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Old 05-04-2011, 12:56 PM   #11
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i'd be happy to see them. i do know manufacturer print material claims/specs do not supersede building code. those claims by icynene are just manfac. claims, not code. i just finished state licensing in alabama, which goes by IRBC. asbestos siding door to door salesman used to have a pamphlets too lol.
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Old 05-04-2011, 01:36 PM   #12
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Fire resistance by useing a green propellant
Wood rot pro and con
http://greenhomeguide.com/askapro/qu...am-to-insulate
Differences
http://www.sprayfoam.com/spps/ahpg.cfm?spgid=6

I could not find anything online other than an Icynene advertisement about what hapens after getting wet. So i will ask Jim.
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Old 05-04-2011, 04:33 PM   #13
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Quote:
Originally Posted by Bullshark View Post
Fire resistance by useing a green propellant
http://www.youtube.com/watch?v=1Hvtz8YolC0
Wood rot pro and con
http://greenhomeguide.com/askapro/qu...am-to-insulate
Differences
http://www.sprayfoam.com/spps/ahpg.cfm?spgid=6

I could not find anything online other than an Icynene advertisement about what hapens after getting wet. So i will ask Jim.
yea, thats all standard stuff, nothing new there (just another soy variation), - even the closed vs. open debate. USGBC page just has one guys opinion, even states from a roofers perspective that the same decking rot is there freq. with or w/o foam, so i dont see how that is indicative of anything. + it mentions another scenario, "However, when open cell foam is installed without a vapor barrier (which appears to occur often in real-world applications), the foam will absorb the water. As long as it remains wet, the open cell foam could potentially cause rot and mold."
i was more or less wanting to see the state of florida stuff, not manufact. claims

Last edited by ?MEGA; 05-04-2011 at 04:45 PM.
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Old 05-04-2011, 05:44 PM   #14
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That was through my safe Florida home. I'm not sure if I can replicate that unless I find my booklets. If I find them after I take everything out of storage after the move I will get them to you. What they said in the class was the ccf would not let the home breath which would cause mold and rot. That is why after the Florida building code switched to require swr dade county faught it due to the amount of block homes and their lack of being able to breath. They recommended it only be applied on the edges and trusses. It makes sense to me that if water was trapped between 2 vapor barriers it would rot. I trust those engineers which is why I'm going to apply it that way to my Navarre house.
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Old 05-04-2011, 07:10 PM   #15
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didnt my safe florida home shut down June 30, 2009??

i see what you are saying, but on a whole it isnt fact. closed cell is also used in wall and floor cavities, esp off grade homes. there is no mold or rot issues in these due to #2 close cell foam... as for as the attic, you add equal supply and return air to the space, thats how it breathes. although you have added to the amount of cubic volume of air, it more than equals out due to the fact that it is all sealed, with no thermal loss/leaks. i think ace insulation, advanced insulation, coastal insulation, etc would all disagree with you.

i also do, and enjoy the discussion. if your theory is true, and applied i.e only using close cell on the edges, would that just not rot the edges, as water will not permeate 2" of that foam? in essence, you are trapping water between the 2 vapor barriers still, but just on the joints as well as the truss chords.... in my opinion, if i found that theory to be true, i wouldnt use it all. that just doesnt add up.

another thing is trying to get a quote from a company to use a close cell set up to spray edges and trusses (again whats the diff than just spraying the whole area?), then switch over setups and convert to open cell to spray the rest? say an average size roof of 20 squares for R30....
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Old 05-04-2011, 09:21 PM   #16
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The wood would dry. It would not dry as easy if it had foam on one side and shingles on the other. I know MSFH is shut down which is why I have to find my class books and notes. I think we agree on this minus the roof sheathing. I don't think all would disagree. I think it would depend on what they sell. Costal either did mine or bid on it and I think they do ccf for rebuild nw florida. They are also a Icynene dealer so they would be the best to settle our spat/thread hijack. Whats the going rate up there right now for closed and open cell? It's $1.80 to $2.10 here per SF.
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