annie
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Posts: 27 
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Post by annie on Apr 25, 2016 17:01:53 GMT
Hi everyone, my name is Ann and I'm from Shropshire. I joined today hoping I could get some help and advice from like minded people. We built the plinth, and half filled it with hardcore (old broken clay bricks we had). Then the last 2ft, we filled it with glass bottles mainly wine. We had to drink an awful lot  ; a) to practice for pizza parties b) and to collect enough to fill the gap! And for the top, we used a piece of thick marble we were given, and on top of that we have put a concrete base. I have read round this topic that much that now I am getting myself totally confused and worried. So here are my questions; 1. Having read CFB is carciogenic, is it safe to use? If it is covered, is it still harmful? 2. I am using bricks from a storage heaters for the interior base, can I put some form of insulation between the concrete base and the storage bricks eg. CFB in roll or board? 3. We are using bricks to make a dome and which we will gently heat when set. Then we will add foil. Then coat the dome - now can this be with perlite or vermiculite in concrete? 4. Then CFB and chicken wire. Do we do this once or twice? 5. Then the top render - what should this be? Everyone gives a different method, can I pick your brains on your tried and tested methods? Many Thanks, Ann |
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Post by richied on Apr 25, 2016 17:32:20 GMT
Welcome to the group Ann, what would you like to know?
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Post by gracie on Apr 25, 2016 17:54:54 GMT
Welcome. There's loads to read on here Ann...what in particular did you need to know?
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annie
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Posts: 27
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Post by annie on Apr 25, 2016 18:50:23 GMT
Sorry a delivery crisis, delayed my post ....Ann
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Post by gracie on Apr 25, 2016 19:01:11 GMT
Parcel or baby?!
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annie
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Posts: 27
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Post by annie on Apr 25, 2016 19:08:54 GMT
Shed hahaha x
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annie
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Posts: 27
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Post by annie on Apr 25, 2016 19:12:58 GMT
Welcome to the group Ann, what would you like to know? Thank you |
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annie
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Posts: 27
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Post by annie on Apr 25, 2016 19:13:33 GMT
Welcome. There's loads to read on here Ann...what in particular did you need to know? Thank you |
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Post by richied on Apr 25, 2016 19:31:12 GMT
1. Having read CFB is carciogenic, is it safe to use? If it is covered, is it still harmful? 2. I am using bricks from a storage heaters for the interior base, can I put some form of insulation between the concrete base and the storage bricks eg. CFB in roll or board? 3. We are using bricks to make a dome and which we will gently heat when set. Then we will add foil. Then coat the dome - now can this be with perlite or vermiculite in concrete? 4. Then CFB and chicken wire. Do we do this once or twice? 5. Then the top render - what should this be? Everyone gives a different method, can I pick your brains on your tried and tested methods? Many Thanks, Ann In answer to #1, the modern equivalent of CFB is non carcinogenic. I queried this just this afternoon with a supplier. The modern type is still fibrous, although the fibres break down if ingested. For cutting materials like this I always wear a good respirator. Screwfix sell one for about £15 which is really effective (http://www.screwfix.com/p/jsp-tradesman-2-28-day-half-mask-a1p2/14194) #2 50mm of board is recommended, or 100mm of perlite/ vermiculite. The board is easy to source in the UK. #3/4/5 With mine, which I am building this week, the dome will have 50mm of 96kg blanket, which is then wrapped in chicken wire and rendered (once or twice depending on how thick you want your render) with 4:1 sand/ cement + waterproofing additive (this is based on the forno bravo plans, which if you haven't downloaded yet, are essential (https://www.fornobravo.com/pompeii-oven/pompeii-oven-plans/). others may tell you to add yet more insulation on top of the blanket, but for a domestic installation, that's probably above and beyond the call of duty. |
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annie
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Posts: 27
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Post by annie on Apr 25, 2016 19:42:04 GMT
Thank you Richied that is really helpful.
So under my storage heater bricks you think 50mm of board would be enough?
I have noticed in my readings people using rockwool. Do you know if they mean rockwool as in wall floor insulation? I was just wondering as its a its a lot cheaper than ceramic fibre, although when I looked the fire rockwool up and its specifications, I wasn't so sure......Ann
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Post by richied on Apr 25, 2016 19:58:28 GMT
Rockwool is A1 rated up to 1,000 °C, which would be fine for an oven. However, could it cope with the weight of more than half a ton on top? Does anyone else have experience of Rockwool as an oven insulator?
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Post by richied on Apr 25, 2016 20:03:19 GMT
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annie
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Posts: 27
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Post by annie on Apr 25, 2016 20:04:37 GMT
I watched a video on one of the pizza ovens from portugal being sold on Ebay. It mentioned rockwool, and they put it in the floor under the tiles. I went on the site, and read the specs. It is okay up to 1000 but at 250 some chemical bonding etc breaks down but it retains its shape. So not sure but it is a lot cheaper.
On another note, did you pay $3 for your pompeii download? I don't mind paying it, Im just making sure I have the right one...
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annie
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Posts: 27
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Post by annie on Apr 25, 2016 20:24:49 GMT
On Castreekilns they offer 2 types of ceramic fibre blanket. One they say is carcinogenic - and one is body (bio) soluble and not carcinogenic. I think it's the fibres. One dissolves in the lungs and one does not?
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Post by cobblerdave on Apr 25, 2016 21:07:18 GMT
G'day
Sorry don't agree that domestic rock wool is suitable.
Under the oven any blanket insulation the air spaces are squashed flat by the weight. A cheap local available alternative is thermolite block.
Domestic rock wool has organic binders that breakdown at 350 c making it a one off use. There are rockwool insulation made without these binders and are suitable. It's just a case of finding them.
I have 50 mm of ceramic insulation which protects a layer of rockwool over that. The rockwool only works because of the layer of ceramic protects it.
Regards dave
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; a) to practice for pizza parties b) and to collect enough to fill the gap! And for the top, we used a piece of thick marble we were given, and on top of that we have put a concrete base.
