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-   -   Vermiculite vs. Perlite vs. blend (http://www.fornobravo.com/forum/f6/vermiculite-vs-perlite-vs-blend-5932.html)

Adrian 01-13-2009 04:27 AM

Vermiculite vs. Perlite vs. blend
 
Is there any difference between vermiculite and perlite?

I have seen several ovens with a vermicrete hearth insulation layer but perlite+concrete dome insulation. Is this for a reason?

Some ovens even use a blend (mostly 2:1) of vermiculite : perlite in their insulation layers.

I'm confused! All information / recommendations appreciate for an ingloo-style pompei brick oven.

dmun 01-13-2009 05:28 AM

Re: Vermiculite vs. Perlite vs. blend
 
They both work fine. They are different colors and textures (vermiculite is brown cubes, perlite is white spheres) I used the perlite, and it's a little easier to see when it's fully mixed in, because the white turns grey, but it's mostly a factor of what's available and affordable.

Xabia Jim 01-13-2009 11:35 PM

Re: Vermiculite vs. Perlite vs. blend
 
I used it under my hearth just fine 5.5 inches and over the dome as well. By blending the portland in the water I was able to mix in a lot of perlite.

david s 01-14-2009 02:16 AM

Re: Vermiculite vs. Perlite vs. blend
 
Perlite is a slightly better insulator than vermiculite, but is also slightly more expensive (at least it is where I live) I prefer the vermiculite to work with because perlite seems to have some really fine particles that are irritating if you breathe them, the vermiculite doesn't seem to have this problem. I guess these materials vary a bit from place to place.

thebadger 01-15-2009 10:16 AM

Re: Vermiculite vs. Perlite vs. blend
 
I used perlite (couldn't find vermiculite).

I believe I used 5 parts perlite to 1 part portland. Tip - mix the portland and perlite (or vermiculite) first THEN add the water.

My 2 cents.

Dick

glennb 01-15-2009 03:11 PM

Re: Vermiculite vs. Perlite vs. blend
 
Bit of a noob question probably, but searching hasn't revealed the answer.
When measuring the ratios, is it by volume?
ie, 5 buckets of Verm + 1 bucket of Cement, and add water?
This seems like a lot of cement, as 1 bucket will be ~25kg or an entire bag of cement?

I'm nearly finished my dome, and will be thinking about the outer insulation soon.

Les 01-15-2009 03:26 PM

Re: Vermiculite vs. Perlite vs. blend
 
By volume

Les...

asudavew 01-15-2009 07:30 PM

Re: Vermiculite vs. Perlite vs. blend
 
Quote:

Originally Posted by david s (Post 49012)
I prefer the vermiculite to work with because perlite seems to have some really fine particles that are irritating if you breathe them, the vermiculite doesn't seem to have this problem.

I completely agree.

Stick with Verm if there is a choice.


Perlite also flies into the eyes.


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