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Old 03-20-2012, 01:27 PM
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Default Hearth insulation

Hi there,

I was looking for a cheaper alternative for ceramic fiber board for the insulation of the hearth and have heard of ovens that are insulated with gas concrete (the brand name in Europe is Ytong).
Has anybody here tried this and can report of his/her experiences?

Christian
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Old 03-20-2012, 02:09 PM
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Default Re: Hearth insulation

If money is an issue why not use vermiculite? It's proven to work.
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Old 03-20-2012, 02:22 PM
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Default Re: Hearth insulation

Money is not really an issue, but on the other hand I´m not willing to pay 300€ (aprox. 350$) only for the insulation of the hearth, so I´m looking for alternatives.
Vermicrete is an alternative, I just have to check if it´s insulating properties are as good as that of Ytong. (Is the name "Ytong" common in the states for gas concrete?)
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Old 03-20-2012, 03:12 PM
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Default Re: Hearth insulation

It is better.
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Old 03-20-2012, 03:49 PM
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Default Re: Hearth insulation

Quote:
Originally Posted by Tscarborough View Post
It is better.
O.k.,

do you have any facts?
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Old 03-20-2012, 04:53 PM
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Default Re: Hearth insulation

I do, I have the same facts that you can find. Perlcrete can range up to 800 psi depending upon the mix, and a simple search of this site should reveal the posts where I researched it. AAC is brittle and fails under moderate to high heat, although that is not much of a factor for this use.

If you want advise, I gave it, if you want a report, I charge for that.
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Old 03-20-2012, 04:56 PM
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Default Re: Hearth insulation

(I don't mean to be snotty, but the question is asked frequently).
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Old 03-20-2012, 05:46 PM
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Default Re: Hearth insulation

Quote:
Originally Posted by wotavidone View Post
I have read posts on this site that say vermicrete has a rating of 100 psi. ]
Even at this low rating it is more than adequate. The foot print of one brick can support over two tons. Multiply that by the amount of bricks in the circumference of the oven and you are talking an incredible amount of weight.
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Old 03-20-2012, 06:33 PM
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Default Re: Hearth insulation

Yes, that is one of the most expensive things about building generic plans as FB has to do. For most people, the foundation, stand, and hearth slab are over engineered by magnitudes of degree. Of course some places need a seismic design and others need a 4 foot frost footing, but if the calculations are done individually for the specific location the specifications (and cost) can drop a lot, like more than 75%. The actual footprint PSI requirement for a normal oven foundation is roughly equivalent to ordinary compacted dirt.
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Old 03-21-2012, 12:29 AM
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Default Re: Hearth insulation

Quote:
Originally Posted by Tscarborough View Post
Perlcrete can range up to 800 psi depending upon the mix
That´s a fact, maybe.
But this doesn´t solve the problem.Vermicrete and Ytong are good enough at "normal" temperatures, no doubt about it. Complete houses are built using Ytong/Hebel, the problem is, is it still good enough to carry the oven dome after some fires?

By the way, in the FB plans, vermicrete is mixed with ordinary portlandcement, which is (also) not meant for high temperatures.

In fact, this mixture is proven to work, but what does this say abut the ability of Ytong?
Are the temperatures at this point (under the hearth and dome) not that high, or can portlandcement take more temperature than thought?
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