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Old 08-29-2007, 04:02 PM
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Default Lava?

Could lava rock be used for insulation?

I was just trying to think of other materials.

Lava rock is light weight and used to make rock wool.

I would sure like to know everyone's opinion!
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Old 08-29-2007, 04:14 PM
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Hi Dave,
one very easy way to check this theory out is get a sample and put in your hand with a blow torch aimed into it. You obviously need to be carefull not to burn yourself but it is a wat shown in an add for household insulation here some years ago.
You could set up a simple laboritory test type experiment with thermometers, a heat source and measure the temp rise throughout a sample, say 4 to 6 inch layer. You might also do this with a Vermiculite sample beside it to compare the results.
I would think that the mass of lava rock compared to the air trapped within it would transfer the heat, but I have never tried it.

Neill
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Old 08-29-2007, 06:42 PM
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Default Re: Lava?

I'm no expert, but the perlite that I used clearly stated on the bags that they were an organic, volcanic (lava?) product.
Thats about all I can add........

Last edited by RTflorida; 08-29-2007 at 08:22 PM.
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Old 08-29-2007, 08:38 PM
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Default Re: Lava?

Hey everyone!

I bought a 3 dollar bag of lava rock.

It was 1 cubic foot.

I grabbed a 3 inch piece......

held one end..... blow torched the other....
It glowed red on the blow torch side...... It didn't get hot on the other side that I held with my hand.

I'm gonna build a small form tomorrow.... mix some lava rocks and some cement.....

Let it set and I will test again!\

But lava rock is looking really promising and cheap!


Thanks for the responses.

Dave
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Old 08-29-2007, 08:46 PM
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Default Re: Lava?

WOW. Very interesting. Are you talking about the same stuff they put in the bottom of gas grills?
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Old 08-29-2007, 08:56 PM
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Default Re: Lava?

It was red lava rock from Lowe's....... It came in a bag.. 3 bucks and change.

I'm telling ya.... This is gonna work...

Let me make some samples and I will post results.

It looks very promising.

Dave
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Old 08-29-2007, 09:26 PM
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Default Re: Lava?

Neill...........that red lava sounds like scoria.....as you know people used it enmass in the 80's as ground cover in their gardens.
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Old 08-29-2007, 10:49 PM
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Default Re: Lava?

Quote:
Originally Posted by Bacterium View Post
people used it enmass in the 80's as ground cover in their gardens.
.... and in their barbecues? I recall practically every BBQ sold once had a 'hot rock' volcanic layer to (I assume) assist with achieving a smokey flavour in food cooked over an open grill. They don't seem to be in favour any more, or has the scoria/volcanic rock all gone?
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Old 08-30-2007, 06:46 AM
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Default Re: Lava?

Yeah that's the stuff.

And no they don't design grills to use it anymore.

I sure think one functions better with it though.
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Old 08-30-2007, 06:51 AM
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Default Re: Lava?

Scoria - Wikipedia, the free encyclopedia
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