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matulch 02-01-2013 11:03 AM

Finishing attic insulation plan
 
Here is my insulation plan
use Demilec Heatlok Soy 200 7.4 R value at 1 inch
spray 5.5 in thick for room and 2 in thick for the rest of attic roof.
I am also thinking about adding fiberglass under the 2in foam section of attic.
http://i1310.photobucket.com/albums/...psc17b84fb.jpg

Here is what the space is looking like.

http://i1310.photobucket.com/albums/...pse911d007.jpg

What do you think?

more info about project here
http://www.diychatroom.com/f2/1925-b...164309/index2/

Gary in WA 02-01-2013 01:00 PM

I think the R-7.4 is a little high, and tricky advertising. Most SPF is R-6.5 and yet... Probably how they are meeting the testing requirements. You are aware SPF " ages" and stabilizes for it's R-value? Did you know that brand lists (chart at end), R-26 for 4" = R-6.6 not 7.4, don't be fooled by the sales pitch, or at 10" = R-6.64; http://www.demilecusa.com/wp-content...ok-Soy-200.pdf

Thermal drift in SPF: http://www.kwikbuildpanels.com/pages/article_facts.html

Pages 3-6; http://www.passivehouse.us/passiveHo...ive_Houses.pdf

Buyer beware...your 5-1/2" = R-6.63 per inch for total R-36.5.

Gary

HomeSealed 02-01-2013 01:03 PM

1) I like your hat.
2) I'd prefer to seal and insulate the kneewalls rather than the roof deck in the attic areas, which turns that into conditioned space... That is unless you have a valid reason to not do so? I see that you are planning some sort of built-in unit, so perhaps that is your reasoning?

matulch 02-01-2013 01:20 PM

HomeSealed

The attic does not have any vents or soffit, So I am thinking I should keep it that way and do a unvented Attics.

What do you think? Would I have to add soffits and vents if I don't condition this space?

matulch 02-06-2013 04:11 PM

I calculated 4,100 bf of insulation

Any Idea on what this will cost for CC spray foam?


Thanks,

Chris

HomeSealed 02-06-2013 10:57 PM

Quote:

Originally Posted by matulch (Post 1107220)
HomeSealed

The attic does not have any vents or soffit, So I am thinking I should keep it that way and do a unvented Attics.

What do you think? Would I have to add soffits and vents if I don't condition this space?

It would be best to vent that attic space.


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