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Old 08-22-2012, 06:36 PM
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Default Insulation recommendations

Howdy folks, just finished up my 42" oven, standard build, and I have 3 rolls of 1" blanket for insulation of dome. Have a couple of questions please:

1. Do I just insulate the dome, or do I include the arch, inner and up to outer area?

2. I saw a post by a FB Moderator that stated FB recommends either blanket or vermiculate, not both. My intent was to use 3 layers of blanket, then cover this with vermiculite/concrete as in manual, is this the correct way?

3. Anyone who built a 42" remember how much vermiculite and concrete they purchased, and what worked for them in regards to proper mixing, and applying the product to the dome already covered with blanket?


Thank you in advance for any tips/info! Take care, pat
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Old 08-22-2012, 06:38 PM
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Default Re: Insulation recommendations

Insulate everything you can.

Perlcrete/vermicrete will just compress the blankets reducing their efficiency.
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Old 08-22-2012, 09:10 PM
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Default Re: Insulation recommendations

Pat,

I covered my blanket with vermiculite /portland mix - I think it was 5 to 1 (I purchased no more than three bags for the entire build). I built a cage with re-bar and chicken wire. I don't have a link to the exact page but if you slog through my build you can see the evolution (start some where in the middle). If I have time in the A.M. I will try and give you the correct page.
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Old 08-23-2012, 11:38 AM
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Default Re: Insulation recommendations

thanks gents, should have clarified that i my intent is to keep the dome like yours Les, not framed in, we have a pond behind and dont want to hinder view any more than possible. do you have any trouble with water, how do you keep the stucco water proofed?
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Old 08-23-2012, 07:09 PM
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Default Re: Insulation recommendations

If you are covering the dome with vermicrete and you make it a lean brew (10:1) it is very light and does not compress the blanket. By volume use 10:1:3 vermiculite, cement, water.
By adding the vermicrete over the blanket you can get the form back to a true hemisphere, where it was left somewhat lumpy with all the bumps and folds in the blanket.
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Last edited by david s; 08-23-2012 at 07:15 PM.
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Old 08-24-2012, 11:44 AM
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Default Re: Insulation recommendations

Quote:
Originally Posted by irelande5 View Post
thanks gents, should have clarified that i my intent is to keep the dome like yours Les, not framed in, we have a pond behind and dont want to hinder view any more than possible. do you have any trouble with water, how do you keep the stucco water proofed?
No trouble with water at all. I am noticing a little chipping at the base caused by freezing. A little touch up and all will be good. I used a product made by Dryvit - it's acrylic based and does a great job of repelling water.
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Old 08-24-2012, 04:23 PM
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Default Re: Insulation recommendations

Hi Pat
I'm at about the same point as you, a little behind, but have the same question. I've always wanted to keep the dome shape - it was always about building a round thing out of square things, after all!
So, we wrap with blanket (1" seems thin to me - not sure what thicknesses I will be able to get yet), then cover with a very light mix of vermicrete, then I had planned to render the outside with something waterproof. My neighbour is a very skilled plasterer who will help me make the last layer look professional.
Is this the sort of approach you also had in mind?

Thanks
JT
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Old 08-24-2012, 04:44 PM
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Default Re: Insulation recommendations

Quote:
Originally Posted by jab49 View Post
So, we wrap with blanket (1" seems thin to me - not sure what thicknesses I will be able to get yet
JT - don't mean to hi-jack but I used 1 inch blanket and wrapped it 3 to 4 inches thick. The crap is really hard to shape and nasty to work with. If you can - over insulate!
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Old 08-24-2012, 05:09 PM
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Default Re: Insulation recommendations

Thanks Les - that makes sense. So if my dome has a surface area of say, 2.73 sq m, allow for 3-4 times that in blanket. And allow for the chimney support up to the outer arch, I'm assuming, too.
Cheers

JT
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Old 08-24-2012, 11:42 PM
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Default Re: Insulation recommendations

Has anyone done the straight 6" of Vermicrete?
Allegedly, it'll give the same insulation value. Seems an easier option than Fibre Roll?
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