then pulled off a section at the back before i was happy. No smells, no melting... that ceramic blanket is amazing! was only warmish to the touch. It was only then that I rendered over it. Yes I used "rockwool" and the binder is sheeps wool.
Why don't you finsh the enclosure and leave the roof for a while? pack it full of rockwool and see what happens. If it doesn't work you can then change your plans with no damage done.

Hi, new Aussie-insulation-over-dome.jpg

Regards cobblerdave
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  #30  
Old 06-12-2011, 05:03 PM
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Default Re: Hi, new Aussie

Quote:
Originally Posted by cobblerdave View Post
Yes I used "rockwool"
Attachment 25052
Im confused, which isnt hard to do , but you batts look like fibreglass batts, rockwool is usually brown and stiffer.
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