[Greenbuilding] Cob as an alternative to spray foam sealant?

[Frank Cetera]

I'd like to know the same thing Steve (using a clay slip mixture, what's the
perlite for?).  Even if no one has ever attempted it, is there anyone that
can provide any professional opinion on the matter?

Steve Satow, would it be a big deal if the cob shrank when it dried when
filling in shell air gaps?  If you dabbed the cob across any gaps and left
extra on the sides to shrink some?  How much does cob typically shrink?

"Ever since then,
I've had the idea kicking around in my head to try a clay slip/perlite
mixture sprayed into wall cavities like gunnite or shotcrete, anyone
know if this has ever been attempted?

I know it wouldn't be nearly as airtight or as insulating as spray
foam, but it would be better than nothing and still completely
biodegradable. :)"


~Frank
www.alchemicalnursery.org

Message: 5
Date: Wed, 26 Jan 2011 13:53:51 -0800
From: natural building <naturalbuilding at shaw.ca>
To: Green Building <greenbuilding at lists.bioenergylists.org>
Cc: Greenbuilding at bioenergylists.org
Subject: Re: [Greenbuilding] Cob as an alternative to spray foam
       sealant?
Message-ID: <6EF75DF2-312E-47C8-9390-B75AEE63557E at shaw.ca>
Content-Type: text/plain; charset="us-ascii"; Format="flowed";
       DelSp="yes"

Sheep's wool was traditionally used for caulking log homes.
You can still buy it ( http://www.goodshepherdwool.com ) treated with
Borax to make it more resistant to decay and fire (like blown
cellulose insulation) and it might work better in cracks because it
will swell, whereas cob is going to shrink as it dries.

Regards,
Steve Satow

www.naturalbuildingsite.net
naturalbuilding at shaw.ca

On 26-Jan-11, at 1:40 PM, Frank Cetera wrote:

> Is is doable to take wads of cob and seal up the cracks and air
> seeps that are throughout the shell of the house?

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Message: 6
Date: Wed, 26 Jan 2011 14:15:22 -0800
From: Steve <steve at greengeek.ca>
To: Green Building <greenbuilding at lists.bioenergylists.org>
Subject: Re: [Greenbuilding] Cob as an alternative to spray foam
       sealant?
Message-ID:
       <AANLkTikHJ7gdqfLeXNr=KNOF4SjreNFa+ZA_VXmUZUzm at mail.gmail.com<KNOF4SjreNFa%2BZA_VXmUZUzm at mail.gmail.com>
>
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A couple of years ago I was talking with a relative about ways to
build structures with modern techniques and traditional (natural)
materials, and the subject of spray foam came up. Ever since then,
I've had the idea kicking around in my head to try a clay slip/perlite
mixture sprayed into wall cavities like gunnite or shotcrete, anyone
know if this has ever been attempted?

I know it wouldn't be nearly as airtight or as insulating as spray
foam, but it would be better than nothing and still completely
biodegradable. :)

-Steve
--
http://www.greengeek.ca
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