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-   -   Layer of vermiculite and super isol, Good or Bad? (http://www.fornobravo.com/forum/f8/layer-vermiculite-super-isol-good-bad-848.html)

camarina73 08-03-2006 07:24 AM

Layer of vermiculite and super isol, Good or Bad?
 
wanted to put 4" of concrete super isol and 2" of vermiculite in that order. That will put my top of landing at 42.5". Two questions. 1. Is that to high? and 2. Can I pour the concrete slab, Put super isol on top with no adhesive and then pour the vermiculite over? I wanted to do this so I would not have to adhere super isol to vermiculite layer. Please let me know your thoughts thank you.
Carlo

dmun 08-03-2006 07:42 AM

Generally speaking, you can't have too much insulation, but this may be pushing it. 4 inches of vermiculite concrete, or the equivilant 2" of super-isol is what is recommended. There is no harm in using too much, but if you are going to go wild on insulation, do it on top of the oven: Heat rises, after all.

I don't think you need both the super-isol and vermiculite concrete. Just build your support slab, and put one or the other on top.

james 08-03-2006 12:43 PM

I would agree. Using both insulators under the oven would require too much work. If you really want to do a great job of under oven insulation -- which is a very reasonable thing to do, you could either build up to 6"-8" vermiculite, or use two layers of Super Isol to 4".

That way you get great insulating values -- which I want to emphasize is perfectly reasonable, but you don't have to work with both products -- mixing vermiculite concrete and cutting and glueing Super Islo. Pick your poison, and stick with it. And build the insulating thickness you feel good about.

James

camarina73 08-03-2006 08:50 PM

but if i set the super isol on top of the concrete without gluing it and pour the vermiculite over wouldn't this hold it and not need glueing.
carlo

james 08-05-2006 04:58 PM

Hey Carlo,

Vermicutite concrete feels like Oatmeal when it's wet, and is kind of crumbly and porous when it sets. It has good compression strength to hold up your ovne, but it isn't good at holding anything together. I can't see any advantage to using both vermiculite and Super Isol together.

It's easy to hold the Super Isol board in place with either refractory mortar or the glue that is recommended for it. Or you can mix and pour the vermiculite concrete -- but you don't have to both. Save your evergy for building the oven chamber itself. :)

James

ljanmi2 08-09-2006 11:47 AM

Refractory glue for Super Isol
 
Is this glue supposed to be used underneath SuperIsol boards to fix them to the layer below, or on boad edges to join them together and make one big SuperIsol board that is large enogh for the oven that sits on top of it?

Mike

james 08-09-2006 12:14 PM

If you use the glue, it would be easy to put a little glue between the boards to hold them together a little bit, but the main idea is to hold them down and in place on the concrete slab using the glue, or mortar. The board has a nice straight edge, so it's easy to set the different pieces perfectly tight against each other.
James

redbricknick 08-09-2006 12:52 PM

isol geodesic dome.
 
I want to make a geodesic dome out of super isol board and put it over my firebrick dome. I figure I can pre build the geodesic dome to size, and install it gradually, filling whatever cavity I have with perlite. Will this be enough insulation?

dmun 08-09-2006 01:48 PM

insulation
 
Quote:

Originally Posted by redbricknick
I want to make a geodesic dome out of super isol board and put it over my firebrick dome. I figure I can pre build the geodesic dome to size, and install it gradually, filling whatever cavity I have with perlite. Will this be enough insulation?

Since two inches of super-isol equals 4 inches of vermiculite, which is the recomendation for igloo instalations, that should be plenty.

Remember: Super-isol is porous, and you need to put something waterproof over it to keep it dry. At one point I thought about putting a hard shell geodesic made of terra cotta floor tiles (it should be self supporting) and filling the cavity with vermiculite before putting the cap on.

wlively 08-09-2006 06:17 PM

Blanket?
 
Quote:

Originally Posted by redbricknick
I want to make a geodesic dome out of super isol board and put it over my firebrick dome. I figure I can pre build the geodesic dome to size, and install it gradually, filling whatever cavity I have with perlite. Will this be enough insulation?

Since isol board and insulfrax serve the same function, why would you want to cut/piece/glue the board together when you can just lay down the blanket? If you want to make the blanket hard, they sell rigidizer liquid which turns the blanket hard.
http://cgi.ebay.com/Refractory-coati...QQcmdZViewItem

Wade


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