On Sun, Aug 22, 2010 at 2:20 PM, David Beierl <dbeierl@attglobal.net> wrote:
> At 04:01 PM 8/22/2010, neil n wrote:
>>
>> http://www.icc-es.org/reports/pdf_files/ICC-ES/ESR-2142.pdf
>>
>> reading section 4.2 specifically 4.2.3. , it seems that one can use
>> this on "any or all surfaces" of detached garage, etc. But....
>>
>> My concern is section 4.2.1.2 Not sure if requirements noted regarding
>> ventilation are so that other areas of the home are not exposed to
>> potential off gassing, or, that in the event of a fire, the smoke from
>> the rigid board doesn't reach other areas as quickly.
>>
>> Any takers on whether or not I should be concernced about off gassing
>> from the DOW Styrospan I just installed in my Westy?
>
> The report appears to be primarily about fire resistance. �The attic and
> garage specs are an exception to the normal requirement that the board be at
> least 1 1/2 inches outside a fifteen-minute fire barrier in the wall --
> instead they're allowing inside installation under special circumstances,
> including that combustion air for water heaters etc be supplied presumably
> in a way that doesn't allow the board to have access to it.
>
> I think you're ok. �The stuff gradually outgasses dichlorodifluoromethane
> which is flammable and which if exposed to flame has toxic breakdown
> products. �In your quantities this should be no issue unless there's a fire.
> �Incidentally it has an ozone depletion rating of 0.065, taking R-12 as 1.0,
> so it's a remarkable improvement on same.
>
> The 70C use ratings appear to be functional rather than safety related,
> judging by the MSDS which you can find here:
> <http://www.dow.com/PublishedLiterature/dh_0067/0901b8038006758b.pdf?filepath=/PublishToInternet/InternetDOWCOM/msds/SDS_00006738_UNITEDSTATES_ENGLISH&fromPage=MSDS

Thank you VERY much.

Was just about to rip it all out. I had this nagging feeling that even
if I reduce blue rigid board from 2" to 1" thick directly behind
fridge to provide 5" min. clearance at rear of fridge, heat gathering
back there on hot days might cause it to off gas hazardous fumes.

Of course when camping, I likely pose a much more clear and present
threat with human generated hazardous fumes.    ;)

That is the gist of what I understood too. Sustained temps above
rating might cause it to expand or melt, and that it would require a
flame to ignite it.

Neil.

-- 
Neil Nicholson '81 VanaJetta 2.0 "Jaco"

http://tubaneil.googlepages.com/

http://groups.google.com/group/vanagons-with-vw-inline-4-cylinder-gas-engines