Re: SB: RE: Structural Insulatated Panels (SIP)

[billc_lists@greenbuilder.com]

It's my understanding that phenol formaldehydes are the glues used in 
*exterior* wood products (exterior ply, osb, etc), because they are 
*not* water soluble.

Or is my logic wrong?  It's possible that exterior glues phenol 
formaldehydes which are not water soluble, but other phenol 
formaldehydes exist that are water soluble.

Can anyone clarify?  Thanks.



"Sigi Koko" <sigikoko@earthlink.net> writes to strawbale@crest.org:

>just a clarification....insulspan does not use urea formaldehyde, but they
>do use a phenolic resin which is formaldehyde-based.  This form is much more
>chemically stable than urea, so it does off-gas less, but there are still
>free formaldehyde monomers present in the binder that off-gas over time.
>(Worst right after manufacture.)  The other problem with formaldehyde resins
>is that they are water soluble, so not as durable if exposed to moisture.
>(Though theoretically, this shouldn't be an issue inside your building
>envelope.)
>Sigi
>
>-----Original Message-----
>From: julie fullmer [mailto:wellforlife@hotmail.com]
>Sent: Monday, November 12, 2001 12:24 PM
>To: strawbale@crest.org
>Subject: SB: Structural Insulatated Panels (SIP)
>
>
>I have been looking on line for info about (sip's) and one I found is called
>"Insulspan" It has No cfc's or formaldehyde. I was told the prices range fro
>$3-6 a sf depending on thinkness or whether you had tounge& groove, sheet
>rock, or isb on the bottom side. I was pretty impressed but am still going
>to try and find out more. Seems like a clean,simple,fast soulution to a
>super insulated ceiling/roof area.
>Julie
-- 
Bill Christensen
billc@greenbuilder.com

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