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Post by Deleted on Aug 4, 2017 12:57:20 GMT
After discovering this forum and having a good read, has made me question my design???
I am in the process of building a 30" Pompeii. After spending time looking at various sources online I had planned on insulating the hearth with 50mm ceramic board, the firebrick dome with 50mm ceramic blanket before caging it in chicken wire then render. That was the plan anyway.
After reading that vermicrete is recommended by a good few of you guys as an extra layer before rendering.
The problem I have is that my hearth should have been a good few inches wider so don't really have enough space for the extra layer of vermicrete otherwise it'd be hanging over the side of the hearth by an inch either side.
What advise would you give? Make the oven smaller to accommodate the vermicrete or would my original plan suffice??
Any advise would be very welcome.
Cheers
Scott
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Post by devontiger on Aug 4, 2017 15:18:58 GMT
Is this the style you are wanting?  |
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Post by dave36 on Aug 4, 2017 17:02:32 GMT
After discovering this forum and having a good read, has made me question my design??? I am in the process of building a 30" Pompeii. After spending time looking at various sources online I had planned on insulating the hearth with 50mm ceramic board, the firebrick dome with 50mm ceramic blanket before caging it in chicken wire then render. That was the plan anyway. After reading that vermicrete is recommended by a good few of you guys as an extra layer before rendering. The problem I have is that my hearth should have been a good few inches wider so don't really have enough space for the extra layer of vermicrete otherwise it'd be hanging over the side of the hearth by an inch either side. What advise would you give? Make the oven smaller to accommodate the vermicrete or would my original plan suffice?? Any advise would be very welcome. Cheers Scott [ Scott, I have 50mm board (below 64mm firebricks) and 50mm blanket, then render (3cm ish) and the insulation works for me. Slightly warm to the touch when oven at full blast and I can cook in it the next day (say 350 AM dropping to 150-200 PM). I think you'll be fine. Dave |
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Post by Deleted on Aug 5, 2017 19:10:42 GMT
Is this the style you are wanting? I'm planning on doing a handmade dome with a brick and a half deep arch |
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Post by Deleted on Aug 5, 2017 19:15:14 GMT
After discovering this forum and having a good read, has made me question my design??? I am in the process of building a 30" Pompeii. After spending time looking at various sources online I had planned on insulating the hearth with 50mm ceramic board, the firebrick dome with 50mm ceramic blanket before caging it in chicken wire then render. That was the plan anyway. After reading that vermicrete is recommended by a good few of you guys as an extra layer before rendering. The problem I have is that my hearth should have been a good few inches wider so don't really have enough space for the extra layer of vermicrete otherwise it'd be hanging over the side of the hearth by an inch either side. What advise would you give? Make the oven smaller to accommodate the vermicrete or would my original plan suffice?? Any advise would be very welcome. Cheers Scott [ Scott, I have 50mm board (below 64mm firebricks) and 50mm blanket, then render (3cm ish) and the insulation works for me. Slightly warm to the touch when oven at full blast and I can cook in it the next day (say 350 AM dropping to 150-200 PM). I think you'll be fine. Dave Cheers for the advice Dave. I reckon I'll stick with the original plan then. I'd be more then happy with those temperatures |
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Post by downunderdave on Aug 6, 2017 14:06:15 GMT
After discovering this forum and having a good read, has made me question my design??? I am in the process of building a 30" Pompeii. After spending time looking at various sources online I had planned on insulating the hearth with 50mm ceramic board, the firebrick dome with 50mm ceramic blanket before caging it in chicken wire then render. That was the plan anyway. After reading that vermicrete is recommended by a good few of you guys as an extra layer before rendering. The problem I have is that my hearth should have been a good few inches wider so don't really have enough space for the extra layer of vermicrete otherwise it'd be hanging over the side of the hearth by an inch either side. What advise would you give? Make the oven smaller to accommodate the vermicrete or would my original plan suffice?? Any advise would be very welcome. Cheers Scott Adding a vermicrete layer between the blanket and the outer rendered shell has a couple of advantages. Firstly it makes a good firm substrate to render against. You can render straight onto the blanket, but it's a bit springy and is difficult to work over. Secondly, the vermicrete evens out all the lumps and bumps of the blanket surface, with the vermicrete you can get back to a perfect hemispherical form. It is also a cheaper insulation layer and almost as good as blanket if the mix is lean. There are a few options for you that I can think of... 1. One layer 25 mm blanket, 25mm or more of vermicrete, rendered outer shell 2. Reduce inner oven diam. 3. Two layers of blanket (50 mm), then rendered outer shell 4. Abandon oven project and turn it into a chicken coop. 5. Buy a telescope and convert oven into an observatory. |
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Post by Deleted on Aug 7, 2017 6:28:22 GMT
After discovering this forum and having a good read, has made me question my design??? I am in the process of building a 30" Pompeii. After spending time looking at various sources online I had planned on insulating the hearth with 50mm ceramic board, the firebrick dome with 50mm ceramic blanket before caging it in chicken wire then render. That was the plan anyway. After reading that vermicrete is recommended by a good few of you guys as an extra layer before rendering. The problem I have is that my hearth should have been a good few inches wider so don't really have enough space for the extra layer of vermicrete otherwise it'd be hanging over the side of the hearth by an inch either side. What advise would you give? Make the oven smaller to accommodate the vermicrete or would my original plan suffice?? Any advise would be very welcome. Cheers Scott Adding a vermicrete layer between the blanket and the outer rendered shell has a couple of advantages. Firstly it makes a good firm substrate to render against. You can render straight onto the blanket, but it's a bit springy and is difficult to work over. Secondly, the vermicrete evens out all the lumps and bumps of the blanket surface, with the vermicrete you can get back to a perfect hemispherical form. It is also a cheaper insulation layer and almost as good as blanket if the mix is lean. There are a few options for you that I can think of... 1. One layer 25 mm blanket, 25mm or more of vermicrete, rendered outer shell 2. Reduce inner oven diam. 3. Two layers of blanket (50 mm), then rendered outer shell 4. Abandon oven project and turn it into a chicken coop. 5. Buy a telescope and convert oven into an observatory. I must admit I do still like the idea of adding the extra layer. I spent yesterday planning the opening and arch, I really don't want to make the dimensions any smaller. I already think the opening is pretty small as it is. I've already got the 50mm blanket so will have to make it work. I'm now thinking of extending the hearth, surrounding the oven with some sort of large thick tiles by a couple of inches either side. This way I gain the size needed without compromising. Do you think this would work? As for the chicken coop & observatory, I'll bare those in mind....... Scott |
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